fix: add continuation retry limit for truncated diagrams

Previously, continuation mode (for truncated XML) had unlimited client-side
retries, relying only on server stepCountIs(5) limit. This could cause
excessive API calls (495 observed) when XML truncation kept occurring.

Added MAX_CONTINUATION_RETRY_COUNT=2 to limit continuation attempts:
- After 2 failed continuation attempts, shows error toast and stops
- Resets on successful completion or user-initiated message
- Also resets when quota limits are hit

app/api/chat/route.ts

@@ -14,11 +14,6 @@ import path from "path"
 import { z } from "zod"
 import { getAIModel, supportsPromptCaching } from "@/lib/ai-providers"
 import { findCachedResponse } from "@/lib/cached-responses"
-import {
-    checkAndIncrementRequest,
-    isQuotaEnabled,
-    recordTokenUsage,
-} from "@/lib/dynamo-quota-manager"
 import {
     getTelemetryConfig,
     setTraceInput,
@@ -167,13 +162,9 @@ async function handleChatRequest(req: Request): Promise<Response> {
 
     const { messages, xml, previousXml, sessionId } = await req.json()
 
-    // Get user IP for Langfuse tracking (hashed for privacy)
+    // Get user IP for Langfuse tracking
     const forwardedFor = req.headers.get("x-forwarded-for")
-    const rawIp = forwardedFor?.split(",")[0]?.trim() || "anonymous"
+    const userId = forwardedFor?.split(",")[0]?.trim() || "anonymous"
-    const userId =
-        rawIp === "anonymous"
-            ? rawIp
-            : `user-${Buffer.from(rawIp).toString("base64url").slice(0, 8)}`
 
     // Validate sessionId for Langfuse (must be string, max 200 chars)
     const validSessionId =
@@ -196,33 +187,6 @@ async function handleChatRequest(req: Request): Promise<Response> {
         userId: userId,
     })
 
-    // === SERVER-SIDE QUOTA CHECK START ===
-    // Quota is opt-in: only enabled when DYNAMODB_QUOTA_TABLE env var is set
-    const hasOwnApiKey = !!(
-        req.headers.get("x-ai-provider") && req.headers.get("x-ai-api-key")
-    )
-
-    // Skip quota check if: quota disabled, user has own API key, or is anonymous
-    if (isQuotaEnabled() && !hasOwnApiKey && userId !== "anonymous") {
-        const quotaCheck = await checkAndIncrementRequest(userId, {
-            requests: Number(process.env.DAILY_REQUEST_LIMIT) || 10,
-            tokens: Number(process.env.DAILY_TOKEN_LIMIT) || 200000,
-            tpm: Number(process.env.TPM_LIMIT) || 20000,
-        })
-        if (!quotaCheck.allowed) {
-            return Response.json(
-                {
-                    error: quotaCheck.error,
-                    type: quotaCheck.type,
-                    used: quotaCheck.used,
-                    limit: quotaCheck.limit,
-                },
-                { status: 429 },
-            )
-        }
-    }
-    // === SERVER-SIDE QUOTA CHECK END ===
-
     // === FILE VALIDATION START ===
     const fileValidation = validateFileParts(messages)
     if (!fileValidation.valid) {
@@ -542,26 +506,12 @@ ${userInputText}
                 userId,
             }),
         }),
-        onFinish: ({ text, totalUsage }) => {
+        onFinish: ({ text, usage }) => {
-            // AI SDK 6 telemetry auto-reports token usage on its spans
+            // Pass usage to Langfuse (Bedrock streaming doesn't auto-report tokens to telemetry)
-            setTraceOutput(text)
+            setTraceOutput(text, {
-
+                promptTokens: usage?.inputTokens,
-            // Record token usage for server-side quota tracking (if enabled)
+                completionTokens: usage?.outputTokens,
-            // Use totalUsage (cumulative across all steps) instead of usage (final step only)
+            })
-            // Include all 4 token types: input, output, cache read, cache write
-            if (
-                isQuotaEnabled() &&
-                !hasOwnApiKey &&
-                userId !== "anonymous" &&
-                totalUsage
-            ) {
-                const totalTokens =
-                    (totalUsage.inputTokens || 0) +
-                    (totalUsage.outputTokens || 0) +
-                    (totalUsage.cachedInputTokens || 0) +
-                    (totalUsage.inputTokenDetails?.cacheWriteTokens || 0)
-                recordTokenUsage(userId, totalTokens)
-            }
         },
         tools: {
             // Client-side tool that will be executed on the client
@@ -731,9 +681,20 @@ Call this tool to get shape names and usage syntax for a specific library.`,
         messageMetadata: ({ part }) => {
             if (part.type === "finish") {
                 const usage = (part as any).totalUsage
-                // AI SDK 6 provides totalTokens directly
+                if (!usage) {
+                    console.warn(
+                        "[messageMetadata] No usage data in finish part",
+                    )
+                    return undefined
+                }
+                // Total input = non-cached + cached (these are separate counts)
+                // Note: cacheWriteInputTokens is not available on finish part
+                const totalInputTokens =
+                    (usage.inputTokens ?? 0) +
+                    (usage.inputTokenDetails?.cacheReadTokens ?? 0)
                 return {
-                    totalTokens: usage?.totalTokens ?? 0,
+                    inputTokens: totalInputTokens,
+                    outputTokens: usage.outputTokens ?? 0,
                     finishReason: (part as any).finishReason,
                 }
             }

app/api/log-feedback/route.ts

@@ -27,18 +27,9 @@ export async function POST(req: Request) {
 
     const { messageId, feedback, sessionId } = data
 
-    // Skip logging if no sessionId - prevents attaching to wrong user's trace
+    // Get user IP for tracking
-    if (!sessionId) {
-        return Response.json({ success: true, logged: false })
-    }
-
-    // Get user IP for tracking (hashed for privacy)
     const forwardedFor = req.headers.get("x-forwarded-for")
-    const rawIp = forwardedFor?.split(",")[0]?.trim() || "anonymous"
+    const userId = forwardedFor?.split(",")[0]?.trim() || "anonymous"
-    const userId =
-        rawIp === "anonymous"
-            ? rawIp
-            : `user-${Buffer.from(rawIp).toString("base64url").slice(0, 8)}`
 
     try {
         // Find the most recent chat trace for this session to attach the score to

app/api/log-save/route.ts

@@ -27,11 +27,6 @@ export async function POST(req: Request) {
 
     const { filename, format, sessionId } = data
 
-    // Skip logging if no sessionId - prevents attaching to wrong user's trace
-    if (!sessionId) {
-        return Response.json({ success: true, logged: false })
-    }
-
     try {
         const timestamp = new Date().toISOString()
 

app/globals.css

@@ -144,68 +144,6 @@
     --sidebar-ring: oklch(0.7 0.16 265);
 }
 
-/* ============================================
-   REFINED MINIMAL DESIGN SYSTEM
-   ============================================ */
-
-:root {
-    /* Surface layers for depth */
-    --surface-0: oklch(1 0 0);
-    --surface-1: oklch(0.985 0.002 240);
-    --surface-2: oklch(0.97 0.004 240);
-    --surface-elevated: oklch(1 0 0);
-
-    /* Subtle borders */
-    --border-subtle: oklch(0.94 0.008 260);
-    --border-default: oklch(0.91 0.012 260);
-
-    /* Interactive states */
-    --interactive-hover: oklch(0.96 0.015 260);
-    --interactive-active: oklch(0.93 0.02 265);
-
-    /* Success state */
-    --success: oklch(0.65 0.18 145);
-    --success-muted: oklch(0.95 0.03 145);
-
-    /* Animation timing */
-    --duration-fast: 120ms;
-    --duration-normal: 200ms;
-    --duration-slow: 300ms;
-    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
-    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
-    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
-}
-
-.dark {
-    --surface-0: oklch(0.15 0.015 260);
-    --surface-1: oklch(0.18 0.015 260);
-    --surface-2: oklch(0.22 0.015 260);
-    --surface-elevated: oklch(0.25 0.015 260);
-
-    --border-subtle: oklch(0.25 0.012 260);
-    --border-default: oklch(0.3 0.015 260);
-
-    --interactive-hover: oklch(0.25 0.02 265);
-    --interactive-active: oklch(0.3 0.025 270);
-
-    --success: oklch(0.7 0.16 145);
-    --success-muted: oklch(0.25 0.04 145);
-}
-
-/* Expose surface colors to Tailwind */
-@theme inline {
-    --color-surface-0: var(--surface-0);
-    --color-surface-1: var(--surface-1);
-    --color-surface-2: var(--surface-2);
-    --color-surface-elevated: var(--surface-elevated);
-    --color-border-subtle: var(--border-subtle);
-    --color-border-default: var(--border-default);
-    --color-interactive-hover: var(--interactive-hover);
-    --color-interactive-active: var(--interactive-active);
-    --color-success: var(--success);
-    --color-success-muted: var(--success-muted);
-}
-
 @layer base {
     * {
         @apply border-border outline-ring/50;
@@ -319,83 +257,3 @@
     -webkit-text-fill-color: transparent;
     background-clip: text;
 }
-
-/* ============================================
-   REFINED DIALOG STYLES
-   ============================================ */
-
-/* Refined dialog shadow - multi-layer soft shadow */
-.shadow-dialog {
-    box-shadow:
-        0 0 0 1px oklch(0 0 0 / 0.03),
-        0 2px 4px oklch(0 0 0 / 0.02),
-        0 12px 24px oklch(0 0 0 / 0.06),
-        0 24px 48px oklch(0 0 0 / 0.04);
-}
-
-.dark .shadow-dialog {
-    box-shadow:
-        0 0 0 1px oklch(1 0 0 / 0.05),
-        0 2px 4px oklch(0 0 0 / 0.2),
-        0 12px 24px oklch(0 0 0 / 0.3),
-        0 24px 48px oklch(0 0 0 / 0.2);
-}
-
-/* Dialog animations */
-@keyframes dialog-in {
-    from {
-        opacity: 0;
-        transform: translate(-50%, -48%) scale(0.96);
-    }
-    to {
-        opacity: 1;
-        transform: translate(-50%, -50%) scale(1);
-    }
-}
-
-@keyframes dialog-out {
-    from {
-        opacity: 1;
-        transform: translate(-50%, -50%) scale(1);
-    }
-    to {
-        opacity: 0;
-        transform: translate(-50%, -48%) scale(0.96);
-    }
-}
-
-.animate-dialog-in {
-    animation: dialog-in var(--duration-normal) var(--ease-out) forwards;
-}
-
-.animate-dialog-out {
-    animation: dialog-out 150ms var(--ease-out) forwards;
-}
-
-/* Check pop animation for validation success */
-@keyframes check-pop {
-    0% {
-        transform: scale(0.8);
-        opacity: 0;
-    }
-    50% {
-        transform: scale(1.1);
-    }
-    100% {
-        transform: scale(1);
-        opacity: 1;
-    }
-}
-
-.animate-check-pop {
-    animation: check-pop 0.25s var(--ease-spring) forwards;
-}
-
-/* Reduced motion support */
-@media (prefers-reduced-motion: reduce) {
-    .animate-dialog-in,
-    .animate-dialog-out,
-    .animate-check-pop {
-        animation: none;
-    }
-}

components/chat-message-display.tsx

@@ -31,7 +31,6 @@ import { getApiEndpoint } from "@/lib/base-path"
 import {
     applyDiagramOperations,
     convertToLegalXml,
-    extractCompleteMxCells,
     isMxCellXmlComplete,
     replaceNodes,
     validateAndFixXml,
@@ -316,28 +315,12 @@ export function ChatMessageDisplay({
 
     const handleDisplayChart = useCallback(
         (xml: string, showToast = false) => {
-            let currentXml = xml || ""
+            const currentXml = xml || ""
-            const startTime = performance.now()
-
-            // During streaming (showToast=false), extract only complete mxCell elements
-            // This allows progressive rendering even with partial/incomplete trailing XML
-            if (!showToast) {
-                const completeCells = extractCompleteMxCells(currentXml)
-                if (!completeCells) {
-                    return
-                }
-                currentXml = completeCells
-            }
-
             const convertedXml = convertToLegalXml(currentXml)
             if (convertedXml !== previousXML.current) {
                 // Parse and validate XML BEFORE calling replaceNodes
                 const parser = new DOMParser()
-                // Wrap in root element for parsing multiple mxCell elements
+                const testDoc = parser.parseFromString(convertedXml, "text/xml")
-                const testDoc = parser.parseFromString(
-                    `<root>${convertedXml}</root>`,
-                    "text/xml",
-                )
                 const parseError = testDoc.querySelector("parsererror")
 
                 if (parseError) {
@@ -364,22 +347,7 @@ export function ChatMessageDisplay({
                         `<mxfile><diagram name="Page-1" id="page-1"><mxGraphModel><root><mxCell id="0"/><mxCell id="1" parent="0"/></root></mxGraphModel></diagram></mxfile>`
                     const replacedXML = replaceNodes(baseXML, convertedXml)
 
-                    const xmlProcessTime = performance.now() - startTime
+                    // Validate and auto-fix the XML
-
-                    // During streaming (showToast=false), skip heavy validation for lower latency
-                    // The quick DOM parse check above catches malformed XML
-                    // Full validation runs on final output (showToast=true)
-                    if (!showToast) {
-                        previousXML.current = convertedXml
-                        const loadStartTime = performance.now()
-                        onDisplayChart(replacedXML, true)
-                        console.log(
-                            `[Streaming] XML processing: ${xmlProcessTime.toFixed(1)}ms, drawio load: ${(performance.now() - loadStartTime).toFixed(1)}ms`,
-                        )
-                        return
-                    }
-
-                    // Final output: run full validation and auto-fix
                     const validation = validateAndFixXml(replacedXML)
                     if (validation.valid) {
                         previousXML.current = convertedXml
@@ -392,19 +360,18 @@ export function ChatMessageDisplay({
                             )
                         }
                         // Skip validation in loadDiagram since we already validated above
-                        const loadStartTime = performance.now()
                         onDisplayChart(xmlToLoad, true)
-                        console.log(
-                            `[Final] XML processing: ${xmlProcessTime.toFixed(1)}ms, validation+load: ${(performance.now() - loadStartTime).toFixed(1)}ms`,
-                        )
                     } else {
                         console.error(
                             "[ChatMessageDisplay] XML validation failed:",
                             validation.error,
                         )
-                        toast.error(
+                        // Only show toast if this is the final XML (not during streaming)
-                            "Diagram validation failed. Please try regenerating.",
+                        if (showToast) {
-                        )
+                            toast.error(
+                                "Diagram validation failed. Please try regenerating.",
+                            )
+                        }
                     }
                 } catch (error) {
                     console.error(
@@ -636,10 +603,17 @@ export function ChatMessageDisplay({
             }
         })
 
-        // NOTE: Don't cleanup debounce timeouts here!
+        // Cleanup: clear any pending debounce timeout on unmount
-        // The cleanup runs on every re-render (when messages changes),
+        return () => {
-        // which would cancel the timeout before it fires.
+            if (debounceTimeoutRef.current) {
-        // Let the timeouts complete naturally - they're harmless if component unmounts.
+                clearTimeout(debounceTimeoutRef.current)
+                debounceTimeoutRef.current = null
+            }
+            if (editDebounceTimeoutRef.current) {
+                clearTimeout(editDebounceTimeoutRef.current)
+                editDebounceTimeoutRef.current = null
+            }
+        }
     }, [messages, handleDisplayChart, chartXML])
 
     const renderToolPart = (part: ToolPartLike) => {

components/chat-panel.tsx

@@ -27,7 +27,6 @@ import {
     TooltipTrigger,
 } from "@/components/ui/tooltip"
 import { useDiagram } from "@/contexts/diagram-context"
-import { useDiagramToolHandlers } from "@/hooks/use-diagram-tool-handlers"
 import { useDictionary } from "@/hooks/use-dictionary"
 import { getSelectedAIConfig, useModelConfig } from "@/hooks/use-model-config"
 import { getApiEndpoint } from "@/lib/base-path"
@@ -35,9 +34,8 @@ import { findCachedResponse } from "@/lib/cached-responses"
 import { isPdfFile, isTextFile } from "@/lib/pdf-utils"
 import { type FileData, useFileProcessor } from "@/lib/use-file-processor"
 import { useQuotaManager } from "@/lib/use-quota-manager"
-import { formatXML } from "@/lib/utils"
+import { formatXML, isMxCellXmlComplete, wrapWithMxFile } from "@/lib/utils"
 import { ChatMessageDisplay } from "./chat-message-display"
-import { DevXmlSimulator } from "./dev-xml-simulator"
 
 // localStorage keys for persistence
 const STORAGE_MESSAGES_KEY = "next-ai-draw-io-messages"
@@ -78,7 +76,6 @@ interface ChatPanelProps {
 const TOOL_ERROR_STATE = "output-error" as const
 const DEBUG = process.env.NODE_ENV === "development"
 const MAX_AUTO_RETRY_COUNT = 1
-
 const MAX_CONTINUATION_RETRY_COUNT = 2 // Limit for truncation continuation retries
 
 /**
@@ -215,6 +212,9 @@ export default function ChatPanel({
         chartXMLRef.current = chartXML
     }, [chartXML])
 
+    // Ref to hold stop function for use in onToolCall (avoids stale closure)
+    const stopRef = useRef<(() => void) | null>(null)
+
     // Ref to track consecutive auto-retry count (reset on user action)
     const autoRetryCountRef = useRef(0)
     // Ref to track continuation retry count (for truncation handling)
@@ -237,16 +237,6 @@ export default function ChatPanel({
     > | null>(null)
     const LOCAL_STORAGE_DEBOUNCE_MS = 1000 // Save at most once per second
 
-    // Diagram tool handlers (display_diagram, edit_diagram, append_diagram)
-    const { handleToolCall } = useDiagramToolHandlers({
-        partialXmlRef,
-        editDiagramOriginalXmlRef,
-        chartXMLRef,
-        onDisplayChart,
-        onFetchChart,
-        onExport,
-    })
-
     const {
         messages,
         sendMessage,
@@ -259,47 +249,313 @@ export default function ChatPanel({
         transport: new DefaultChatTransport({
             api: getApiEndpoint("/api/chat"),
         }),
-        onToolCall: async ({ toolCall }) => {
+        async onToolCall({ toolCall }) {
-            await handleToolCall({ toolCall }, addToolOutput)
+            if (DEBUG) {
+                console.log(
+                    `[onToolCall] Tool: ${toolCall.toolName}, CallId: ${toolCall.toolCallId}`,
+                )
+            }
+
+            if (toolCall.toolName === "display_diagram") {
+                const { xml } = toolCall.input as { xml: string }
+
+                // DEBUG: Log raw input to diagnose false truncation detection
+                console.log(
+                    "[display_diagram] XML ending (last 100 chars):",
+                    xml.slice(-100),
+                )
+                console.log("[display_diagram] XML length:", xml.length)
+
+                // Check if XML is truncated (incomplete mxCell indicates truncated output)
+                const isTruncated = !isMxCellXmlComplete(xml)
+                console.log("[display_diagram] isTruncated:", isTruncated)
+
+                if (isTruncated) {
+                    // Store the partial XML for continuation via append_diagram
+                    partialXmlRef.current = xml
+
+                    // Tell LLM to use append_diagram to continue
+                    const partialEnding = partialXmlRef.current.slice(-500)
+                    addToolOutput({
+                        tool: "display_diagram",
+                        toolCallId: toolCall.toolCallId,
+                        state: "output-error",
+                        errorText: `Output was truncated due to length limits. Use the append_diagram tool to continue.
+
+Your output ended with:
+\`\`\`
+${partialEnding}
+\`\`\`
+
+NEXT STEP: Call append_diagram with the continuation XML.
+- Do NOT include wrapper tags or root cells (id="0", id="1")
+- Start from EXACTLY where you stopped
+- Complete all remaining mxCell elements`,
+                    })
+                    return
+                }
+
+                // Complete XML received - use it directly
+                // (continuation is now handled via append_diagram tool)
+                const finalXml = xml
+                partialXmlRef.current = "" // Reset any partial from previous truncation
+
+                // Wrap raw XML with full mxfile structure for draw.io
+                const fullXml = wrapWithMxFile(finalXml)
+
+                // loadDiagram validates and returns error if invalid
+                const validationError = onDisplayChart(fullXml)
+
+                if (validationError) {
+                    console.warn(
+                        "[display_diagram] Validation error:",
+                        validationError,
+                    )
+                    // Return error to model - sendAutomaticallyWhen will trigger retry
+                    if (DEBUG) {
+                        console.log(
+                            "[display_diagram] Adding tool output with state: output-error",
+                        )
+                    }
+                    addToolOutput({
+                        tool: "display_diagram",
+                        toolCallId: toolCall.toolCallId,
+                        state: "output-error",
+                        errorText: `${validationError}
+
+Please fix the XML issues and call display_diagram again with corrected XML.
+
+Your failed XML:
+\`\`\`xml
+${finalXml}
+\`\`\``,
+                    })
+                } else {
+                    // Success - diagram will be rendered by chat-message-display
+                    if (DEBUG) {
+                        console.log(
+                            "[display_diagram] Success! Adding tool output with state: output-available",
+                        )
+                    }
+                    addToolOutput({
+                        tool: "display_diagram",
+                        toolCallId: toolCall.toolCallId,
+                        output: "Successfully displayed the diagram.",
+                    })
+                    if (DEBUG) {
+                        console.log(
+                            "[display_diagram] Tool output added. Diagram should be visible now.",
+                        )
+                    }
+                }
+            } else if (toolCall.toolName === "edit_diagram") {
+                const { operations } = toolCall.input as {
+                    operations: Array<{
+                        type: "update" | "add" | "delete"
+                        cell_id: string
+                        new_xml?: string
+                    }>
+                }
+
+                let currentXml = ""
+                try {
+                    // Use the original XML captured during streaming (shared with chat-message-display)
+                    // This ensures we apply operations to the same base XML that streaming used
+                    const originalXml = editDiagramOriginalXmlRef.current.get(
+                        toolCall.toolCallId,
+                    )
+                    if (originalXml) {
+                        currentXml = originalXml
+                    } else {
+                        // Fallback: use chartXML from ref if streaming didn't capture original
+                        const cachedXML = chartXMLRef.current
+                        if (cachedXML) {
+                            currentXml = cachedXML
+                        } else {
+                            // Last resort: export from iframe
+                            currentXml = await onFetchChart(false)
+                        }
+                    }
+
+                    const { applyDiagramOperations } = await import(
+                        "@/lib/utils"
+                    )
+                    const { result: editedXml, errors } =
+                        applyDiagramOperations(currentXml, operations)
+
+                    // Check for operation errors
+                    if (errors.length > 0) {
+                        const errorMessages = errors
+                            .map(
+                                (e) =>
+                                    `- ${e.type} on cell_id="${e.cellId}": ${e.message}`,
+                            )
+                            .join("\n")
+
+                        addToolOutput({
+                            tool: "edit_diagram",
+                            toolCallId: toolCall.toolCallId,
+                            state: "output-error",
+                            errorText: `Some operations failed:\n${errorMessages}
+
+Current diagram XML:
+\`\`\`xml
+${currentXml}
+\`\`\`
+
+Please check the cell IDs and retry.`,
+                        })
+                        // Clean up the shared original XML ref
+                        editDiagramOriginalXmlRef.current.delete(
+                            toolCall.toolCallId,
+                        )
+                        return
+                    }
+
+                    // loadDiagram validates and returns error if invalid
+                    const validationError = onDisplayChart(editedXml)
+                    if (validationError) {
+                        console.warn(
+                            "[edit_diagram] Validation error:",
+                            validationError,
+                        )
+                        addToolOutput({
+                            tool: "edit_diagram",
+                            toolCallId: toolCall.toolCallId,
+                            state: "output-error",
+                            errorText: `Edit produced invalid XML: ${validationError}
+
+Current diagram XML:
+\`\`\`xml
+${currentXml}
+\`\`\`
+
+Please fix the operations to avoid structural issues.`,
+                        })
+                        // Clean up the shared original XML ref
+                        editDiagramOriginalXmlRef.current.delete(
+                            toolCall.toolCallId,
+                        )
+                        return
+                    }
+                    onExport()
+                    addToolOutput({
+                        tool: "edit_diagram",
+                        toolCallId: toolCall.toolCallId,
+                        output: `Successfully applied ${operations.length} operation(s) to the diagram.`,
+                    })
+                    // Clean up the shared original XML ref
+                    editDiagramOriginalXmlRef.current.delete(
+                        toolCall.toolCallId,
+                    )
+                } catch (error) {
+                    console.error("[edit_diagram] Failed:", error)
+
+                    const errorMessage =
+                        error instanceof Error ? error.message : String(error)
+
+                    addToolOutput({
+                        tool: "edit_diagram",
+                        toolCallId: toolCall.toolCallId,
+                        state: "output-error",
+                        errorText: `Edit failed: ${errorMessage}
+
+Current diagram XML:
+\`\`\`xml
+${currentXml || "No XML available"}
+\`\`\`
+
+Please check cell IDs and retry, or use display_diagram to regenerate.`,
+                    })
+                    // Clean up the shared original XML ref even on error
+                    editDiagramOriginalXmlRef.current.delete(
+                        toolCall.toolCallId,
+                    )
+                }
+            } else if (toolCall.toolName === "append_diagram") {
+                const { xml } = toolCall.input as { xml: string }
+
+                // Detect if LLM incorrectly started fresh instead of continuing
+                // LLM should only output bare mxCells now, so wrapper tags indicate error
+                const trimmed = xml.trim()
+                const isFreshStart =
+                    trimmed.startsWith("<mxGraphModel") ||
+                    trimmed.startsWith("<root") ||
+                    trimmed.startsWith("<mxfile") ||
+                    trimmed.startsWith('<mxCell id="0"') ||
+                    trimmed.startsWith('<mxCell id="1"')
+
+                if (isFreshStart) {
+                    addToolOutput({
+                        tool: "append_diagram",
+                        toolCallId: toolCall.toolCallId,
+                        state: "output-error",
+                        errorText: `ERROR: You started fresh with wrapper tags. Do NOT include wrapper tags or root cells (id="0", id="1").
+
+Continue from EXACTLY where the partial ended:
+\`\`\`
+${partialXmlRef.current.slice(-500)}
+\`\`\`
+
+Start your continuation with the NEXT character after where it stopped.`,
+                    })
+                    return
+                }
+
+                // Append to accumulated XML
+                partialXmlRef.current += xml
+
+                // Check if XML is now complete (last mxCell is complete)
+                const isComplete = isMxCellXmlComplete(partialXmlRef.current)
+
+                if (isComplete) {
+                    // Wrap and display the complete diagram
+                    const finalXml = partialXmlRef.current
+                    partialXmlRef.current = "" // Reset
+
+                    const fullXml = wrapWithMxFile(finalXml)
+                    const validationError = onDisplayChart(fullXml)
+
+                    if (validationError) {
+                        addToolOutput({
+                            tool: "append_diagram",
+                            toolCallId: toolCall.toolCallId,
+                            state: "output-error",
+                            errorText: `Validation error after assembly: ${validationError}
+
+Assembled XML:
+\`\`\`xml
+${finalXml.substring(0, 2000)}...
+\`\`\`
+
+Please use display_diagram with corrected XML.`,
+                        })
+                    } else {
+                        addToolOutput({
+                            tool: "append_diagram",
+                            toolCallId: toolCall.toolCallId,
+                            output: "Diagram assembly complete and displayed successfully.",
+                        })
+                    }
+                } else {
+                    // Still incomplete - signal to continue
+                    addToolOutput({
+                        tool: "append_diagram",
+                        toolCallId: toolCall.toolCallId,
+                        state: "output-error",
+                        errorText: `XML still incomplete (mxCell not closed). Call append_diagram again to continue.
+
+Current ending:
+\`\`\`
+${partialXmlRef.current.slice(-500)}
+\`\`\`
+
+Continue from EXACTLY where you stopped.`,
+                    })
+                }
+            }
         },
         onError: (error) => {
-            // Handle server-side quota limit (429 response)
-            // AI SDK puts the full response body in error.message for non-OK responses
-            try {
-                const data = JSON.parse(error.message)
-                if (data.type === "request") {
-                    quotaManager.showQuotaLimitToast(data.used, data.limit)
-                    return
-                }
-                if (data.type === "token") {
-                    quotaManager.showTokenLimitToast(data.used, data.limit)
-                    return
-                }
-                if (data.type === "tpm") {
-                    quotaManager.showTPMLimitToast(data.limit)
-                    return
-                }
-            } catch {
-                // Not JSON, fall through to string matching for backwards compatibility
-            }
-
-            // Fallback to string matching
-            if (error.message.includes("Daily request limit")) {
-                quotaManager.showQuotaLimitToast()
-                return
-            }
-            if (error.message.includes("Daily token limit")) {
-                quotaManager.showTokenLimitToast()
-                return
-            }
-            if (
-                error.message.includes("Rate limit exceeded") ||
-                error.message.includes("tokens per minute")
-            ) {
-                quotaManager.showTPMLimitToast()
-                return
-            }
-
             // Silence access code error in console since it's handled by UI
             if (!error.message.includes("Invalid or missing access code")) {
                 console.error("Chat error:", error)
@@ -376,6 +632,22 @@ export default function ChatPanel({
 
             // DEBUG: Log finish reason to diagnose truncation
             console.log("[onFinish] finishReason:", metadata?.finishReason)
+            console.log("[onFinish] metadata:", metadata)
+
+            if (metadata) {
+                // Use Number.isFinite to guard against NaN (typeof NaN === 'number' is true)
+                const inputTokens = Number.isFinite(metadata.inputTokens)
+                    ? (metadata.inputTokens as number)
+                    : 0
+                const outputTokens = Number.isFinite(metadata.outputTokens)
+                    ? (metadata.outputTokens as number)
+                    : 0
+                const actualTokens = inputTokens + outputTokens
+                if (actualTokens > 0) {
+                    quotaManager.incrementTokenCount(actualTokens)
+                    quotaManager.incrementTPMCount(actualTokens)
+                }
+            }
         },
         sendAutomaticallyWhen: ({ messages }) => {
             const isInContinuationMode = partialXmlRef.current.length > 0
@@ -420,10 +692,32 @@ export default function ChatPanel({
                 autoRetryCountRef.current++
             }
 
+            // Check quota limits before auto-retry
+            const tokenLimitCheck = quotaManager.checkTokenLimit()
+            if (!tokenLimitCheck.allowed) {
+                quotaManager.showTokenLimitToast(tokenLimitCheck.used)
+                autoRetryCountRef.current = 0
+                continuationRetryCountRef.current = 0
+                partialXmlRef.current = ""
+                return false
+            }
+
+            const tpmCheck = quotaManager.checkTPMLimit()
+            if (!tpmCheck.allowed) {
+                quotaManager.showTPMLimitToast()
+                autoRetryCountRef.current = 0
+                continuationRetryCountRef.current = 0
+                partialXmlRef.current = ""
+                return false
+            }
+
             return true
         },
     })
 
+    // Update stopRef so onToolCall can access it
+    stopRef.current = stop
+
     // Ref to track latest messages for unload persistence
     const messagesRef = useRef(messages)
     useEffect(() => {
@@ -633,6 +927,9 @@ export default function ChatPanel({
                 xmlSnapshotsRef.current.set(messageIndex, chartXml)
                 saveXmlSnapshots()
 
+                // Check all quota limits
+                if (!checkAllQuotaLimits()) return
+
                 sendChatMessage(parts, chartXml, previousXml, sessionId)
 
                 // Token count is tracked in onFinish with actual server usage
@@ -710,7 +1007,30 @@ export default function ChatPanel({
         saveXmlSnapshots()
     }
 
-    // Send chat message with headers
+    // Check all quota limits (daily requests, tokens, TPM)
+    const checkAllQuotaLimits = (): boolean => {
+        const limitCheck = quotaManager.checkDailyLimit()
+        if (!limitCheck.allowed) {
+            quotaManager.showQuotaLimitToast()
+            return false
+        }
+
+        const tokenLimitCheck = quotaManager.checkTokenLimit()
+        if (!tokenLimitCheck.allowed) {
+            quotaManager.showTokenLimitToast(tokenLimitCheck.used)
+            return false
+        }
+
+        const tpmCheck = quotaManager.checkTPMLimit()
+        if (!tpmCheck.allowed) {
+            quotaManager.showTPMLimitToast()
+            return false
+        }
+
+        return true
+    }
+
+    // Send chat message with headers and increment quota
     const sendChatMessage = (
         parts: any,
         xml: string,
@@ -760,6 +1080,7 @@ export default function ChatPanel({
                 },
             },
         )
+        quotaManager.incrementRequestCount()
     }
 
     // Process files and append content to user text (handles PDF, text, and optionally images)
@@ -847,8 +1168,13 @@ export default function ChatPanel({
             setMessages(newMessages)
         })
 
+        // Check all quota limits
+        if (!checkAllQuotaLimits()) return
+
         // Now send the message after state is guaranteed to be updated
         sendChatMessage(userParts, savedXml, previousXml, sessionId)
+
+        // Token count is tracked in onFinish with actual server usage
     }
 
     const handleEditMessage = async (messageIndex: number, newText: string) => {
@@ -890,8 +1216,12 @@ export default function ChatPanel({
             setMessages(newMessages)
         })
 
+        // Check all quota limits
+        if (!checkAllQuotaLimits()) return
+
         // Now send the edited message after state is guaranteed to be updated
         sendChatMessage(newParts, savedXml, previousXml, sessionId)
+        // Token count is tracked in onFinish with actual server usage
     }
 
     // Collapsed view (desktop only)
@@ -1041,14 +1371,6 @@ export default function ChatPanel({
                 />
             </main>
 
-            {/* Dev XML Streaming Simulator - only in development */}
-            {DEBUG && (
-                <DevXmlSimulator
-                    setMessages={setMessages}
-                    onDisplayChart={onDisplayChart}
-                />
-            )}
-
             {/* Input */}
             <footer
                 className={`${isMobile ? "p-2" : "p-4"} border-t border-border/50 bg-card/50`}

components/dev-xml-simulator.tsx

@@ -1,350 +0,0 @@
-"use client"
-
-import { useEffect, useRef, useState } from "react"
-import { wrapWithMxFile } from "@/lib/utils"
-
-// Dev XML presets for streaming simulator
-const DEV_XML_PRESETS: Record<string, string> = {
-    "Simple Box": `<mxCell id="2" value="Hello World" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;" vertex="1" parent="1">
-  <mxGeometry x="120" y="100" width="120" height="60" as="geometry"/>
-</mxCell>`,
-    "Two Boxes with Arrow": `<mxCell id="2" value="Start" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;" vertex="1" parent="1">
-  <mxGeometry x="100" y="100" width="100" height="50" as="geometry"/>
-</mxCell>
-<mxCell id="3" value="End" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#f8cecc;strokeColor=#b85450;" vertex="1" parent="1">
-  <mxGeometry x="300" y="100" width="100" height="50" as="geometry"/>
-</mxCell>
-<mxCell id="4" value="" style="endArrow=classic;html=1;" edge="1" parent="1" source="2" target="3">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>`,
-    Flowchart: `<mxCell id="2" value="Start" style="ellipse;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;" vertex="1" parent="1">
-  <mxGeometry x="160" y="40" width="80" height="40" as="geometry"/>
-</mxCell>
-<mxCell id="3" value="Process A" style="rounded=0;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;" vertex="1" parent="1">
-  <mxGeometry x="140" y="120" width="120" height="60" as="geometry"/>
-</mxCell>
-<mxCell id="4" value="Decision" style="rhombus;whiteSpace=wrap;html=1;fillColor=#fff2cc;strokeColor=#d6b656;" vertex="1" parent="1">
-  <mxGeometry x="150" y="220" width="100" height="80" as="geometry"/>
-</mxCell>
-<mxCell id="5" value="Process B" style="rounded=0;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;" vertex="1" parent="1">
-  <mxGeometry x="300" y="230" width="120" height="60" as="geometry"/>
-</mxCell>
-<mxCell id="6" value="End" style="ellipse;whiteSpace=wrap;html=1;fillColor=#f8cecc;strokeColor=#b85450;" vertex="1" parent="1">
-  <mxGeometry x="160" y="340" width="80" height="40" as="geometry"/>
-</mxCell>
-<mxCell id="7" style="endArrow=classic;html=1;" edge="1" parent="1" source="2" target="3">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>
-<mxCell id="8" style="endArrow=classic;html=1;" edge="1" parent="1" source="3" target="4">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>
-<mxCell id="9" value="Yes" style="endArrow=classic;html=1;" edge="1" parent="1" source="4" target="6">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>
-<mxCell id="10" value="No" style="endArrow=classic;html=1;exitX=1;exitY=0.5;exitDx=0;exitDy=0;" edge="1" parent="1" source="4" target="5">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>`,
-    "Truncated (Error Test)": `<mxCell id="2" value="This cell is truncated" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;" vertex="1" parent="1">
-  <mxGeometry x="120" y="100" width="120" height="60" as="geometry"/>
-</mxCell>
-<mxCell id="3" value="Incomplete" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#f8cecc;strokeColor`,
-    "HTML Escape + Cell Truncate": `<mxCell id="2" value="<b>Chain-of-Thought Prompting</b><br/><font size='12'>Eliciting Reasoning in Large Language Models</font>" style="rounded=0;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontSize=16;fontStyle=1;" vertex="1" parent="1">
-  <mxGeometry x="40" y="40" width="720" height="60" as="geometry"/>
-</mxCell>
-<mxCell id="3" value="<b>Problem: LLM Reasoning Limitations</b><br/>• Scaling parameters alone insufficient for logical tasks<br/>• Arithmetic, commonsense, symbolic reasoning challenges<br/>• Standard prompting fails on multi-step problems" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#ffe6cc;strokeColor=#d79b00;" vertex="1" parent="1">
-  <mxGeometry x="40" y="120" width="340" height="120" as="geometry"/>
-</mxCell>
-<mxCell id="4" value="<b>Traditional Approaches</b><br/>1. <b>Finetuning:</b> Expensive, task-specific<br/>2. <b>Standard Few-Shot:</b> Input→Output pairs<br/>   (No explanation of reasoning)" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#fff2cc;strokeColor=#d6b656;" vertex="1" parent="1">
-  <mxGeometry x="420" y="120" width="340" height="120" as="geometry"/>
-</mxCell>
-<mxCell id="5" value="<b>CoT Methodology</b><br/>• Add reasoning steps to few-shot examples<br/>• Natural language intermediate steps<br/>• No parameter updates needed<br/>• Model learns to generate own thought process" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;" vertex="1" parent="1">
-  <mxGeometry x="40" y="260" width="340" height="100" as="geometry"/>
-</mxCell>
-<mxCell id="6" value="<b>Example Comparison</b><br/><b>Standard:</b><br/>Q: Roger has 5 balls. He buys 2 cans of 3 balls. How many?<br/>A: 11.<br/><br/><b>CoT:</b><br/>Q: Roger has 5 balls. He buys 2 cans of 3 balls. How many?<br/>A: Roger started with 5 balls. 2 cans of 3 tennis balls each is 6 tennis balls. 5 + 6 = 11. The answer is 11." style="rounded=1;whiteSpace=wrap;html=1;fillColor=#e1d5e7;strokeColor=#9673a6;" vertex="1" parent="1">
-  <mxGeometry x="420" y="260" width="340" height="140" as="geometry"/>
-</mxCell>
-<mxCell id="7" value="<b>Experimental Models</b><br/>• GPT-3 (175B)<br/>• LaMDA (137B)<br/>• PaLM (540B)<br/>• UL2 (20B)<br/>• Codex" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#f8cecc;strokeColor=#b85450;" vertex="1" parent="1">
-  <mxGeometry x="40" y="380" width="340" height="100" as="geometry"/>
-</mxCell>
-<mxCell id="8" value="<b>Reasoning Domains Tested</b><br/>1. <b>Arithmetic:</b> GSM8K, SVAMP, ASDiv, AQuA, MAWPS<br/>2. <b>Commonsense:</b> CSQA, StrategyQA, Date Understanding, Sports Understanding<br/>3. <b>Symbolic:</b> Last Letter Concatenation, Coin Flip" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#f5f5f5;strokeColor=#666666;" vertex="1" parent="1">
-  <mxGeometry x="420" y="420" width="340" height="100" as="geometry"/>
-</mxCell>
-<mxCell id="9" value="<b>Key Results: Arithmetic</b><br/>• PaLM 540B + CoT: <b>56.9%</b> on GSM8K<br/>   (vs 17.9% standard)<br/>• Surpassed finetuned GPT-3 (55%)<br/>• With calculator: <b>58.6%</b>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;" vertex="1" parent="1">
-  <mxGeometry x="40" y="500" width="220" height="100" as="geometry"/>
-</mxCell>
-<mxCell id="10" value="<b>Key Results: Commonsense</b><br/>• StrategyQA: <b>75.6%</b><br/>   (vs 69.4% SOTA)<br/>• Sports Understanding: <b>95.4%</b><br/>   (vs 84% human)" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;" vertex="1" parent="1">
-  <mxGeometry x="280" y="500" width="220" height="100" as="geometry"/>
-</mxCell>
-<mxCell id="11" value="<b>Key Results: Symbolic</b><br/>• OOD Generalization<br/>• Coin Flip: Trained on 2 flips<br/>   Works on 3-4 flips with CoT<br/>• Standard prompting fails" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;" vertex="1" parent="1">
-  <mxGeometry x="540" y="500" width="220" height="100" as="geometry"/>
-</mxCell>
-<mxCell id="12" value="<b>Emergent Ability of Scale</b><br/>• Small models (&lt;10B): No benefit, often harmful<br/>• Large models (100B+): Reasoning emerges<br/>• CoT gains increase dramatically with scale" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#ffe6cc;strokeColor=#d79b00;" vertex="1" parent="1">
-  <mxGeometry x="40" y="620" width="340" height="80" as="geometry"/>
-</mxCell>
-<mxCell id="13" value="<b>Ablation Studies</b><br/>1. Equation only: Worse than CoT<br/>2. Variable compute (...): No improvement<br/>3. Answer first, then reasoning: Same as baseline<br/>→ Content matters, not just extra tokens" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#fff2cc;strokeColor=#d6b656;" vertex="1" parent="1">
-  <mxGeometry x="420" y="620" width="340" height="80" as="geometry"/>
-</mxCell>
-<mxCell id="14" value="<b>Error Analysis</b><br/>• Semantic understanding errors<br/>• One-step missing errors<br/>• Calculation errors<br/>• Larger models reduce semantic/missing-step errors" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#f8cecc;strokeColor=#b85450;" vertex="1" parent="1">
-  <mxGeometry x="40" y="720" width="340" height="80" as="geometry"/>
-</mxCell>
-<mxCell id="15" value="<b>Conclusion</b><br/>• CoT unlocks reasoning potential<br/>• Simple paradigm: &quot;show your work&quot;<br/>• Emergent capability of large models<br/>• No specialized architecture needed" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;" vertex="1" parent="1">
-  <mxGeometry x="420" y="720" width="340" height="80" as="geometry"/>
-</mxCell>
-<mxCell id="16" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;entryX=0.5;entryY=0;" edge="1" parent="1" source="3" target="5">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>
-<mxCell id="17" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;entryX=0.5;entryY=0;" edge="1" parent="1" source="4" target="6">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>
-<mxCell id="18" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;entryX=0.5;entryY=0;" edge="1" parent="1" source="5" target="7">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>
-<mxCell id="19" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;entryX=0.5;entryY=0;" edge="1" parent="1" source="6" target="8">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>
-<mxCell id="20" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;entryX=0.25;entryY=0;" edge="1" parent="1" source="7" target="9">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>
-<mxCell id="21" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;entryX=0.5;entryY=0;" edge="1" parent="1" source="7" target="10">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>
-<mxCell id="22" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;entryX=0.75;entryY=0;" edge="1" parent="1" source="7" target="11">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>
-<mxCell id="23" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;entryX=0.5;entryY=0;" edge="1" parent="1" source="9" target="12">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>
-<mxCell id="24" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;entryX=0.5;entryY=0;" edge="1" parent="1" source="10" target="13">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>
-<mxCell id="25" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;entryX=0.5;entryY=0;" edge="1" parent="1" source="11" target="14">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>
-<mxCell id="26" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;entryX=0.5;entryY=0;" edge="1" parent="1" source="12" target="15">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>
-<mxCell id="27" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;entryX=0.5;entryY=0;" edge="1" parent="1" source="13" target="15">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>
-<mxCell id="28" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;entryX=0.5;entryY=0;" edge="1" parent="1" source="14" target="15">
-  <mxGeometry relative="1" as="geometry"/>
-</mxCell>`,
-}
-
-interface DevXmlSimulatorProps {
-    setMessages: React.Dispatch<React.SetStateAction<any[]>>
-    onDisplayChart: (xml: string) => void
-}
-
-export function DevXmlSimulator({
-    setMessages,
-    onDisplayChart,
-}: DevXmlSimulatorProps) {
-    const [devXml, setDevXml] = useState("")
-    const [isSimulating, setIsSimulating] = useState(false)
-    const [devIntervalMs, setDevIntervalMs] = useState(1)
-    const [devChunkSize, setDevChunkSize] = useState(10)
-    const devStopRef = useRef(false)
-    const devXmlInitializedRef = useRef(false)
-
-    // Restore dev XML from localStorage on mount (after hydration)
-    useEffect(() => {
-        const saved = localStorage.getItem("dev-xml-simulator")
-        if (saved) setDevXml(saved)
-        devXmlInitializedRef.current = true
-    }, [])
-
-    // Save dev XML to localStorage (only after initial load)
-    useEffect(() => {
-        if (devXmlInitializedRef.current) {
-            localStorage.setItem("dev-xml-simulator", devXml)
-        }
-    }, [devXml])
-
-    const handleDevSimulate = async () => {
-        if (!devXml.trim() || isSimulating) return
-
-        setIsSimulating(true)
-        devStopRef.current = false
-        const toolCallId = `dev-sim-${Date.now()}`
-        const xml = devXml.trim()
-
-        // Add user message and initial assistant message with empty XML
-        const userMsg = {
-            id: `user-${Date.now()}`,
-            role: "user" as const,
-            parts: [
-                {
-                    type: "text" as const,
-                    text: "[Dev] Simulating XML streaming",
-                },
-            ],
-        }
-        const assistantMsg = {
-            id: `assistant-${Date.now()}`,
-            role: "assistant" as const,
-            parts: [
-                {
-                    type: "tool-display_diagram" as const,
-                    toolCallId,
-                    state: "input-streaming" as const,
-                    input: { xml: "" },
-                },
-            ],
-        }
-        setMessages((prev) => [...prev, userMsg, assistantMsg] as any)
-
-        // Stream characters progressively
-        for (let i = 0; i < xml.length; i += devChunkSize) {
-            if (devStopRef.current) {
-                setIsSimulating(false)
-                return
-            }
-
-            const chunk = xml.slice(0, i + devChunkSize)
-
-            setMessages((prev) => {
-                const updated = [...prev]
-                const lastMsg = updated[updated.length - 1] as any
-                if (lastMsg?.role === "assistant" && lastMsg.parts?.[0]) {
-                    lastMsg.parts[0].input = { xml: chunk }
-                }
-                return updated
-            })
-
-            await new Promise((r) => setTimeout(r, devIntervalMs))
-        }
-
-        if (devStopRef.current) {
-            setIsSimulating(false)
-            return
-        }
-
-        // Finalize: set state to output-available
-        setMessages((prev) => {
-            const updated = [...prev]
-            const lastMsg = updated[updated.length - 1] as any
-            if (lastMsg?.role === "assistant" && lastMsg.parts?.[0]) {
-                lastMsg.parts[0].state = "output-available"
-                lastMsg.parts[0].output = "Successfully displayed the diagram."
-                lastMsg.parts[0].input = { xml }
-            }
-            return updated
-        })
-
-        // Display the final diagram
-        const fullXml = wrapWithMxFile(xml)
-        onDisplayChart(fullXml)
-
-        setIsSimulating(false)
-    }
-
-    return (
-        <div className="border-t border-dashed border-orange-500/50 px-4 py-2 bg-orange-50/50 dark:bg-orange-950/30">
-            <details>
-                <summary className="text-xs text-orange-600 dark:text-orange-400 cursor-pointer font-medium">
-                    Dev: XML Streaming Simulator
-                </summary>
-                <div className="mt-2 space-y-2">
-                    <div className="flex items-center gap-2">
-                        <label className="text-xs text-muted-foreground whitespace-nowrap">
-                            Preset:
-                        </label>
-                        <select
-                            onChange={(e) => {
-                                if (e.target.value) {
-                                    setDevXml(DEV_XML_PRESETS[e.target.value])
-                                }
-                            }}
-                            className="flex-1 text-xs p-1 border rounded bg-background"
-                            defaultValue=""
-                        >
-                            <option value="" disabled>
-                                Select a preset...
-                            </option>
-                            {Object.keys(DEV_XML_PRESETS).map((name) => (
-                                <option key={name} value={name}>
-                                    {name}
-                                </option>
-                            ))}
-                        </select>
-                        <button
-                            type="button"
-                            onClick={() => setDevXml("")}
-                            className="px-2 py-1 text-xs text-muted-foreground hover:text-foreground border rounded"
-                        >
-                            Clear
-                        </button>
-                    </div>
-                    <textarea
-                        value={devXml}
-                        onChange={(e) => setDevXml(e.target.value)}
-                        placeholder="Paste mxCell XML here or select a preset..."
-                        className="w-full h-24 text-xs font-mono p-2 border rounded bg-background"
-                    />
-                    <div className="flex items-center gap-4">
-                        <div className="flex items-center gap-2 flex-1">
-                            <label className="text-xs text-muted-foreground whitespace-nowrap">
-                                Interval:
-                            </label>
-                            <input
-                                type="range"
-                                min="1"
-                                max="200"
-                                step="1"
-                                value={devIntervalMs}
-                                onChange={(e) =>
-                                    setDevIntervalMs(Number(e.target.value))
-                                }
-                                className="flex-1 h-1 accent-orange-500"
-                            />
-                            <span className="text-xs text-muted-foreground w-12">
-                                {devIntervalMs}ms
-                            </span>
-                        </div>
-                        <div className="flex items-center gap-2">
-                            <label className="text-xs text-muted-foreground whitespace-nowrap">
-                                Chars:
-                            </label>
-                            <input
-                                type="number"
-                                min="1"
-                                max="100"
-                                value={devChunkSize}
-                                onChange={(e) =>
-                                    setDevChunkSize(
-                                        Math.max(1, Number(e.target.value)),
-                                    )
-                                }
-                                className="w-14 text-xs p-1 border rounded bg-background"
-                            />
-                        </div>
-                    </div>
-                    <div className="flex gap-2">
-                        <button
-                            type="button"
-                            onClick={handleDevSimulate}
-                            disabled={isSimulating || !devXml.trim()}
-                            className="px-3 py-1 text-xs bg-orange-500 text-white rounded hover:bg-orange-600 disabled:opacity-50 disabled:cursor-not-allowed"
-                        >
-                            {isSimulating
-                                ? "Streaming..."
-                                : `Simulate (${devChunkSize} chars/${devIntervalMs}ms)`}
-                        </button>
-                        {isSimulating && (
-                            <button
-                                type="button"
-                                onClick={() => {
-                                    devStopRef.current = true
-                                }}
-                                className="px-3 py-1 text-xs bg-red-500 text-white rounded hover:bg-red-600"
-                            >
-                                Stop
-                            </button>
-                        )}
-                    </div>
-                </div>
-            </details>
-        </div>
-    )
-}

components/model-config-dialog.tsx

@@ -103,40 +103,41 @@ function ProviderLogo({
     )
 }
 
-// Configuration section with title and optional action
+// Reusable validation button component
-function ConfigSection({
+function ValidationButton({
-    title,
+    status,
-    icon: Icon,
+    onClick,
-    action,
+    disabled,
-    children,
+    dict,
 }: {
-    title: string
+    status: ValidationStatus
-    icon: React.ComponentType<{ className?: string }>
+    onClick: () => void
-    action?: React.ReactNode
+    disabled: boolean
-    children: React.ReactNode
+    dict: ReturnType<typeof useDictionary>
 }) {
     return (
-        <div className="space-y-4">
+        <Button
-            <div className="flex items-center justify-between">
+            variant={status === "success" ? "outline" : "default"}
-                <div className="flex items-center gap-2">
+            size="sm"
-                    <Icon className="h-4 w-4 text-muted-foreground" />
+            onClick={onClick}
-                    <span className="text-xs font-medium text-muted-foreground uppercase tracking-wider">
+            disabled={disabled}
-                        {title}
+            className={cn(
-                    </span>
+                "h-9 px-4 min-w-[80px]",
-                </div>
+                status === "success" &&
-                {action}
+                    "text-emerald-600 border-emerald-200 dark:border-emerald-800",
-            </div>
+            )}
-            {children}
+        >
-        </div>
+            {status === "validating" ? (
-    )
+                <Loader2 className="h-4 w-4 animate-spin" />
-}
+            ) : status === "success" ? (
-
+                <>
-// Card wrapper with subtle depth
+                    <Check className="h-4 w-4 mr-1.5" />
-function ConfigCard({ children }: { children: React.ReactNode }) {
+                    {dict.modelConfig.verified}
-    return (
+                </>
-        <div className="rounded-2xl border border-border-subtle bg-surface-2/50 p-5 space-y-5">
+            ) : (
-            {children}
+                dict.modelConfig.test
-        </div>
+            )}
+        </Button>
     )
 }
 
@@ -153,6 +154,7 @@ export function ModelConfigDialog({
     const [validationStatus, setValidationStatus] =
         useState<ValidationStatus>("idle")
     const [validationError, setValidationError] = useState<string>("")
+    const [scrollState, setScrollState] = useState({ top: false, bottom: true })
     const [customModelInput, setCustomModelInput] = useState("")
     const scrollRef = useRef<HTMLDivElement>(null)
     const validationResetTimeoutRef = useRef<ReturnType<
@@ -184,6 +186,26 @@ export function ModelConfigDialog({
         (p) => p.id === selectedProviderId,
     )
 
+    // Track scroll position for gradient shadows
+    useEffect(() => {
+        const scrollEl = scrollRef.current?.querySelector(
+            "[data-radix-scroll-area-viewport]",
+        ) as HTMLElement | null
+        if (!scrollEl) return
+
+        const handleScroll = () => {
+            const { scrollTop, scrollHeight, clientHeight } = scrollEl
+            setScrollState({
+                top: scrollTop > 10,
+                bottom: scrollTop < scrollHeight - clientHeight - 10,
+            })
+        }
+
+        handleScroll() // Initial check
+        scrollEl.addEventListener("scroll", handleScroll)
+        return () => scrollEl.removeEventListener("scroll", handleScroll)
+    }, [selectedProvider])
+
     // Cleanup validation reset timeout on unmount
     useEffect(() => {
         return () => {
@@ -368,35 +390,34 @@ export function ModelConfigDialog({
 
     return (
         <Dialog open={open} onOpenChange={onOpenChange}>
-            <DialogContent className="sm:max-w-4xl h-[80vh] max-h-[800px] overflow-hidden flex flex-col gap-0 p-0">
+            <DialogContent className="sm:max-w-3xl h-[75vh] max-h-[700px] overflow-hidden flex flex-col gap-0 p-0">
-                {/* Header */}
+                <DialogHeader className="px-6 pt-6 pb-4 border-b bg-gradient-to-r from-primary/5 via-primary/3 to-transparent">
-                <DialogHeader className="px-6 pt-6 pb-4 shrink-0">
+                    <DialogTitle className="flex items-center gap-2.5 text-xl font-semibold">
-                    <DialogTitle className="flex items-center gap-3">
+                        <div className="p-1.5 rounded-lg bg-primary/10">
-                        <div className="p-2 rounded-xl bg-surface-2">
                             <Server className="h-5 w-5 text-primary" />
                         </div>
                         {dict.modelConfig?.title || "AI Model Configuration"}
                     </DialogTitle>
-                    <DialogDescription className="mt-1">
+                    <DialogDescription className="text-sm">
                         {dict.modelConfig?.description ||
                             "Configure multiple AI providers and models for your workspace"}
                     </DialogDescription>
                 </DialogHeader>
 
-                <div className="flex flex-1 min-h-0 overflow-hidden border-t border-border-subtle">
+                <div className="flex flex-1 min-h-0 overflow-hidden">
                     {/* Provider List (Left Sidebar) */}
-                    <div className="w-60 shrink-0 flex flex-col bg-surface-1/50 border-r border-border-subtle">
+                    <div className="w-56 flex-shrink-0 flex flex-col border-r bg-muted/20">
-                        <div className="px-4 py-3">
+                        <div className="px-4 py-3 border-b">
                             <span className="text-xs font-medium text-muted-foreground uppercase tracking-wider">
                                 {dict.modelConfig.providers}
                             </span>
                         </div>
 
-                        <ScrollArea className="flex-1 px-2">
+                        <ScrollArea className="flex-1">
-                            <div className="space-y-1 pb-2">
+                            <div className="p-2">
                                 {config.providers.length === 0 ? (
                                     <div className="px-3 py-8 text-center">
-                                        <div className="inline-flex items-center justify-center w-10 h-10 rounded-full bg-surface-2 mb-3">
+                                        <div className="inline-flex items-center justify-center w-10 h-10 rounded-full bg-muted mb-3">
                                             <Plus className="h-5 w-5 text-muted-foreground" />
                                         </div>
                                         <p className="text-xs text-muted-foreground">
@@ -404,78 +425,67 @@ export function ModelConfigDialog({
                                         </p>
                                     </div>
                                 ) : (
-                                    config.providers.map((provider) => (
+                                    <div className="flex flex-col gap-1">
-                                        <button
+                                        {config.providers.map((provider) => (
-                                            key={provider.id}
+                                            <button
-                                            type="button"
+                                                key={provider.id}
-                                            onClick={() => {
+                                                type="button"
-                                                setSelectedProviderId(
+                                                onClick={() => {
-                                                    provider.id,
+                                                    setSelectedProviderId(
-                                                )
+                                                        provider.id,
-                                                setValidationStatus(
+                                                    )
-                                                    provider.validated
+                                                    setValidationStatus(
-                                                        ? "success"
+                                                        provider.validated
-                                                        : "idle",
+                                                            ? "success"
-                                                )
+                                                            : "idle",
-                                                setShowApiKey(false)
+                                                    )
-                                            }}
+                                                    setShowApiKey(false)
-                                            className={cn(
+                                                }}
-                                                "group flex items-center gap-3 px-3 py-2.5 rounded-xl w-full",
-                                                "text-left text-sm transition-all duration-150",
-                                                "hover:bg-interactive-hover",
-                                                "focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2",
-                                                selectedProviderId ===
-                                                    provider.id &&
-                                                    "bg-surface-0 shadow-sm ring-1 ring-border-subtle",
-                                            )}
-                                        >
-                                            <div
                                                 className={cn(
-                                                    "w-8 h-8 rounded-lg flex items-center justify-center",
+                                                    "group flex items-center gap-3 px-3 py-2.5 rounded-lg text-left text-sm transition-all duration-150 hover:bg-accent focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2",
-                                                    "bg-surface-2 transition-colors duration-150",
                                                     selectedProviderId ===
                                                         provider.id &&
-                                                        "bg-primary/10",
+                                                        "bg-background shadow-sm ring-1 ring-border",
                                                 )}
                                             >
                                                 <ProviderLogo
                                                     provider={provider.provider}
                                                     className="flex-shrink-0"
                                                 />
-                                            </div>
+                                                <span className="flex-1 truncate font-medium">
-                                            <span className="flex-1 truncate font-medium">
+                                                    {getProviderDisplayName(
-                                                {getProviderDisplayName(
+                                                        provider,
-                                                    provider,
-                                                )}
-                                            </span>
-                                            {provider.validated ? (
-                                                <div className="flex-shrink-0 flex items-center justify-center w-5 h-5 rounded-full bg-success-muted">
-                                                    <Check className="h-3 w-3 text-success" />
-                                                </div>
-                                            ) : (
-                                                <ChevronRight
-                                                    className={cn(
-                                                        "h-4 w-4 text-muted-foreground/50 transition-transform duration-150",
-                                                        selectedProviderId ===
-                                                            provider.id &&
-                                                            "translate-x-0.5",
                                                     )}
-                                                />
+                                                </span>
-                                            )}
+                                                {provider.validated ? (
-                                        </button>
+                                                    <div className="flex-shrink-0 flex items-center justify-center w-5 h-5 rounded-full bg-emerald-500/10">
-                                    ))
+                                                        <Check className="h-3 w-3 text-emerald-500" />
+                                                    </div>
+                                                ) : (
+                                                    <ChevronRight
+                                                        className={cn(
+                                                            "h-4 w-4 text-muted-foreground/50 transition-transform",
+                                                            selectedProviderId ===
+                                                                provider.id &&
+                                                                "translate-x-0.5",
+                                                        )}
+                                                    />
+                                                )}
+                                            </button>
+                                        ))}
+                                    </div>
                                 )}
                             </div>
                         </ScrollArea>
 
                         {/* Add Provider */}
-                        <div className="p-3 border-t border-border-subtle">
+                        <div className="p-2 border-t">
                             <Select
                                 onValueChange={(v) =>
                                     handleAddProvider(v as ProviderName)
                                 }
                             >
-                                <SelectTrigger className="w-full h-9 rounded-xl bg-surface-0 border-border-subtle hover:bg-interactive-hover">
+                                <SelectTrigger className="h-9 bg-background hover:bg-accent">
                                     <Plus className="h-4 w-4 mr-2 text-muted-foreground" />
                                     <SelectValue
                                         placeholder={
@@ -504,23 +514,41 @@ export function ModelConfigDialog({
                     </div>
 
                     {/* Provider Details (Right Panel) */}
-                    <div className="flex-1 min-w-0 flex flex-col overflow-hidden">
+                    <div className="flex-1 min-w-0 overflow-hidden relative">
                         {selectedProvider ? (
                             <>
-                                <ScrollArea className="flex-1" ref={scrollRef}>
+                                {/* Top gradient shadow */}
-                                    <div className="p-6 space-y-8">
+                                <div
+                                    className={cn(
+                                        "absolute top-0 left-0 right-0 h-8 bg-gradient-to-b from-background to-transparent z-10 pointer-events-none transition-opacity duration-200",
+                                        scrollState.top
+                                            ? "opacity-100"
+                                            : "opacity-0",
+                                    )}
+                                />
+                                {/* Bottom gradient shadow */}
+                                <div
+                                    className={cn(
+                                        "absolute bottom-0 left-0 right-0 h-8 bg-gradient-to-t from-background to-transparent z-10 pointer-events-none transition-opacity duration-200",
+                                        scrollState.bottom
+                                            ? "opacity-100"
+                                            : "opacity-0",
+                                    )}
+                                />
+                                <ScrollArea className="h-full" ref={scrollRef}>
+                                    <div className="p-6 space-y-6">
                                         {/* Provider Header */}
                                         <div className="flex items-center gap-3">
-                                            <div className="flex items-center justify-center w-12 h-12 rounded-xl bg-surface-2">
+                                            <div className="flex items-center justify-center w-10 h-10 rounded-lg bg-muted">
                                                 <ProviderLogo
                                                     provider={
                                                         selectedProvider.provider
                                                     }
-                                                    className="h-6 w-6"
+                                                    className="h-5 w-5"
                                                 />
                                             </div>
                                             <div className="flex-1 min-w-0">
-                                                <h3 className="font-semibold text-lg tracking-tight">
+                                                <h3 className="font-semibold text-base">
                                                     {
                                                         PROVIDER_INFO[
                                                             selectedProvider
@@ -528,7 +556,7 @@ export function ModelConfigDialog({
                                                         ].label
                                                     }
                                                 </h3>
-                                                <p className="text-sm text-muted-foreground">
+                                                <p className="text-xs text-muted-foreground">
                                                     {selectedProvider.models
                                                         .length === 0
                                                         ? dict.modelConfig
@@ -545,8 +573,8 @@ export function ModelConfigDialog({
                                                 </p>
                                             </div>
                                             {selectedProvider.validated && (
-                                                <div className="flex items-center gap-1.5 px-3 py-1.5 rounded-full bg-success-muted text-success">
+                                                <div className="flex items-center gap-1.5 px-2.5 py-1 rounded-full bg-emerald-500/10 text-emerald-600 dark:text-emerald-400">
-                                                    <Check className="h-3.5 w-3.5 animate-check-pop" />
+                                                    <Check className="h-3.5 w-3.5" />
                                                     <span className="text-xs font-medium">
                                                         {
                                                             dict.modelConfig
@@ -558,13 +586,18 @@ export function ModelConfigDialog({
                                         </div>
 
                                         {/* Configuration Section */}
-                                        <ConfigSection
+                                        <div className="space-y-4">
-                                            title={
+                                            <div className="flex items-center gap-2 text-sm font-medium text-muted-foreground">
-                                                dict.modelConfig.configuration
+                                                <Settings2 className="h-4 w-4" />
-                                            }
+                                                <span>
-                                            icon={Settings2}
+                                                    {
-                                        >
+                                                        dict.modelConfig
-                                            <ConfigCard>
+                                                            .configuration
+                                                    }
+                                                </span>
+                                            </div>
+
+                                            <div className="rounded-xl border bg-card p-4 space-y-4">
                                                 {/* Display Name */}
                                                 <div className="space-y-2">
                                                     <Label
@@ -823,7 +856,7 @@ export function ModelConfigDialog({
                                                                     "h-9 px-4",
                                                                     validationStatus ===
                                                                         "success" &&
-                                                                        "text-success border-success/30 bg-success-muted hover:bg-success-muted",
+                                                                        "text-emerald-600 border-emerald-200 dark:border-emerald-800",
                                                                 )}
                                                             >
                                                                 {validationStatus ===
@@ -832,7 +865,7 @@ export function ModelConfigDialog({
                                                                 ) : validationStatus ===
                                                                   "success" ? (
                                                                     <>
-                                                                        <Check className="h-4 w-4 mr-1.5 animate-check-pop" />
+                                                                        <Check className="h-4 w-4 mr-1.5" />
                                                                         {
                                                                             dict
                                                                                 .modelConfig
@@ -942,7 +975,7 @@ export function ModelConfigDialog({
                                                                         "h-9 px-4",
                                                                         validationStatus ===
                                                                             "success" &&
-                                                                            "text-success border-success/30 bg-success-muted hover:bg-success-muted",
+                                                                            "text-emerald-600 border-emerald-200 dark:border-emerald-800",
                                                                     )}
                                                                 >
                                                                     {validationStatus ===
@@ -951,7 +984,7 @@ export function ModelConfigDialog({
                                                                     ) : validationStatus ===
                                                                       "success" ? (
                                                                         <>
-                                                                            <Check className="h-4 w-4 mr-1.5 animate-check-pop" />
+                                                                            <Check className="h-4 w-4 mr-1.5" />
                                                                             {
                                                                                 dict
                                                                                     .modelConfig
@@ -1020,19 +1053,26 @@ export function ModelConfigDialog({
                                                                         .modelConfig
                                                                         .customEndpoint
                                                                 }
-                                                                className="h-9 rounded-xl font-mono text-xs"
+                                                                className="h-9 font-mono text-xs"
                                                             />
                                                         </div>
                                                     </>
                                                 )}
-                                            </ConfigCard>
+                                            </div>
-                                        </ConfigSection>
+                                        </div>
 
                                         {/* Models Section */}
-                                        <ConfigSection
+                                        <div className="space-y-4">
-                                            title={dict.modelConfig.models}
+                                            <div className="flex items-center justify-between">
-                                            icon={Sparkles}
+                                                <div className="flex items-center gap-2 text-sm font-medium text-muted-foreground">
-                                            action={
+                                                    <Sparkles className="h-4 w-4" />
+                                                    <span>
+                                                        {
+                                                            dict.modelConfig
+                                                                .models
+                                                        }
+                                                    </span>
+                                                </div>
                                                 <div className="flex items-center gap-2">
                                                     <div className="relative">
                                                         <Input
@@ -1048,6 +1088,7 @@ export function ModelConfigDialog({
                                                                     e.target
                                                                         .value,
                                                                 )
+                                                                // Clear duplicate error when typing
                                                                 if (
                                                                     duplicateError
                                                                 ) {
@@ -1076,11 +1117,12 @@ export function ModelConfigDialog({
                                                                 }
                                                             }}
                                                             className={cn(
-                                                                "h-8 w-44 rounded-lg font-mono text-xs",
+                                                                "h-8 w-48 font-mono text-xs",
                                                                 duplicateError &&
                                                                     "border-destructive focus-visible:ring-destructive",
                                                             )}
                                                         />
+                                                        {/* Show duplicate error for custom model input */}
                                                         {duplicateError && (
                                                             <p className="absolute top-full left-0 mt-1 text-[11px] text-destructive">
                                                                 {duplicateError}
@@ -1090,7 +1132,7 @@ export function ModelConfigDialog({
                                                     <Button
                                                         variant="outline"
                                                         size="sm"
-                                                        className="h-8 rounded-lg"
+                                                        className="h-8"
                                                         onClick={() => {
                                                             if (
                                                                 customModelInput.trim()
@@ -1127,7 +1169,7 @@ export function ModelConfigDialog({
                                                             0
                                                         }
                                                     >
-                                                        <SelectTrigger className="w-28 h-8 rounded-lg hover:bg-interactive-hover">
+                                                        <SelectTrigger className="w-32 h-8 hover:bg-accent">
                                                             <span className="text-xs">
                                                                 {availableSuggestions.length ===
                                                                 0
@@ -1160,14 +1202,14 @@ export function ModelConfigDialog({
                                                         </SelectContent>
                                                     </Select>
                                                 </div>
-                                            }
+                                            </div>
-                                        >
+
                                             {/* Model List */}
-                                            <div className="rounded-2xl border border-border-subtle bg-surface-2/30 overflow-hidden min-h-[120px]">
+                                            <div className="rounded-xl border bg-card overflow-hidden min-h-[120px]">
                                                 {selectedProvider.models
                                                     .length === 0 ? (
-                                                    <div className="p-6 text-center h-full flex flex-col items-center justify-center">
+                                                    <div className="p-4 text-center h-full flex flex-col items-center justify-center">
-                                                        <div className="inline-flex items-center justify-center w-10 h-10 rounded-full bg-surface-2 mb-3">
+                                                        <div className="inline-flex items-center justify-center w-10 h-10 rounded-full bg-muted mb-2">
                                                             <Sparkles className="h-5 w-5 text-muted-foreground" />
                                                         </div>
                                                         <p className="text-sm text-muted-foreground">
@@ -1178,7 +1220,7 @@ export function ModelConfigDialog({
                                                         </p>
                                                     </div>
                                                 ) : (
-                                                    <div className="divide-y divide-border-subtle">
+                                                    <div className="divide-y">
                                                         {selectedProvider.models.map(
                                                             (model, index) => (
                                                                 <div
@@ -1186,7 +1228,16 @@ export function ModelConfigDialog({
                                                                         model.id
                                                                     }
                                                                     className={cn(
-                                                                        "transition-colors duration-150 hover:bg-interactive-hover/50",
+                                                                        "transition-colors hover:bg-muted/30",
+                                                                        index ===
+                                                                            0 &&
+                                                                            "rounded-t-xl",
+                                                                        index ===
+                                                                            selectedProvider
+                                                                                .models
+                                                                                .length -
+                                                                                1 &&
+                                                                            "rounded-b-xl",
                                                                     )}
                                                                 >
                                                                     <div className="flex items-center gap-3 p-3 min-w-0">
@@ -1213,8 +1264,8 @@ export function ModelConfigDialog({
                                                                             ) : model.validated ===
                                                                               true ? (
                                                                                 // Valid
-                                                                                <div className="w-full h-full rounded-lg bg-success-muted flex items-center justify-center">
+                                                                                <div className="w-full h-full rounded-lg bg-emerald-500/10 flex items-center justify-center">
-                                                                                    <Check className="h-4 w-4 text-success" />
+                                                                                    <Check className="h-4 w-4 text-emerald-500" />
                                                                                 </div>
                                                                             ) : model.validated ===
                                                                               false ? (
@@ -1415,7 +1466,7 @@ export function ModelConfigDialog({
                                                     </div>
                                                 )}
                                             </div>
-                                        </ConfigSection>
+                                        </div>
 
                                         {/* Danger Zone */}
                                         <div className="pt-4">
@@ -1425,7 +1476,7 @@ export function ModelConfigDialog({
                                                 onClick={() =>
                                                     setDeleteConfirmOpen(true)
                                                 }
-                                                className="text-muted-foreground hover:text-destructive hover:bg-destructive/5 rounded-xl"
+                                                className="text-muted-foreground hover:text-destructive hover:bg-destructive/10"
                                             >
                                                 <Trash2 className="h-4 w-4 mr-2" />
                                                 {
@@ -1439,10 +1490,10 @@ export function ModelConfigDialog({
                             </>
                         ) : (
                             <div className="h-full flex flex-col items-center justify-center p-8 text-center">
-                                <div className="inline-flex items-center justify-center w-16 h-16 rounded-2xl bg-surface-2 mb-4">
+                                <div className="inline-flex items-center justify-center w-16 h-16 rounded-2xl bg-gradient-to-br from-primary/10 to-primary/5 mb-4">
-                                    <Server className="h-8 w-8 text-muted-foreground" />
+                                    <Server className="h-8 w-8 text-primary/60" />
                                 </div>
-                                <h3 className="font-semibold text-lg tracking-tight mb-1">
+                                <h3 className="font-semibold mb-1">
                                     {dict.modelConfig.configureProviders}
                                 </h3>
                                 <p className="text-sm text-muted-foreground max-w-xs">
@@ -1454,7 +1505,7 @@ export function ModelConfigDialog({
                 </div>
 
                 {/* Footer */}
-                <div className="px-6 py-3 border-t border-border-subtle bg-surface-1/30 shrink-0">
+                <div className="px-6 py-3 border-t bg-muted/20">
                     <p className="text-xs text-muted-foreground text-center flex items-center justify-center gap-1.5">
                         <Key className="h-3 w-3" />
                         {dict.modelConfig.apiKeyStored}

components/settings-dialog.tsx

@@ -24,32 +24,6 @@ import { Switch } from "@/components/ui/switch"
 import { useDictionary } from "@/hooks/use-dictionary"
 import { getApiEndpoint } from "@/lib/base-path"
 import { i18n, type Locale } from "@/lib/i18n/config"
-import { cn } from "@/lib/utils"
-
-// Reusable setting item component for consistent layout
-function SettingItem({
-    label,
-    description,
-    children,
-}: {
-    label: string
-    description?: string
-    children: React.ReactNode
-}) {
-    return (
-        <div className="flex items-center justify-between py-4 first:pt-0 last:pb-0">
-            <div className="space-y-0.5 pr-4">
-                <Label className="text-sm font-medium">{label}</Label>
-                {description && (
-                    <p className="text-xs text-muted-foreground max-w-[260px]">
-                        {description}
-                    </p>
-                )}
-            </div>
-            <div className="shrink-0">{children}</div>
-        </div>
-    )
-}
 
 const LANGUAGE_LABELS: Record<Locale, string> = {
     en: "English",
@@ -203,154 +177,145 @@ function SettingsContent({
     }
 
     return (
-        <DialogContent className="sm:max-w-lg p-0 gap-0">
+        <DialogContent className="sm:max-w-md">
-            {/* Header */}
+            <DialogHeader>
-            <DialogHeader className="px-6 pt-6 pb-4">
                 <DialogTitle>{dict.settings.title}</DialogTitle>
-                <DialogDescription className="mt-1">
+                <DialogDescription>
                     {dict.settings.description}
                 </DialogDescription>
             </DialogHeader>
-
+            <div className="space-y-4 py-2">
-            {/* Content */}
+                {accessCodeRequired && (
-            <div className="px-6 pb-6">
+                    <div className="space-y-2">
-                <div className="divide-y divide-border-subtle">
+                        <Label htmlFor="access-code">
-                    {/* Access Code (conditional) */}
+                            {dict.settings.accessCode}
-                    {accessCodeRequired && (
+                        </Label>
-                        <div className="py-4 first:pt-0 space-y-3">
+                        <div className="flex gap-2">
-                            <div className="space-y-0.5">
+                            <Input
-                                <Label
+                                id="access-code"
-                                    htmlFor="access-code"
+                                type="password"
-                                    className="text-sm font-medium"
+                                value={accessCode}
-                                >
+                                onChange={(e) => setAccessCode(e.target.value)}
-                                    {dict.settings.accessCode}
+                                onKeyDown={handleKeyDown}
-                                </Label>
+                                placeholder={
-                                <p className="text-xs text-muted-foreground">
+                                    dict.settings.accessCodePlaceholder
-                                    {dict.settings.accessCodeDescription}
+                                }
-                                </p>
+                                autoComplete="off"
-                            </div>
+                            />
-                            <div className="flex gap-2">
+                            <Button
-                                <Input
+                                onClick={handleSave}
-                                    id="access-code"
+                                disabled={isVerifying || !accessCode.trim()}
-                                    type="password"
-                                    value={accessCode}
-                                    onChange={(e) =>
-                                        setAccessCode(e.target.value)
-                                    }
-                                    onKeyDown={handleKeyDown}
-                                    placeholder={
-                                        dict.settings.accessCodePlaceholder
-                                    }
-                                    autoComplete="off"
-                                    className="h-9"
-                                />
-                                <Button
-                                    onClick={handleSave}
-                                    disabled={isVerifying || !accessCode.trim()}
-                                    className="h-9 px-4 rounded-xl"
-                                >
-                                    {isVerifying ? "..." : dict.common.save}
-                                </Button>
-                            </div>
-                            {error && (
-                                <p className="text-xs text-destructive">
-                                    {error}
-                                </p>
-                            )}
-                        </div>
-                    )}
-
-                    {/* Language */}
-                    <SettingItem
-                        label={dict.settings.language}
-                        description={dict.settings.languageDescription}
-                    >
-                        <Select
-                            value={currentLang}
-                            onValueChange={changeLanguage}
-                        >
-                            <SelectTrigger
-                                id="language-select"
-                                className="w-[120px] h-9 rounded-xl"
                             >
-                                <SelectValue />
+                                {isVerifying ? "..." : dict.common.save}
-                            </SelectTrigger>
+                            </Button>
-                            <SelectContent>
+                        </div>
-                                {i18n.locales.map((locale) => (
+                        <p className="text-[0.8rem] text-muted-foreground">
-                                    <SelectItem key={locale} value={locale}>
+                            {dict.settings.accessCodeDescription}
-                                        {LANGUAGE_LABELS[locale]}
+                        </p>
-                                    </SelectItem>
+                        {error && (
-                                ))}
+                            <p className="text-[0.8rem] text-destructive">
-                            </SelectContent>
+                                {error}
-                        </Select>
+                            </p>
-                    </SettingItem>
+                        )}
+                    </div>
+                )}
 
-                    {/* Theme */}
+                <div className="flex items-center justify-between">
-                    <SettingItem
+                    <div className="space-y-0.5">
-                        label={dict.settings.theme}
+                        <Label htmlFor="language-select">
-                        description={dict.settings.themeDescription}
+                            {dict.settings.language}
-                    >
+                        </Label>
-                        <Button
+                        <p className="text-[0.8rem] text-muted-foreground">
-                            id="theme-toggle"
+                            {dict.settings.languageDescription}
-                            variant="outline"
+                        </p>
-                            size="icon"
+                    </div>
-                            onClick={onToggleDarkMode}
+                    <Select value={currentLang} onValueChange={changeLanguage}>
-                            className="h-9 w-9 rounded-xl border-border-subtle hover:bg-interactive-hover"
+                        <SelectTrigger id="language-select" className="w-32">
-                        >
+                            <SelectValue />
-                            {darkMode ? (
+                        </SelectTrigger>
-                                <Sun className="h-4 w-4" />
+                        <SelectContent>
-                            ) : (
+                            {i18n.locales.map((locale) => (
-                                <Moon className="h-4 w-4" />
+                                <SelectItem key={locale} value={locale}>
-                            )}
+                                    {LANGUAGE_LABELS[locale]}
-                        </Button>
+                                </SelectItem>
-                    </SettingItem>
+                            ))}
+                        </SelectContent>
+                    </Select>
+                </div>
 
-                    {/* Draw.io Style */}
+                <div className="flex items-center justify-between">
-                    <SettingItem
+                    <div className="space-y-0.5">
-                        label={dict.settings.drawioStyle}
+                        <Label htmlFor="theme-toggle">
-                        description={`${dict.settings.drawioStyleDescription} ${
+                            {dict.settings.theme}
-                            drawioUi === "min"
+                        </Label>
-                                ? dict.settings.minimal
+                        <p className="text-[0.8rem] text-muted-foreground">
-                                : dict.settings.sketch
+                            {dict.settings.themeDescription}
-                        }`}
+                        </p>
+                    </div>
+                    <Button
+                        id="theme-toggle"
+                        variant="outline"
+                        size="icon"
+                        onClick={onToggleDarkMode}
                     >
-                        <Button
+                        {darkMode ? (
-                            id="drawio-ui"
+                            <Sun className="h-4 w-4" />
-                            variant="outline"
+                        ) : (
-                            onClick={onToggleDrawioUi}
+                            <Moon className="h-4 w-4" />
-                            className="h-9 w-[120px] rounded-xl border-border-subtle hover:bg-interactive-hover font-normal"
+                        )}
-                        >
+                    </Button>
-                            {dict.settings.switchTo}{" "}
+                </div>
+
+                <div className="flex items-center justify-between">
+                    <div className="space-y-0.5">
+                        <Label htmlFor="drawio-ui">
+                            {dict.settings.drawioStyle}
+                        </Label>
+                        <p className="text-[0.8rem] text-muted-foreground">
+                            {dict.settings.drawioStyleDescription}{" "}
                             {drawioUi === "min"
-                                ? dict.settings.sketch
+                                ? dict.settings.minimal
-                                : dict.settings.minimal}
+                                : dict.settings.sketch}
-                        </Button>
+                        </p>
-                    </SettingItem>
+                    </div>
-
+                    <Button
-                    {/* Close Protection */}
+                        id="drawio-ui"
-                    <SettingItem
+                        variant="outline"
-                        label={dict.settings.closeProtection}
+                        size="sm"
-                        description={dict.settings.closeProtectionDescription}
+                        onClick={onToggleDrawioUi}
                     >
-                        <Switch
+                        {dict.settings.switchTo}{" "}
-                            id="close-protection"
+                        {drawioUi === "min"
-                            checked={closeProtection}
+                            ? dict.settings.sketch
-                            onCheckedChange={(checked) => {
+                            : dict.settings.minimal}
-                                setCloseProtection(checked)
+                    </Button>
-                                localStorage.setItem(
+                </div>
-                                    STORAGE_CLOSE_PROTECTION_KEY,
+
-                                    checked.toString(),
+                <div className="flex items-center justify-between">
-                                )
+                    <div className="space-y-0.5">
-                                onCloseProtectionChange?.(checked)
+                        <Label htmlFor="close-protection">
-                            }}
+                            {dict.settings.closeProtection}
-                        />
+                        </Label>
-                    </SettingItem>
+                        <p className="text-[0.8rem] text-muted-foreground">
+                            {dict.settings.closeProtectionDescription}
+                        </p>
+                    </div>
+                    <Switch
+                        id="close-protection"
+                        checked={closeProtection}
+                        onCheckedChange={(checked) => {
+                            setCloseProtection(checked)
+                            localStorage.setItem(
+                                STORAGE_CLOSE_PROTECTION_KEY,
+                                checked.toString(),
+                            )
+                            onCloseProtectionChange?.(checked)
+                        }}
+                    />
                 </div>
             </div>
-
+            <div className="pt-4 border-t border-border/50">
-            {/* Footer */}
+                <p className="text-[0.75rem] text-muted-foreground text-center">
-            <div className="px-6 py-4 border-t border-border-subtle bg-surface-1/50 rounded-b-2xl">
-                <p className="text-xs text-muted-foreground text-center">
                     Version {process.env.APP_VERSION}
                 </p>
             </div>
@@ -363,9 +328,9 @@ export function SettingsDialog(props: SettingsDialogProps) {
         <Dialog open={props.open} onOpenChange={props.onOpenChange}>
             <Suspense
                 fallback={
-                    <DialogContent className="sm:max-w-lg p-0">
+                    <DialogContent className="sm:max-w-md">
-                        <div className="h-80 flex items-center justify-center">
+                        <div className="h-64 flex items-center justify-center">
-                            <div className="animate-spin h-6 w-6 border-2 border-primary border-t-transparent rounded-full" />
+                            <div className="animate-spin h-8 w-8 border-4 border-primary border-t-transparent rounded-full" />
                         </div>
                     </DialogContent>
                 }

components/ui/dialog.tsx

@@ -38,10 +38,7 @@ function DialogOverlay({
     <DialogPrimitive.Overlay
       data-slot="dialog-overlay"
       className={cn(
-        "fixed inset-0 z-50 bg-black/40 backdrop-blur-[2px]",
+        "data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 fixed inset-0 z-50 bg-black/50",
-        "data-[state=open]:animate-in data-[state=closed]:animate-out",
-        "data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0",
-        "duration-200",
         className
       )}
       {...props}
@@ -60,32 +57,13 @@ function DialogContent({
       <DialogPrimitive.Content
         data-slot="dialog-content"
         className={cn(
-          // Base styles
+          "bg-background data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 fixed top-[50%] left-[50%] z-50 grid w-full max-w-[calc(100%-2rem)] translate-x-[-50%] translate-y-[-50%] gap-4 rounded-lg border p-6 shadow-lg duration-200 sm:max-w-lg",
-          "fixed top-[50%] left-[50%] z-50 w-full",
-          "max-w-[calc(100%-2rem)] translate-x-[-50%] translate-y-[-50%]",
-          "grid gap-4 p-6",
-          // Refined visual treatment
-          "bg-surface-0 rounded-2xl border border-border-subtle shadow-dialog",
-          // Entry/exit animations
-          "data-[state=open]:animate-in data-[state=closed]:animate-out",
-          "data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0",
-          "data-[state=closed]:zoom-out-[0.98] data-[state=open]:zoom-in-[0.98]",
-          "data-[state=closed]:slide-out-to-top-[2%] data-[state=open]:slide-in-from-top-[2%]",
-          "duration-200 sm:max-w-lg",
           className
         )}
         {...props}
       >
         {children}
-        <DialogPrimitive.Close className={cn(
+        <DialogPrimitive.Close className="ring-offset-background focus:ring-ring data-[state=open]:bg-accent data-[state=open]:text-muted-foreground absolute top-4 right-4 rounded-xs opacity-70 transition-opacity hover:opacity-100 focus:ring-2 focus:ring-offset-2 focus:outline-hidden disabled:pointer-events-none [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4">
-          "absolute top-4 right-4 rounded-xl p-1.5",
-          "text-muted-foreground/60 hover:text-foreground",
-          "hover:bg-interactive-hover",
-          "transition-all duration-150",
-          "focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2",
-          "disabled:pointer-events-none",
-          "[&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg]:size-4"
-        )}>
           <XIcon />
           <span className="sr-only">Close</span>
         </DialogPrimitive.Close>
@@ -124,10 +102,7 @@ function DialogTitle({
   return (
     <DialogPrimitive.Title
       data-slot="dialog-title"
-      className={cn(
+      className={cn("text-lg leading-none font-semibold", className)}
-        "text-xl font-semibold tracking-tight leading-tight",
-        className
-      )}
       {...props}
     />
   )
@@ -140,10 +115,7 @@ function DialogDescription({
   return (
     <DialogPrimitive.Description
       data-slot="dialog-description"
-      className={cn(
+      className={cn("text-muted-foreground text-sm", className)}
-        "text-sm text-muted-foreground leading-relaxed",
-        className
-      )}
       {...props}
     />
   )

components/ui/input.tsx

@@ -8,30 +8,9 @@ function Input({ className, type, ...props }: React.ComponentProps<"input">) {
       type={type}
       data-slot="input"
       className={cn(
-        // Base styles
+        "file:text-foreground placeholder:text-muted-foreground selection:bg-primary selection:text-primary-foreground dark:bg-input/30 border-input flex h-9 w-full min-w-0 rounded-md border bg-transparent px-3 py-1 text-base shadow-xs transition-[color,box-shadow] outline-none file:inline-flex file:h-7 file:border-0 file:bg-transparent file:text-sm file:font-medium disabled:pointer-events-none disabled:cursor-not-allowed disabled:opacity-50 md:text-sm",
-        "flex h-10 w-full min-w-0 rounded-xl px-3.5 py-2",
+        "focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px]",
-        "border border-border-subtle bg-surface-1",
+        "aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",
-        "text-sm text-foreground",
-        // Placeholder
-        "placeholder:text-muted-foreground/60",
-        // Selection
-        "selection:bg-primary selection:text-primary-foreground",
-        // Transitions
-        "transition-all duration-150 ease-out",
-        // Hover state
-        "hover:border-border-default",
-        // Focus state - refined ring
-        "focus:outline-none focus:border-primary focus:ring-2 focus:ring-primary/10",
-        // File input
-        "file:text-foreground file:inline-flex file:h-7 file:border-0",
-        "file:bg-transparent file:text-sm file:font-medium",
-        // Disabled
-        "disabled:pointer-events-none disabled:cursor-not-allowed disabled:opacity-50",
-        // Invalid state
-        "aria-invalid:border-destructive aria-invalid:ring-destructive/20",
-        "dark:aria-invalid:ring-destructive/40",
-        // Dark mode background
-        "dark:bg-surface-1",
         className
       )}
       {...props}

hooks/use-diagram-tool-handlers.ts

@@ -1,383 +0,0 @@
-import type { MutableRefObject } from "react"
-import { isMxCellXmlComplete, wrapWithMxFile } from "@/lib/utils"
-
-const DEBUG = process.env.NODE_ENV === "development"
-
-interface ToolCall {
-    toolCallId: string
-    toolName: string
-    input: unknown
-}
-
-type AddToolOutputSuccess = {
-    tool: string
-    toolCallId: string
-    state?: "output-available"
-    output: string
-    errorText?: undefined
-}
-
-type AddToolOutputError = {
-    tool: string
-    toolCallId: string
-    state: "output-error"
-    output?: undefined
-    errorText: string
-}
-
-type AddToolOutputParams = AddToolOutputSuccess | AddToolOutputError
-
-type AddToolOutputFn = (params: AddToolOutputParams) => void
-
-interface DiagramOperation {
-    type: "update" | "add" | "delete"
-    cell_id: string
-    new_xml?: string
-}
-
-interface UseDiagramToolHandlersParams {
-    partialXmlRef: MutableRefObject<string>
-    editDiagramOriginalXmlRef: MutableRefObject<Map<string, string>>
-    chartXMLRef: MutableRefObject<string>
-    onDisplayChart: (xml: string, skipValidation?: boolean) => string | null
-    onFetchChart: (saveToHistory?: boolean) => Promise<string>
-    onExport: () => void
-}
-
-/**
- * Hook that creates the onToolCall handler for diagram-related tools.
- * Handles display_diagram, edit_diagram, and append_diagram tools.
- *
- * Note: addToolOutput is passed at call time (not hook init) because
- * it comes from useChat which creates a circular dependency.
- */
-export function useDiagramToolHandlers({
-    partialXmlRef,
-    editDiagramOriginalXmlRef,
-    chartXMLRef,
-    onDisplayChart,
-    onFetchChart,
-    onExport,
-}: UseDiagramToolHandlersParams) {
-    const handleToolCall = async (
-        { toolCall }: { toolCall: ToolCall },
-        addToolOutput: AddToolOutputFn,
-    ) => {
-        if (DEBUG) {
-            console.log(
-                `[onToolCall] Tool: ${toolCall.toolName}, CallId: ${toolCall.toolCallId}`,
-            )
-        }
-
-        if (toolCall.toolName === "display_diagram") {
-            await handleDisplayDiagram(toolCall, addToolOutput)
-        } else if (toolCall.toolName === "edit_diagram") {
-            await handleEditDiagram(toolCall, addToolOutput)
-        } else if (toolCall.toolName === "append_diagram") {
-            handleAppendDiagram(toolCall, addToolOutput)
-        }
-    }
-
-    const handleDisplayDiagram = async (
-        toolCall: ToolCall,
-        addToolOutput: AddToolOutputFn,
-    ) => {
-        const { xml } = toolCall.input as { xml: string }
-
-        // DEBUG: Log raw input to diagnose false truncation detection
-        if (DEBUG) {
-            console.log(
-                "[display_diagram] XML ending (last 100 chars):",
-                xml.slice(-100),
-            )
-            console.log("[display_diagram] XML length:", xml.length)
-        }
-
-        // Check if XML is truncated (incomplete mxCell indicates truncated output)
-        const isTruncated = !isMxCellXmlComplete(xml)
-        if (DEBUG) {
-            console.log("[display_diagram] isTruncated:", isTruncated)
-        }
-
-        if (isTruncated) {
-            // Store the partial XML for continuation via append_diagram
-            partialXmlRef.current = xml
-
-            // Tell LLM to use append_diagram to continue
-            const partialEnding = partialXmlRef.current.slice(-500)
-            addToolOutput({
-                tool: "display_diagram",
-                toolCallId: toolCall.toolCallId,
-                state: "output-error",
-                errorText: `Output was truncated due to length limits. Use the append_diagram tool to continue.
-
-Your output ended with:
-\`\`\`
-${partialEnding}
-\`\`\`
-
-NEXT STEP: Call append_diagram with the continuation XML.
-- Do NOT include wrapper tags or root cells (id="0", id="1")
-- Start from EXACTLY where you stopped
-- Complete all remaining mxCell elements`,
-            })
-            return
-        }
-
-        // Complete XML received - use it directly
-        // (continuation is now handled via append_diagram tool)
-        const finalXml = xml
-        partialXmlRef.current = "" // Reset any partial from previous truncation
-
-        // Wrap raw XML with full mxfile structure for draw.io
-        const fullXml = wrapWithMxFile(finalXml)
-
-        // loadDiagram validates and returns error if invalid
-        const validationError = onDisplayChart(fullXml)
-
-        if (validationError) {
-            console.warn("[display_diagram] Validation error:", validationError)
-            // Return error to model - sendAutomaticallyWhen will trigger retry
-            if (DEBUG) {
-                console.log(
-                    "[display_diagram] Adding tool output with state: output-error",
-                )
-            }
-            addToolOutput({
-                tool: "display_diagram",
-                toolCallId: toolCall.toolCallId,
-                state: "output-error",
-                errorText: `${validationError}
-
-Please fix the XML issues and call display_diagram again with corrected XML.
-
-Your failed XML:
-\`\`\`xml
-${finalXml}
-\`\`\``,
-            })
-        } else {
-            // Success - diagram will be rendered by chat-message-display
-            if (DEBUG) {
-                console.log(
-                    "[display_diagram] Success! Adding tool output with state: output-available",
-                )
-            }
-            addToolOutput({
-                tool: "display_diagram",
-                toolCallId: toolCall.toolCallId,
-                output: "Successfully displayed the diagram.",
-            })
-            if (DEBUG) {
-                console.log(
-                    "[display_diagram] Tool output added. Diagram should be visible now.",
-                )
-            }
-        }
-    }
-
-    const handleEditDiagram = async (
-        toolCall: ToolCall,
-        addToolOutput: AddToolOutputFn,
-    ) => {
-        const { operations } = toolCall.input as {
-            operations: DiagramOperation[]
-        }
-
-        let currentXml = ""
-        try {
-            // Use the original XML captured during streaming (shared with chat-message-display)
-            // This ensures we apply operations to the same base XML that streaming used
-            const originalXml = editDiagramOriginalXmlRef.current.get(
-                toolCall.toolCallId,
-            )
-            if (originalXml) {
-                currentXml = originalXml
-            } else {
-                // Fallback: use chartXML from ref if streaming didn't capture original
-                const cachedXML = chartXMLRef.current
-                if (cachedXML) {
-                    currentXml = cachedXML
-                } else {
-                    // Last resort: export from iframe
-                    currentXml = await onFetchChart(false)
-                }
-            }
-
-            const { applyDiagramOperations } = await import("@/lib/utils")
-            const { result: editedXml, errors } = applyDiagramOperations(
-                currentXml,
-                operations,
-            )
-
-            // Check for operation errors
-            if (errors.length > 0) {
-                const errorMessages = errors
-                    .map(
-                        (e) =>
-                            `- ${e.type} on cell_id="${e.cellId}": ${e.message}`,
-                    )
-                    .join("\n")
-
-                addToolOutput({
-                    tool: "edit_diagram",
-                    toolCallId: toolCall.toolCallId,
-                    state: "output-error",
-                    errorText: `Some operations failed:\n${errorMessages}
-
-Current diagram XML:
-\`\`\`xml
-${currentXml}
-\`\`\`
-
-Please check the cell IDs and retry.`,
-                })
-                // Clean up the shared original XML ref
-                editDiagramOriginalXmlRef.current.delete(toolCall.toolCallId)
-                return
-            }
-
-            // loadDiagram validates and returns error if invalid
-            const validationError = onDisplayChart(editedXml)
-            if (validationError) {
-                console.warn(
-                    "[edit_diagram] Validation error:",
-                    validationError,
-                )
-                addToolOutput({
-                    tool: "edit_diagram",
-                    toolCallId: toolCall.toolCallId,
-                    state: "output-error",
-                    errorText: `Edit produced invalid XML: ${validationError}
-
-Current diagram XML:
-\`\`\`xml
-${currentXml}
-\`\`\`
-
-Please fix the operations to avoid structural issues.`,
-                })
-                // Clean up the shared original XML ref
-                editDiagramOriginalXmlRef.current.delete(toolCall.toolCallId)
-                return
-            }
-            onExport()
-            addToolOutput({
-                tool: "edit_diagram",
-                toolCallId: toolCall.toolCallId,
-                output: `Successfully applied ${operations.length} operation(s) to the diagram.`,
-            })
-            // Clean up the shared original XML ref
-            editDiagramOriginalXmlRef.current.delete(toolCall.toolCallId)
-        } catch (error) {
-            console.error("[edit_diagram] Failed:", error)
-
-            const errorMessage =
-                error instanceof Error ? error.message : String(error)
-
-            addToolOutput({
-                tool: "edit_diagram",
-                toolCallId: toolCall.toolCallId,
-                state: "output-error",
-                errorText: `Edit failed: ${errorMessage}
-
-Current diagram XML:
-\`\`\`xml
-${currentXml || "No XML available"}
-\`\`\`
-
-Please check cell IDs and retry, or use display_diagram to regenerate.`,
-            })
-            // Clean up the shared original XML ref even on error
-            editDiagramOriginalXmlRef.current.delete(toolCall.toolCallId)
-        }
-    }
-
-    const handleAppendDiagram = (
-        toolCall: ToolCall,
-        addToolOutput: AddToolOutputFn,
-    ) => {
-        const { xml } = toolCall.input as { xml: string }
-
-        // Detect if LLM incorrectly started fresh instead of continuing
-        // LLM should only output bare mxCells now, so wrapper tags indicate error
-        const trimmed = xml.trim()
-        const isFreshStart =
-            trimmed.startsWith("<mxGraphModel") ||
-            trimmed.startsWith("<root") ||
-            trimmed.startsWith("<mxfile") ||
-            trimmed.startsWith('<mxCell id="0"') ||
-            trimmed.startsWith('<mxCell id="1"')
-
-        if (isFreshStart) {
-            addToolOutput({
-                tool: "append_diagram",
-                toolCallId: toolCall.toolCallId,
-                state: "output-error",
-                errorText: `ERROR: You started fresh with wrapper tags. Do NOT include wrapper tags or root cells (id="0", id="1").
-
-Continue from EXACTLY where the partial ended:
-\`\`\`
-${partialXmlRef.current.slice(-500)}
-\`\`\`
-
-Start your continuation with the NEXT character after where it stopped.`,
-            })
-            return
-        }
-
-        // Append to accumulated XML
-        partialXmlRef.current += xml
-
-        // Check if XML is now complete (last mxCell is complete)
-        const isComplete = isMxCellXmlComplete(partialXmlRef.current)
-
-        if (isComplete) {
-            // Wrap and display the complete diagram
-            const finalXml = partialXmlRef.current
-            partialXmlRef.current = "" // Reset
-
-            const fullXml = wrapWithMxFile(finalXml)
-            const validationError = onDisplayChart(fullXml)
-
-            if (validationError) {
-                addToolOutput({
-                    tool: "append_diagram",
-                    toolCallId: toolCall.toolCallId,
-                    state: "output-error",
-                    errorText: `Validation error after assembly: ${validationError}
-
-Assembled XML:
-\`\`\`xml
-${finalXml.substring(0, 2000)}...
-\`\`\`
-
-Please use display_diagram with corrected XML.`,
-                })
-            } else {
-                addToolOutput({
-                    tool: "append_diagram",
-                    toolCallId: toolCall.toolCallId,
-                    output: "Diagram assembly complete and displayed successfully.",
-                })
-            }
-        } else {
-            // Still incomplete - signal to continue
-            addToolOutput({
-                tool: "append_diagram",
-                toolCallId: toolCall.toolCallId,
-                state: "output-error",
-                errorText: `XML still incomplete (mxCell not closed). Call append_diagram again to continue.
-
-Current ending:
-\`\`\`
-${partialXmlRef.current.slice(-500)}
-\`\`\`
-
-Continue from EXACTLY where you stopped.`,
-            })
-        }
-    }
-
-    return { handleToolCall }
-}

lib/ai-providers.ts

@@ -588,15 +588,13 @@ export function getAIModel(overrides?: ClientOverrides): ModelConfig {
         case "openai": {
             const apiKey = overrides?.apiKey || process.env.OPENAI_API_KEY
             const baseURL = overrides?.baseUrl || process.env.OPENAI_BASE_URL
-            if (baseURL) {
+            if (baseURL || overrides?.apiKey) {
-                // Custom base URL = third-party proxy, use Chat Completions API
+                const customOpenAI = createOpenAI({
-                // for compatibility (most proxies don't support /responses endpoint)
+                    apiKey,
-                const customOpenAI = createOpenAI({ apiKey, baseURL })
+                    ...(baseURL && { baseURL }),
-                model = customOpenAI.chat(modelId)
+                })
-            } else if (overrides?.apiKey) {
+                // Use Responses API (default) instead of .chat() to support reasoning
-                // Custom API key but official OpenAI endpoint, use Responses API
+                // for gpt-5, o1, o3, o4 models. Chat Completions API does not emit reasoning events.
-                // to support reasoning for gpt-5, o1, o3, o4 models
-                const customOpenAI = createOpenAI({ apiKey })
                 model = customOpenAI(modelId)
             } else {
                 model = openai(modelId)

lib/dynamo-quota-manager.ts

@@ -1,238 +0,0 @@
-import {
-    ConditionalCheckFailedException,
-    DynamoDBClient,
-    GetItemCommand,
-    UpdateItemCommand,
-} from "@aws-sdk/client-dynamodb"
-
-// Quota tracking is OPT-IN: only enabled if DYNAMODB_QUOTA_TABLE is explicitly set
-// OSS users who don't need quota tracking can simply not set this env var
-const TABLE = process.env.DYNAMODB_QUOTA_TABLE
-const DYNAMODB_REGION = process.env.DYNAMODB_REGION || "ap-northeast-1"
-
-// Only create client if quota is enabled
-const client = TABLE ? new DynamoDBClient({ region: DYNAMODB_REGION }) : null
-
-/**
- * Check if server-side quota tracking is enabled.
- * Quota is opt-in: only enabled when DYNAMODB_QUOTA_TABLE env var is set.
- */
-export function isQuotaEnabled(): boolean {
-    return !!TABLE
-}
-
-interface QuotaLimits {
-    requests: number // Daily request limit
-    tokens: number // Daily token limit
-    tpm: number // Tokens per minute
-}
-
-interface QuotaCheckResult {
-    allowed: boolean
-    error?: string
-    type?: "request" | "token" | "tpm"
-    used?: number
-    limit?: number
-}
-
-/**
- * Check all quotas and increment request count atomically.
- * Uses ConditionExpression to prevent race conditions.
- * Returns which limit was exceeded if any.
- */
-export async function checkAndIncrementRequest(
-    ip: string,
-    limits: QuotaLimits,
-): Promise<QuotaCheckResult> {
-    // Skip if quota tracking not enabled
-    if (!client || !TABLE) {
-        return { allowed: true }
-    }
-
-    const today = new Date().toISOString().split("T")[0]
-    const currentMinute = Math.floor(Date.now() / 60000).toString()
-    const ttl = Math.floor(Date.now() / 1000) + 7 * 24 * 60 * 60
-
-    try {
-        // Atomic check-and-increment with ConditionExpression
-        // This prevents race conditions by failing if limits are exceeded
-        await client.send(
-            new UpdateItemCommand({
-                TableName: TABLE,
-                Key: { PK: { S: `IP#${ip}` } },
-                // Reset counts if new day/minute, then increment request count
-                UpdateExpression: `
-                    SET lastResetDate = :today,
-                        dailyReqCount = if_not_exists(dailyReqCount, :zero) + :one,
-                        dailyTokenCount = if_not_exists(dailyTokenCount, :zero),
-                        lastMinute = :minute,
-                        tpmCount = if_not_exists(tpmCount, :zero),
-                        #ttl = :ttl
-                `,
-                // Atomic condition: only succeed if ALL limits pass
-                // Uses attribute_not_exists for new items, then checks limits for existing items
-                ConditionExpression: `
-                    (attribute_not_exists(lastResetDate) OR lastResetDate < :today OR
-                     ((attribute_not_exists(dailyReqCount) OR dailyReqCount < :reqLimit) AND
-                      (attribute_not_exists(dailyTokenCount) OR dailyTokenCount < :tokenLimit))) AND
-                    (attribute_not_exists(lastMinute) OR lastMinute <> :minute OR
-                     attribute_not_exists(tpmCount) OR tpmCount < :tpmLimit)
-                `,
-                ExpressionAttributeNames: { "#ttl": "ttl" },
-                ExpressionAttributeValues: {
-                    ":today": { S: today },
-                    ":zero": { N: "0" },
-                    ":one": { N: "1" },
-                    ":minute": { S: currentMinute },
-                    ":ttl": { N: String(ttl) },
-                    ":reqLimit": { N: String(limits.requests || 999999) },
-                    ":tokenLimit": { N: String(limits.tokens || 999999) },
-                    ":tpmLimit": { N: String(limits.tpm || 999999) },
-                },
-            }),
-        )
-
-        return { allowed: true }
-    } catch (e: any) {
-        // Condition failed - need to determine which limit was exceeded
-        if (e instanceof ConditionalCheckFailedException) {
-            // Get current counts to determine which limit was hit
-            try {
-                const getResult = await client.send(
-                    new GetItemCommand({
-                        TableName: TABLE,
-                        Key: { PK: { S: `IP#${ip}` } },
-                    }),
-                )
-
-                const item = getResult.Item
-                const storedDate = item?.lastResetDate?.S
-                const storedMinute = item?.lastMinute?.S
-                const isNewDay = !storedDate || storedDate < today
-
-                const dailyReqCount = isNewDay
-                    ? 0
-                    : Number(item?.dailyReqCount?.N || 0)
-                const dailyTokenCount = isNewDay
-                    ? 0
-                    : Number(item?.dailyTokenCount?.N || 0)
-                const tpmCount =
-                    storedMinute !== currentMinute
-                        ? 0
-                        : Number(item?.tpmCount?.N || 0)
-
-                // Determine which limit was exceeded
-                if (limits.requests > 0 && dailyReqCount >= limits.requests) {
-                    return {
-                        allowed: false,
-                        type: "request",
-                        error: "Daily request limit exceeded",
-                        used: dailyReqCount,
-                        limit: limits.requests,
-                    }
-                }
-                if (limits.tokens > 0 && dailyTokenCount >= limits.tokens) {
-                    return {
-                        allowed: false,
-                        type: "token",
-                        error: "Daily token limit exceeded",
-                        used: dailyTokenCount,
-                        limit: limits.tokens,
-                    }
-                }
-                if (limits.tpm > 0 && tpmCount >= limits.tpm) {
-                    return {
-                        allowed: false,
-                        type: "tpm",
-                        error: "Rate limit exceeded (tokens per minute)",
-                        used: tpmCount,
-                        limit: limits.tpm,
-                    }
-                }
-
-                // Condition failed but no limit clearly exceeded - race condition edge case
-                // Fail safe by allowing (could be a reset race)
-                console.warn(
-                    `[quota] Condition failed but no limit exceeded for IP prefix: ${ip.slice(0, 8)}...`,
-                )
-                return { allowed: true }
-            } catch (getError: any) {
-                console.error(
-                    `[quota] Failed to get quota details after condition failure, IP prefix: ${ip.slice(0, 8)}..., error: ${getError.message}`,
-                )
-                return { allowed: true } // Fail open
-            }
-        }
-
-        // Other DynamoDB errors - fail open
-        console.error(
-            `[quota] DynamoDB error (fail-open), IP prefix: ${ip.slice(0, 8)}..., error: ${e.message}`,
-        )
-        return { allowed: true }
-    }
-}
-
-/**
- * Record token usage after response completes.
- * Uses atomic operations to update both daily token count and TPM count.
- * Handles minute boundaries atomically to prevent race conditions.
- */
-export async function recordTokenUsage(
-    ip: string,
-    tokens: number,
-): Promise<void> {
-    // Skip if quota tracking not enabled
-    if (!client || !TABLE) return
-    if (!Number.isFinite(tokens) || tokens <= 0) return
-
-    const currentMinute = Math.floor(Date.now() / 60000).toString()
-    const ttl = Math.floor(Date.now() / 1000) + 7 * 24 * 60 * 60
-
-    try {
-        // Try to update assuming same minute (most common case)
-        // Uses condition to ensure we're in the same minute
-        await client.send(
-            new UpdateItemCommand({
-                TableName: TABLE,
-                Key: { PK: { S: `IP#${ip}` } },
-                UpdateExpression:
-                    "SET #ttl = :ttl ADD dailyTokenCount :tokens, tpmCount :tokens",
-                ConditionExpression: "lastMinute = :minute",
-                ExpressionAttributeNames: { "#ttl": "ttl" },
-                ExpressionAttributeValues: {
-                    ":minute": { S: currentMinute },
-                    ":tokens": { N: String(tokens) },
-                    ":ttl": { N: String(ttl) },
-                },
-            }),
-        )
-    } catch (e: any) {
-        if (e instanceof ConditionalCheckFailedException) {
-            // Different minute - reset TPM count and set new minute
-            try {
-                await client.send(
-                    new UpdateItemCommand({
-                        TableName: TABLE,
-                        Key: { PK: { S: `IP#${ip}` } },
-                        UpdateExpression:
-                            "SET lastMinute = :minute, tpmCount = :tokens, #ttl = :ttl ADD dailyTokenCount :tokens",
-                        ExpressionAttributeNames: { "#ttl": "ttl" },
-                        ExpressionAttributeValues: {
-                            ":minute": { S: currentMinute },
-                            ":tokens": { N: String(tokens) },
-                            ":ttl": { N: String(ttl) },
-                        },
-                    }),
-                )
-            } catch (retryError: any) {
-                console.error(
-                    `[quota] Failed to record tokens (retry), IP prefix: ${ip.slice(0, 8)}..., tokens: ${tokens}, error: ${retryError.message}`,
-                )
-            }
-        } else {
-            console.error(
-                `[quota] Failed to record tokens, IP prefix: ${ip.slice(0, 8)}..., tokens: ${tokens}, error: ${e.message}`,
-            )
-        }
-    }
-}

lib/langfuse.ts

@@ -21,11 +21,9 @@ export function getLangfuseClient(): LangfuseClient | null {
     return langfuseClient
 }
 
-// Check if Langfuse is configured (both keys required)
+// Check if Langfuse is configured
 export function isLangfuseEnabled(): boolean {
-    return !!(
+    return !!process.env.LANGFUSE_PUBLIC_KEY
-        process.env.LANGFUSE_PUBLIC_KEY && process.env.LANGFUSE_SECRET_KEY
-    )
 }
 
 // Update trace with input data at the start of request
@@ -45,16 +43,34 @@ export function setTraceInput(params: {
 }
 
 // Update trace with output and end the span
-// Note: AI SDK 6 telemetry automatically reports token usage on its spans,
+export function setTraceOutput(
-// so we only need to set the output text and close our wrapper span
+    output: string,
-export function setTraceOutput(output: string) {
+    usage?: { promptTokens?: number; completionTokens?: number },
+) {
     if (!isLangfuseEnabled()) return
 
     updateActiveTrace({ output })
 
-    // End the observe() wrapper span (AI SDK creates its own child spans with usage)
     const activeSpan = api.trace.getActiveSpan()
     if (activeSpan) {
+        // Manually set usage attributes since AI SDK Bedrock streaming doesn't provide them
+        if (usage?.promptTokens) {
+            activeSpan.setAttribute("ai.usage.promptTokens", usage.promptTokens)
+            activeSpan.setAttribute(
+                "gen_ai.usage.input_tokens",
+                usage.promptTokens,
+            )
+        }
+        if (usage?.completionTokens) {
+            activeSpan.setAttribute(
+                "ai.usage.completionTokens",
+                usage.completionTokens,
+            )
+            activeSpan.setAttribute(
+                "gen_ai.usage.output_tokens",
+                usage.completionTokens,
+            )
+        }
         activeSpan.end()
     }
 }

lib/use-quota-manager.tsx

@@ -1,10 +1,11 @@
 "use client"
 
-import { useCallback } from "react"
+import { useCallback, useMemo } from "react"
 import { toast } from "sonner"
 import { QuotaLimitToast } from "@/components/quota-limit-toast"
 import { useDictionary } from "@/hooks/use-dictionary"
 import { formatMessage } from "@/lib/i18n/utils"
+import { STORAGE_KEYS } from "@/lib/storage"
 
 export interface QuotaConfig {
     dailyRequestLimit: number
@@ -12,45 +13,181 @@ export interface QuotaConfig {
     tpmLimit: number
 }
 
+export interface QuotaCheckResult {
+    allowed: boolean
+    remaining: number
+    used: number
+}
+
 /**
- * Hook for displaying quota limit toasts.
+ * Hook for managing request/token quotas and rate limiting.
- * Server-side handles actual quota enforcement via DynamoDB.
+ * Handles three types of limits:
- * This hook only provides UI feedback when limits are exceeded.
+ * - Daily request limit
+ * - Daily token limit
+ * - Tokens per minute (TPM) rate limit
+ *
+ * Users with their own API key bypass all limits.
  */
 export function useQuotaManager(config: QuotaConfig): {
-    showQuotaLimitToast: (used?: number, limit?: number) => void
+    hasOwnApiKey: () => boolean
-    showTokenLimitToast: (used?: number, limit?: number) => void
+    checkDailyLimit: () => QuotaCheckResult
-    showTPMLimitToast: (limit?: number) => void
+    checkTokenLimit: () => QuotaCheckResult
+    checkTPMLimit: () => QuotaCheckResult
+    incrementRequestCount: () => void
+    incrementTokenCount: (tokens: number) => void
+    incrementTPMCount: (tokens: number) => void
+    showQuotaLimitToast: () => void
+    showTokenLimitToast: (used: number) => void
+    showTPMLimitToast: () => void
 } {
     const { dailyRequestLimit, dailyTokenLimit, tpmLimit } = config
+
     const dict = useDictionary()
 
-    // Show quota limit toast (request-based)
+    // Check if user has their own API key configured (bypass limits)
-    const showQuotaLimitToast = useCallback(
+    const hasOwnApiKey = useCallback((): boolean => {
-        (used?: number, limit?: number) => {
+        const provider = localStorage.getItem(STORAGE_KEYS.aiProvider)
-            toast.custom(
+        const apiKey = localStorage.getItem(STORAGE_KEYS.aiApiKey)
-                (t) => (
+        return !!(provider && apiKey)
-                    <QuotaLimitToast
+    }, [])
-                        used={used ?? dailyRequestLimit}
+
-                        limit={limit ?? dailyRequestLimit}
+    // Generic helper: Parse count from localStorage with NaN guard
-                        onDismiss={() => toast.dismiss(t)}
+    const parseStorageCount = (key: string): number => {
-                    />
+        const count = parseInt(localStorage.getItem(key) || "0", 10)
-                ),
+        return Number.isNaN(count) ? 0 : count
-                { duration: 15000 },
+    }
-            )
+
+    // Generic helper: Create quota checker factory
+    const createQuotaChecker = useCallback(
+        (
+            getTimeKey: () => string,
+            timeStorageKey: string,
+            countStorageKey: string,
+            limit: number,
+        ) => {
+            return (): QuotaCheckResult => {
+                if (hasOwnApiKey())
+                    return { allowed: true, remaining: -1, used: 0 }
+                if (limit <= 0) return { allowed: true, remaining: -1, used: 0 }
+
+                const currentTime = getTimeKey()
+                const storedTime = localStorage.getItem(timeStorageKey)
+                let count = parseStorageCount(countStorageKey)
+
+                if (storedTime !== currentTime) {
+                    count = 0
+                    localStorage.setItem(timeStorageKey, currentTime)
+                    localStorage.setItem(countStorageKey, "0")
+                }
+
+                return {
+                    allowed: count < limit,
+                    remaining: limit - count,
+                    used: count,
+                }
+            }
         },
-        [dailyRequestLimit],
+        [hasOwnApiKey],
+    )
+
+    // Generic helper: Create quota incrementer factory
+    const createQuotaIncrementer = useCallback(
+        (
+            getTimeKey: () => string,
+            timeStorageKey: string,
+            countStorageKey: string,
+            validateInput: boolean = false,
+        ) => {
+            return (tokens: number = 1): void => {
+                if (validateInput && (!Number.isFinite(tokens) || tokens <= 0))
+                    return
+
+                const currentTime = getTimeKey()
+                const storedTime = localStorage.getItem(timeStorageKey)
+                let count = parseStorageCount(countStorageKey)
+
+                if (storedTime !== currentTime) {
+                    count = 0
+                    localStorage.setItem(timeStorageKey, currentTime)
+                }
+
+                localStorage.setItem(countStorageKey, String(count + tokens))
+            }
+        },
+        [],
+    )
+
+    // Check daily request limit
+    const checkDailyLimit = useMemo(
+        () =>
+            createQuotaChecker(
+                () => new Date().toDateString(),
+                STORAGE_KEYS.requestDate,
+                STORAGE_KEYS.requestCount,
+                dailyRequestLimit,
+            ),
+        [createQuotaChecker, dailyRequestLimit],
+    )
+
+    // Increment request count
+    const incrementRequestCount = useMemo(
+        () =>
+            createQuotaIncrementer(
+                () => new Date().toDateString(),
+                STORAGE_KEYS.requestDate,
+                STORAGE_KEYS.requestCount,
+                false,
+            ),
+        [createQuotaIncrementer],
+    )
+
+    // Show quota limit toast (request-based)
+    const showQuotaLimitToast = useCallback(() => {
+        toast.custom(
+            (t) => (
+                <QuotaLimitToast
+                    used={dailyRequestLimit}
+                    limit={dailyRequestLimit}
+                    onDismiss={() => toast.dismiss(t)}
+                />
+            ),
+            { duration: 15000 },
+        )
+    }, [dailyRequestLimit])
+
+    // Check daily token limit
+    const checkTokenLimit = useMemo(
+        () =>
+            createQuotaChecker(
+                () => new Date().toDateString(),
+                STORAGE_KEYS.tokenDate,
+                STORAGE_KEYS.tokenCount,
+                dailyTokenLimit,
+            ),
+        [createQuotaChecker, dailyTokenLimit],
+    )
+
+    // Increment token count
+    const incrementTokenCount = useMemo(
+        () =>
+            createQuotaIncrementer(
+                () => new Date().toDateString(),
+                STORAGE_KEYS.tokenDate,
+                STORAGE_KEYS.tokenCount,
+                true, // Validate input tokens
+            ),
+        [createQuotaIncrementer],
     )
 
     // Show token limit toast
     const showTokenLimitToast = useCallback(
-        (used?: number, limit?: number) => {
+        (used: number) => {
             toast.custom(
                 (t) => (
                     <QuotaLimitToast
                         type="token"
-                        used={used ?? dailyTokenLimit}
+                        used={used}
-                        limit={limit ?? dailyTokenLimit}
+                        limit={dailyTokenLimit}
                         onDismiss={() => toast.dismiss(t)}
                     />
                 ),
@@ -60,24 +197,54 @@ export function useQuotaManager(config: QuotaConfig): {
         [dailyTokenLimit],
     )
 
-    // Show TPM limit toast
+    // Check TPM (tokens per minute) limit
-    const showTPMLimitToast = useCallback(
+    const checkTPMLimit = useMemo(
-        (limit?: number) => {
+        () =>
-            const effectiveLimit = limit ?? tpmLimit
+            createQuotaChecker(
-            const limitDisplay =
+                () => Math.floor(Date.now() / 60000).toString(),
-                effectiveLimit >= 1000
+                STORAGE_KEYS.tpmMinute,
-                    ? `${effectiveLimit / 1000}k`
+                STORAGE_KEYS.tpmCount,
-                    : String(effectiveLimit)
+                tpmLimit,
-            const message = formatMessage(dict.quota.tpmMessageDetailed, {
+            ),
-                limit: limitDisplay,
+        [createQuotaChecker, tpmLimit],
-                seconds: 60,
-            })
-            toast.error(message, { duration: 8000 })
-        },
-        [tpmLimit, dict],
     )
 
+    // Increment TPM count
+    const incrementTPMCount = useMemo(
+        () =>
+            createQuotaIncrementer(
+                () => Math.floor(Date.now() / 60000).toString(),
+                STORAGE_KEYS.tpmMinute,
+                STORAGE_KEYS.tpmCount,
+                true, // Validate input tokens
+            ),
+        [createQuotaIncrementer],
+    )
+
+    // Show TPM limit toast
+    const showTPMLimitToast = useCallback(() => {
+        const limitDisplay =
+            tpmLimit >= 1000 ? `${tpmLimit / 1000}k` : String(tpmLimit)
+        const message = formatMessage(dict.quota.tpmMessageDetailed, {
+            limit: limitDisplay,
+            seconds: 60,
+        })
+        toast.error(message, { duration: 8000 })
+    }, [tpmLimit, dict])
+
     return {
+        // Check functions
+        hasOwnApiKey,
+        checkDailyLimit,
+        checkTokenLimit,
+        checkTPMLimit,
+
+        // Increment functions
+        incrementRequestCount,
+        incrementTokenCount,
+        incrementTPMCount,
+
+        // Toast functions
         showQuotaLimitToast,
         showTokenLimitToast,
         showTPMLimitToast,

lib/utils.ts

@@ -36,73 +36,29 @@ const VALID_ENTITIES = new Set(["lt", "gt", "amp", "quot", "apos"])
 /**
  * Check if mxCell XML output is complete (not truncated).
  * Complete XML ends with a self-closing tag (/>) or closing mxCell tag.
- * Uses a robust approach that handles any LLM provider's wrapper tags
+ * Also handles function-calling wrapper tags that may be incorrectly included.
- * by finding the last valid mxCell ending and checking if suffix is just closing tags.
  * @param xml - The XML string to check (can be undefined/null)
  * @returns true if XML appears complete, false if truncated or empty
  */
 export function isMxCellXmlComplete(xml: string | undefined | null): boolean {
-    const trimmed = xml?.trim() || ""
+    let trimmed = xml?.trim() || ""
     if (!trimmed) return false
 
-    // Find position of last complete mxCell ending (either /> or </mxCell>)
+    // Strip Anthropic function-calling wrapper tags if present
-    const lastSelfClose = trimmed.lastIndexOf("/>")
+    // These can leak into tool input due to AI SDK parsing issues
-    const lastMxCellClose = trimmed.lastIndexOf("</mxCell>")
+    // Use loop because tags are nested: </mxCell></mxParameter></invoke>
-
+    let prev = ""
-    const lastValidEnd = Math.max(lastSelfClose, lastMxCellClose)
+    while (prev !== trimmed) {
-
+        prev = trimmed
-    // No valid ending found at all
+        trimmed = trimmed
-    if (lastValidEnd === -1) return false
+            .replace(/<\/mxParameter>\s*$/i, "")
-
+            .replace(/<\/invoke>\s*$/i, "")
-    // Check what comes after the last valid ending
+            .replace(/<\/antml:parameter>\s*$/i, "")
-    // For />: add 2 chars, for </mxCell>: add 9 chars
+            .replace(/<\/antml:invoke>\s*$/i, "")
-    const endOffset = lastMxCellClose > lastSelfClose ? 9 : 2
+            .trim()
-    const suffix = trimmed.slice(lastValidEnd + endOffset)
-
-    // If suffix is empty or only contains closing tags (any provider's wrapper) or whitespace, it's complete
-    // This regex matches any sequence of closing XML tags like </foo>, </bar>, </｜DSML｜xyz>
-    return /^(\s*<\/[^>]+>)*\s*$/.test(suffix)
-}
-
-/**
- * Extract only complete mxCell elements from partial/streaming XML.
- * This allows progressive rendering during streaming by ignoring incomplete trailing elements.
- * @param xml - The partial XML string (may contain incomplete trailing mxCell)
- * @returns XML string containing only complete mxCell elements
- */
-export function extractCompleteMxCells(xml: string | undefined | null): string {
-    if (!xml) return ""
-
-    const completeCells: Array<{ index: number; text: string }> = []
-
-    // Match self-closing mxCell tags: <mxCell ... />
-    // Also match mxCell with nested mxGeometry: <mxCell ...>...<mxGeometry .../></mxCell>
-    const selfClosingPattern = /<mxCell\s+[^>]*\/>/g
-    const nestedPattern = /<mxCell\s+[^>]*>[\s\S]*?<\/mxCell>/g
-
-    // Find all self-closing mxCell elements
-    let match: RegExpExecArray | null
-    while ((match = selfClosingPattern.exec(xml)) !== null) {
-        completeCells.push({ index: match.index, text: match[0] })
     }
 
-    // Find all mxCell elements with nested content (like mxGeometry)
+    return trimmed.endsWith("/>") || trimmed.endsWith("</mxCell>")
-    while ((match = nestedPattern.exec(xml)) !== null) {
-        completeCells.push({ index: match.index, text: match[0] })
-    }
-
-    // Sort by position to maintain order
-    completeCells.sort((a, b) => a.index - b.index)
-
-    // Remove duplicates (a self-closing match might overlap with nested match)
-    const seen = new Set<number>()
-    const uniqueCells = completeCells.filter((cell) => {
-        if (seen.has(cell.index)) return false
-        seen.add(cell.index)
-        return true
-    })
-
-    return uniqueCells.map((c) => c.text).join("\n")
 }
 
 // ============================================================================
@@ -265,21 +221,6 @@ export function convertToLegalXml(xmlString: string): string {
             "&amp;",
         )
 
-        // Fix unescaped < and > in attribute values for XML parsing
-        // HTML content in value attributes (e.g., <b>Title</b>) needs to be escaped
-        // This is critical because DOMParser will fail on unescaped < > in attributes
-        if (/=\s*"[^"]*<[^"]*"/.test(cellContent)) {
-            cellContent = cellContent.replace(
-                /=\s*"([^"]*)"/g,
-                (_match, value) => {
-                    const escaped = value
-                        .replace(/</g, "&lt;")
-                        .replace(/>/g, "&gt;")
-                    return `="${escaped}"`
-                },
-            )
-        }
-
         // Indent each line of the matched block for readability.
         const formatted = cellContent
             .split("\n")
@@ -324,20 +265,6 @@ export function wrapWithMxFile(xml: string): string {
         content = xml.replace(/<\/?root>/g, "").trim()
     }
 
-    // Strip trailing LLM wrapper tags (from any provider: Anthropic, DeepSeek, etc.)
-    // Find the last valid mxCell ending and remove everything after it
-    const lastSelfClose = content.lastIndexOf("/>")
-    const lastMxCellClose = content.lastIndexOf("</mxCell>")
-    const lastValidEnd = Math.max(lastSelfClose, lastMxCellClose)
-    if (lastValidEnd !== -1) {
-        const endOffset = lastMxCellClose > lastSelfClose ? 9 : 2
-        const suffix = content.slice(lastValidEnd + endOffset)
-        // If suffix is only closing tags (wrapper tags), strip it
-        if (/^(\s*<\/[^>]+>)*\s*$/.test(suffix)) {
-            content = content.slice(0, lastValidEnd + endOffset)
-        }
-    }
-
     // Remove any existing root cells from content (LLM shouldn't include them, but handle it gracefully)
     // Use flexible patterns that match both self-closing (/>) and non-self-closing (></mxCell>) formats
     content = content
@@ -942,21 +869,6 @@ export function autoFixXml(xml: string): { fixed: string; fixes: string[] } {
         fixes.push("Removed CDATA wrapper")
     }
 
-    // 1b. Strip trailing LLM wrapper tags (DeepSeek, Anthropic, etc.)
-    // These are closing tags after the last valid mxCell that break XML parsing
-    const lastSelfClose = fixed.lastIndexOf("/>")
-    const lastMxCellClose = fixed.lastIndexOf("</mxCell>")
-    const lastValidEnd = Math.max(lastSelfClose, lastMxCellClose)
-    if (lastValidEnd !== -1) {
-        const endOffset = lastMxCellClose > lastSelfClose ? 9 : 2
-        const suffix = fixed.slice(lastValidEnd + endOffset)
-        // If suffix contains only closing tags (wrapper tags) or whitespace, strip it
-        if (/^(\s*<\/[^>]+>)+\s*$/.test(suffix)) {
-            fixed = fixed.slice(0, lastValidEnd + endOffset)
-            fixes.push("Stripped trailing LLM wrapper tags")
-        }
-    }
-
     // 2. Remove text before XML declaration or root element (only if it's garbage text, not valid XML)
     const xmlStart = fixed.search(/<(\?xml|mxGraphModel|mxfile)/i)
     if (xmlStart > 0 && !/^<[a-zA-Z]/.test(fixed.trim())) {
@@ -1062,8 +974,8 @@ export function autoFixXml(xml: string): { fixed: string; fixes: string[] } {
         fixes.push("Removed quotes around color values in style")
     }
 
-    // 4. Fix unescaped < and > in attribute values
+    // 4. Fix unescaped < in attribute values
-    // < is required to be escaped, > is not strictly required but we escape for consistency
+    // This is tricky - we need to find < inside quoted attribute values
     const attrPattern = /(=\s*")([^"]*?)(<)([^"]*?)(")/g
     let attrMatch
     let hasUnescapedLt = false
@@ -1074,12 +986,12 @@ export function autoFixXml(xml: string): { fixed: string; fixes: string[] } {
         }
     }
     if (hasUnescapedLt) {
-        // Replace < and > with &lt; and &gt; inside attribute values
+        // Replace < with &lt; inside attribute values
         fixed = fixed.replace(/=\s*"([^"]*)"/g, (_match, value) => {
-            const escaped = value.replace(/</g, "&lt;").replace(/>/g, "&gt;")
+            const escaped = value.replace(/</g, "&lt;")
             return `="${escaped}"`
         })
-        fixes.push("Escaped <> characters in attribute values")
+        fixes.push("Escaped < characters in attribute values")
     }
 
     // 5. Fix invalid character references (remove malformed ones)
@@ -1167,8 +1079,7 @@ export function autoFixXml(xml: string): { fixed: string; fixes: string[] } {
     }
 
     // 8c. Remove non-draw.io tags (after typo fixes so lowercase variants are fixed first)
-    // IMPORTANT: Only remove tags at the element level, NOT inside quoted attribute values
+    // Valid draw.io tags: mxfile, diagram, mxGraphModel, root, mxCell, mxGeometry, mxPoint, Array, Object
-    // Tags like <b>, <br> inside value="<b>text</b>" should be preserved (they're HTML content)
     const validDrawioTags = new Set([
         "mxfile",
         "diagram",
@@ -1181,59 +1092,25 @@ export function autoFixXml(xml: string): { fixed: string; fixes: string[] } {
         "Object",
         "mxRectangle",
     ])
-
-    // Helper: Check if a position is inside a quoted attribute value
-    // by counting unescaped quotes before that position
-    const isInsideQuotes = (str: string, pos: number): boolean => {
-        let inQuote = false
-        let quoteChar = ""
-        for (let i = 0; i < pos && i < str.length; i++) {
-            const c = str[i]
-            if (inQuote) {
-                if (c === quoteChar) inQuote = false
-            } else if (c === '"' || c === "'") {
-                // Check if this quote is part of an attribute (preceded by =)
-                // Look back for = sign
-                let j = i - 1
-                while (j >= 0 && /\s/.test(str[j])) j--
-                if (j >= 0 && str[j] === "=") {
-                    inQuote = true
-                    quoteChar = c
-                }
-            }
-        }
-        return inQuote
-    }
-
     const foreignTagPattern = /<\/?([a-zA-Z][a-zA-Z0-9_]*)[^>]*>/g
     let foreignMatch
     const foreignTags = new Set<string>()
-    const foreignTagPositions: Array<{
-        tag: string
-        start: number
-        end: number
-    }> = []
-
     while ((foreignMatch = foreignTagPattern.exec(fixed)) !== null) {
         const tagName = foreignMatch[1]
-        // Skip if this is a valid draw.io tag
+        if (!validDrawioTags.has(tagName)) {
-        if (validDrawioTags.has(tagName)) continue
+            foreignTags.add(tagName)
-        // Skip if this tag is inside a quoted attribute value
+        }
-        if (isInsideQuotes(fixed, foreignMatch.index)) continue
-
-        foreignTags.add(tagName)
-        foreignTagPositions.push({
-            tag: tagName,
-            start: foreignMatch.index,
-            end: foreignMatch.index + foreignMatch[0].length,
-        })
     }
-
+    if (foreignTags.size > 0) {
-    if (foreignTagPositions.length > 0) {
+        console.log(
-        // Remove tags from end to start to preserve indices
+            "[autoFixXml] Step 8c: Found foreign tags:",
-        foreignTagPositions.sort((a, b) => b.start - a.start)
+            Array.from(foreignTags),
-        for (const { start, end } of foreignTagPositions) {
+        )
-            fixed = fixed.slice(0, start) + fixed.slice(end)
+        for (const tag of foreignTags) {
+            // Remove opening tags (with or without attributes)
+            fixed = fixed.replace(new RegExp(`<${tag}[^>]*>`, "gi"), "")
+            // Remove closing tags
+            fixed = fixed.replace(new RegExp(`</${tag}>`, "gi"), "")
         }
         fixes.push(
             `Removed foreign tags: ${Array.from(foreignTags).join(", ")}`,
@@ -1284,7 +1161,6 @@ export function autoFixXml(xml: string): { fixed: string; fixes: string[] } {
 
     // 10b. Remove extra closing tags (more closes than opens)
     // Need to properly count self-closing tags (they don't need closing tags)
-    // IMPORTANT: Only count tags at element level, NOT inside quoted attribute values
     const tagCounts = new Map<
         string,
         { opens: number; closes: number; selfClosing: number }
@@ -1293,18 +1169,12 @@ export function autoFixXml(xml: string): { fixed: string; fixes: string[] } {
     const fullTagPattern = /<(\/?[a-zA-Z][a-zA-Z0-9]*)[^>]*>/g
     let tagCountMatch
     while ((tagCountMatch = fullTagPattern.exec(fixed)) !== null) {
-        // Skip tags inside quoted attribute values (e.g., value="<b>Title</b>")
-        if (isInsideQuotes(fixed, tagCountMatch.index)) continue
-
         const fullMatch = tagCountMatch[0] // e.g., "<mxCell .../>" or "</mxCell>"
         const tagPart = tagCountMatch[1] // e.g., "mxCell" or "/mxCell"
         const isClosing = tagPart.startsWith("/")
         const isSelfClosing = fullMatch.endsWith("/>")
         const tagName = isClosing ? tagPart.slice(1) : tagPart
 
-        // Only count valid draw.io tags - skip partial/invalid tags like "mx" from streaming
-        if (!validDrawioTags.has(tagName)) continue
-
         let counts = tagCounts.get(tagName)
         if (!counts) {
             counts = { opens: 0, closes: 0, selfClosing: 0 }

package.json

@@ -32,7 +32,6 @@
         "@ai-sdk/google": "^3.0.0",
         "@ai-sdk/openai": "^3.0.0",
         "@ai-sdk/react": "^3.0.1",
-        "@aws-sdk/client-dynamodb": "^3.957.0",
         "@aws-sdk/credential-providers": "^3.943.0",
         "@formatjs/intl-localematcher": "^0.7.2",
         "@langfuse/client": "^4.4.9",

packages/mcp-server/src/xml-validation.ts

@@ -459,8 +459,7 @@ export function autoFixXml(xml: string): { fixed: string; fixes: string[] } {
         fixes.push("Removed quotes around color values in style")
     }
 
-    // 10. Fix unescaped < and > in attribute values
+    // 10. Fix unescaped < in attribute values
-    // < is required to be escaped, > is not strictly required but we escape for consistency
     const attrPattern = /(=\s*")([^"]*?)(<)([^"]*?)(")/g
     let attrMatch
     let hasUnescapedLt = false
@@ -472,10 +471,10 @@ export function autoFixXml(xml: string): { fixed: string; fixes: string[] } {
     }
     if (hasUnescapedLt) {
         fixed = fixed.replace(/=\s*"([^"]*)"/g, (_match, value) => {
-            const escaped = value.replace(/</g, "&lt;").replace(/>/g, "&gt;")
+            const escaped = value.replace(/</g, "&lt;")
             return `="${escaped}"`
         })
-        fixes.push("Escaped <> characters in attribute values")
+        fixes.push("Escaped < characters in attribute values")
     }
 
     // 11. Fix invalid hex character references
@@ -904,30 +903,24 @@ export function validateAndFixXml(xml: string): {
 
 /**
  * Check if mxCell XML output is complete (not truncated).
- * Uses a robust approach that handles any LLM provider's wrapper tags
- * by finding the last valid mxCell ending and checking if suffix is just closing tags.
  * @param xml - The XML string to check (can be undefined/null)
  * @returns true if XML appears complete, false if truncated or empty
  */
 export function isMxCellXmlComplete(xml: string | undefined | null): boolean {
-    const trimmed = xml?.trim() || ""
+    let trimmed = xml?.trim() || ""
     if (!trimmed) return false
 
-    // Find position of last complete mxCell ending (either /> or </mxCell>)
+    // Strip wrapper tags if present
-    const lastSelfClose = trimmed.lastIndexOf("/>")
+    let prev = ""
-    const lastMxCellClose = trimmed.lastIndexOf("</mxCell>")
+    while (prev !== trimmed) {
+        prev = trimmed
+        trimmed = trimmed
+            .replace(/<\/mxParameter>\s*$/i, "")
+            .replace(/<\/invoke>\s*$/i, "")
+            .replace(/<\/antml:parameter>\s*$/i, "")
+            .replace(/<\/antml:invoke>\s*$/i, "")
+            .trim()
+    }
 
-    const lastValidEnd = Math.max(lastSelfClose, lastMxCellClose)
+    return trimmed.endsWith("/>") || trimmed.endsWith("</mxCell>")
-
-    // No valid ending found at all
-    if (lastValidEnd === -1) return false
-
-    // Check what comes after the last valid ending
-    // For />: add 2 chars, for </mxCell>: add 9 chars
-    const endOffset = lastMxCellClose > lastSelfClose ? 9 : 2
-    const suffix = trimmed.slice(lastValidEnd + endOffset)
-
-    // If suffix is empty or only contains closing tags (any provider's wrapper) or whitespace, it's complete
-    // This regex matches any sequence of closing XML tags like </foo>, </bar>, </｜DSML｜xyz>
-    return /^(\s*<\/[^>]+>)*\s*$/.test(suffix)
 }