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

@@ -173,9 +173,12 @@ async function handleChatRequest(req: Request): Promise<Response> {
             : undefined
 
     // Extract user input text for Langfuse trace
-    const lastMessage = messages[messages.length - 1]
+    // Find the last USER message, not just the last message (which could be assistant in multi-step tool flows)
+    const lastUserMessage = [...messages]
+        .reverse()
+        .find((m: any) => m.role === "user")
     const userInputText =
-        lastMessage?.parts?.find((p: any) => p.type === "text")?.text || ""
+        lastUserMessage?.parts?.find((p: any) => p.type === "text")?.text || ""
 
     // Update Langfuse trace with input, session, and user
     setTraceInput({
@@ -237,9 +240,10 @@ async function handleChatRequest(req: Request): Promise<Response> {
     // Get the appropriate system prompt based on model (extended for Opus/Haiku 4.5)
     const systemMessage = getSystemPrompt(modelId, minimalStyle)
 
-    // Extract file parts (images) from the last message
+    // Extract file parts (images) from the last user message
     const fileParts =
-        lastMessage.parts?.filter((part: any) => part.type === "file") || []
+        lastUserMessage?.parts?.filter((part: any) => part.type === "file") ||
+        []
 
     // User input only - XML is now in a separate cached system message
     const formattedUserInput = `User input:
@@ -248,7 +252,7 @@ ${userInputText}
 """`
 
     // Convert UIMessages to ModelMessages and add system message
-    const modelMessages = convertToModelMessages(messages)
+    const modelMessages = await convertToModelMessages(messages)
 
     // DEBUG: Log incoming messages structure
     console.log("[route.ts] Incoming messages count:", messages.length)
@@ -686,7 +690,8 @@ Call this tool to get shape names and usage syntax for a specific library.`,
                 // Total input = non-cached + cached (these are separate counts)
                 // Note: cacheWriteInputTokens is not available on finish part
                 const totalInputTokens =
-                    (usage.inputTokens ?? 0) + (usage.cachedInputTokens ?? 0)
+                    (usage.inputTokens ?? 0) +
+                    (usage.inputTokenDetails?.cacheReadTokens ?? 0)
                 return {
                     inputTokens: totalInputTokens,
                     outputTokens: usage.outputTokens ?? 0,

components/chat-panel.tsx

@@ -76,6 +76,7 @@ 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
 
 /**
  * Check if auto-resubmit should happen based on tool errors.
@@ -216,6 +217,8 @@ export default function ChatPanel({
 
     // Ref to track consecutive auto-retry count (reset on user action)
     const autoRetryCountRef = useRef(0)
+    // Ref to track continuation retry count (for truncation handling)
+    const continuationRetryCountRef = useRef(0)
 
     // Ref to accumulate partial XML when output is truncated due to maxOutputTokens
     // When partialXmlRef.current.length > 0, we're in continuation mode
@@ -656,15 +659,25 @@ Continue from EXACTLY where you stopped.`,
             if (!shouldRetry) {
                 // No error, reset retry count and clear state
                 autoRetryCountRef.current = 0
+                continuationRetryCountRef.current = 0
                 partialXmlRef.current = ""
                 return false
             }
 
-            // Continuation mode: unlimited retries (truncation continuation, not real errors)
+            // Continuation mode: limited retries for truncation handling
-            // Server limits to 5 steps via stepCountIs(5)
             if (isInContinuationMode) {
-                // Don't count against retry limit for continuation
+                if (
-                // Quota checks still apply below
+                    continuationRetryCountRef.current >=
+                    MAX_CONTINUATION_RETRY_COUNT
+                ) {
+                    toast.error(
+                        `Continuation retry limit reached (${MAX_CONTINUATION_RETRY_COUNT}). The diagram may be too complex.`,
+                    )
+                    continuationRetryCountRef.current = 0
+                    partialXmlRef.current = ""
+                    return false
+                }
+                continuationRetryCountRef.current++
             } else {
                 // Regular error: check retry count limit
                 if (autoRetryCountRef.current >= MAX_AUTO_RETRY_COUNT) {
@@ -684,6 +697,7 @@ Continue from EXACTLY where you stopped.`,
             if (!tokenLimitCheck.allowed) {
                 quotaManager.showTokenLimitToast(tokenLimitCheck.used)
                 autoRetryCountRef.current = 0
+                continuationRetryCountRef.current = 0
                 partialXmlRef.current = ""
                 return false
             }
@@ -692,6 +706,7 @@ Continue from EXACTLY where you stopped.`,
             if (!tpmCheck.allowed) {
                 quotaManager.showTPMLimitToast()
                 autoRetryCountRef.current = 0
+                continuationRetryCountRef.current = 0
                 partialXmlRef.current = ""
                 return false
             }
@@ -1024,6 +1039,7 @@ Continue from EXACTLY where you stopped.`,
     ) => {
         // Reset all retry/continuation state on user-initiated message
         autoRetryCountRef.current = 0
+        continuationRetryCountRef.current = 0
         partialXmlRef.current = ""
 
         const config = getSelectedAIConfig()

package-lock.json

@@ -9,21 +9,21 @@
             "version": "0.4.6",
             "license": "Apache-2.0",
             "dependencies": {
-                "@ai-sdk/amazon-bedrock": "^3.0.70",
+                "@ai-sdk/amazon-bedrock": "^4.0.1",
-                "@ai-sdk/anthropic": "^2.0.44",
+                "@ai-sdk/anthropic": "^3.0.0",
-                "@ai-sdk/azure": "^2.0.69",
+                "@ai-sdk/azure": "^3.0.0",
-                "@ai-sdk/deepseek": "^1.0.30",
+                "@ai-sdk/deepseek": "^2.0.0",
-                "@ai-sdk/gateway": "^2.0.21",
+                "@ai-sdk/gateway": "^3.0.0",
-                "@ai-sdk/google": "^2.0.0",
+                "@ai-sdk/google": "^3.0.0",
-                "@ai-sdk/openai": "^2.0.19",
+                "@ai-sdk/openai": "^3.0.0",
-                "@ai-sdk/react": "^2.0.107",
+                "@ai-sdk/react": "^3.0.1",
                 "@aws-sdk/credential-providers": "^3.943.0",
                 "@formatjs/intl-localematcher": "^0.7.2",
                 "@langfuse/client": "^4.4.9",
                 "@langfuse/otel": "^4.4.4",
                 "@langfuse/tracing": "^4.4.9",
                 "@next/third-parties": "^16.0.6",
-                "@openrouter/ai-sdk-provider": "^1.2.3",
+                "@openrouter/ai-sdk-provider": "^1.5.4",
                 "@opentelemetry/exporter-trace-otlp-http": "^0.208.0",
                 "@opentelemetry/sdk-trace-node": "^2.2.0",
                 "@radix-ui/react-alert-dialog": "^1.1.15",
@@ -38,7 +38,7 @@
                 "@radix-ui/react-tooltip": "^1.1.8",
                 "@radix-ui/react-use-controllable-state": "^1.2.2",
                 "@xmldom/xmldom": "^0.9.8",
-                "ai": "^5.0.89",
+                "ai": "^6.0.1",
                 "base-64": "^1.0.0",
                 "class-variance-authority": "^0.7.1",
                 "clsx": "^2.1.1",
@@ -93,14 +93,14 @@
             }
         },
         "node_modules/@ai-sdk/amazon-bedrock": {
-            "version": "3.0.70",
+            "version": "4.0.1",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/amazon-bedrock/-/amazon-bedrock-3.0.70.tgz",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/amazon-bedrock/-/amazon-bedrock-4.0.1.tgz",
-            "integrity": "sha512-4NIBlwuS/iLKq2ynOqqyJ9imk/oyHuOzhBx88Bfm5I0ihQPKJ0dMMD1IKKuyDZvLRYKmlOEpa//P+/ZBp10drw==",
+            "integrity": "sha512-8Qu5wHTHYTwptZ1L4Sv8hvXMyKRNWUD6dH8wm+Zl8RDOEXZJNENS6zec7u/sWJKuvefL7j+xN8z3IVduhGfxig==",
             "license": "Apache-2.0",
             "dependencies": {
-                "@ai-sdk/anthropic": "2.0.56",
+                "@ai-sdk/anthropic": "3.0.0",
-                "@ai-sdk/provider": "2.0.0",
+                "@ai-sdk/provider": "3.0.0",
-                "@ai-sdk/provider-utils": "3.0.19",
+                "@ai-sdk/provider-utils": "4.0.0",
                 "@smithy/eventstream-codec": "^4.0.1",
                 "@smithy/util-utf8": "^4.0.0",
                 "aws4fetch": "^1.0.20"
@@ -112,48 +112,14 @@
                 "zod": "^3.25.76 || ^4.1.8"
             }
         },
-        "node_modules/@ai-sdk/amazon-bedrock/node_modules/@ai-sdk/provider-utils": {
-            "version": "3.0.19",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/provider-utils/-/provider-utils-3.0.19.tgz",
-            "integrity": "sha512-W41Wc9/jbUVXVwCN/7bWa4IKe8MtxO3EyA0Hfhx6grnmiYlCvpI8neSYWFE0zScXJkgA/YK3BRybzgyiXuu6JA==",
-            "license": "Apache-2.0",
-            "dependencies": {
-                "@ai-sdk/provider": "2.0.0",
-                "@standard-schema/spec": "^1.0.0",
-                "eventsource-parser": "^3.0.6"
-            },
-            "engines": {
-                "node": ">=18"
-            },
-            "peerDependencies": {
-                "zod": "^3.25.76 || ^4.1.8"
-            }
-        },
         "node_modules/@ai-sdk/anthropic": {
-            "version": "2.0.56",
+            "version": "3.0.0",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/anthropic/-/anthropic-2.0.56.tgz",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/anthropic/-/anthropic-3.0.0.tgz",
-            "integrity": "sha512-XHJKu0Yvfu9SPzRfsAFESa+9T7f2YJY6TxykKMfRsAwpeWAiX/Gbx5J5uM15AzYC3Rw8tVP3oH+j7jEivENirQ==",
+            "integrity": "sha512-4BnxkXwRkvh+OB1ze0mHbskT90HL4MNrg6JUsRDkIsU9w5vitvGzxwc/XwlByUGMap/5I8/LZ3XZDzv6KViCuQ==",
             "license": "Apache-2.0",
             "dependencies": {
-                "@ai-sdk/provider": "2.0.0",
+                "@ai-sdk/provider": "3.0.0",
-                "@ai-sdk/provider-utils": "3.0.19"
+                "@ai-sdk/provider-utils": "4.0.0"
-            },
-            "engines": {
-                "node": ">=18"
-            },
-            "peerDependencies": {
-                "zod": "^3.25.76 || ^4.1.8"
-            }
-        },
-        "node_modules/@ai-sdk/anthropic/node_modules/@ai-sdk/provider-utils": {
-            "version": "3.0.19",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/provider-utils/-/provider-utils-3.0.19.tgz",
-            "integrity": "sha512-W41Wc9/jbUVXVwCN/7bWa4IKe8MtxO3EyA0Hfhx6grnmiYlCvpI8neSYWFE0zScXJkgA/YK3BRybzgyiXuu6JA==",
-            "license": "Apache-2.0",
-            "dependencies": {
-                "@ai-sdk/provider": "2.0.0",
-                "@standard-schema/spec": "^1.0.0",
-                "eventsource-parser": "^3.0.6"
             },
             "engines": {
                 "node": ">=18"
@@ -163,31 +129,14 @@
             }
         },
         "node_modules/@ai-sdk/azure": {
-            "version": "2.0.69",
+            "version": "3.0.0",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/azure/-/azure-2.0.69.tgz",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/azure/-/azure-3.0.0.tgz",
-            "integrity": "sha512-0Y+f0XHviWw9ixB2Dkqyg07V67oczUh8adh4B/t0LgVMVkvOsf/WEzfYx2/LDqdvI/o8IYyJ6JzsCKpBwbS61g==",
+            "integrity": "sha512-bY1EfX4aisnpOYcuZkmkuBIUc0noNT/25ZoWispSiMZMS53yF55xkT1SFM+cxDjJ4M3HVJwVuU6r1szA8f9IPA==",
             "license": "Apache-2.0",
             "dependencies": {
-                "@ai-sdk/openai": "2.0.67",
+                "@ai-sdk/openai": "3.0.0",
-                "@ai-sdk/provider": "2.0.0",
+                "@ai-sdk/provider": "3.0.0",
-                "@ai-sdk/provider-utils": "3.0.17"
+                "@ai-sdk/provider-utils": "4.0.0"
-            },
-            "engines": {
-                "node": ">=18"
-            },
-            "peerDependencies": {
-                "zod": "^3.25.76 || ^4.1.8"
-            }
-        },
-        "node_modules/@ai-sdk/azure/node_modules/@ai-sdk/provider-utils": {
-            "version": "3.0.17",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/provider-utils/-/provider-utils-3.0.17.tgz",
-            "integrity": "sha512-TR3Gs4I3Tym4Ll+EPdzRdvo/rc8Js6c4nVhFLuvGLX/Y4V9ZcQMa/HTiYsHEgmYrf1zVi6Q145UEZUfleOwOjw==",
-            "license": "Apache-2.0",
-            "dependencies": {
-                "@ai-sdk/provider": "2.0.0",
-                "@standard-schema/spec": "^1.0.0",
-                "eventsource-parser": "^3.0.6"
             },
             "engines": {
                 "node": ">=18"
@@ -197,14 +146,13 @@
             }
         },
         "node_modules/@ai-sdk/deepseek": {
-            "version": "1.0.30",
+            "version": "2.0.0",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/deepseek/-/deepseek-1.0.30.tgz",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/deepseek/-/deepseek-2.0.0.tgz",
-            "integrity": "sha512-pafNclW9L8Z3WimaRwlpHrGbdeaDE/UklT3rMi2aoRRyrA+s7zGcFuu1zbO2ViLNlKfaS91XZa9MFAPXbIftUA==",
+            "integrity": "sha512-qRX06mouHaF4OePE4S8W8+fLX7Iq4dWk7Ul4+SSPBzx6zBJKUqwHYW2XyPShNWhT4Rcogpl5yHJUrBaOExkiyg==",
             "license": "Apache-2.0",
             "dependencies": {
-                "@ai-sdk/openai-compatible": "1.0.28",
+                "@ai-sdk/provider": "3.0.0",
-                "@ai-sdk/provider": "2.0.0",
+                "@ai-sdk/provider-utils": "4.0.0"
-                "@ai-sdk/provider-utils": "3.0.18"
             },
             "engines": {
                 "node": ">=18"
@@ -214,13 +162,13 @@
             }
         },
         "node_modules/@ai-sdk/gateway": {
-            "version": "2.0.21",
+            "version": "3.0.0",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/gateway/-/gateway-2.0.21.tgz",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/gateway/-/gateway-3.0.0.tgz",
-            "integrity": "sha512-BwV7DU/lAm3Xn6iyyvZdWgVxgLu3SNXzl5y57gMvkW4nGhAOV5269IrJzQwGt03bb107sa6H6uJwWxc77zXoGA==",
+            "integrity": "sha512-JcjePYVpbezv+XOxkxPemwnorjWpgDiiKWMYy6FXTCG2rFABIK2Co1bFxIUSDT4vYO6f1448x9rKbn38vbhDiA==",
             "license": "Apache-2.0",
             "dependencies": {
-                "@ai-sdk/provider": "2.0.0",
+                "@ai-sdk/provider": "3.0.0",
-                "@ai-sdk/provider-utils": "3.0.19",
+                "@ai-sdk/provider-utils": "4.0.0",
                 "@vercel/oidc": "3.0.5"
             },
             "engines": {
@@ -230,15 +178,14 @@
                 "zod": "^3.25.76 || ^4.1.8"
             }
         },
-        "node_modules/@ai-sdk/gateway/node_modules/@ai-sdk/provider-utils": {
+        "node_modules/@ai-sdk/google": {
-            "version": "3.0.19",
+            "version": "3.0.0",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/provider-utils/-/provider-utils-3.0.19.tgz",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/google/-/google-3.0.0.tgz",
-            "integrity": "sha512-W41Wc9/jbUVXVwCN/7bWa4IKe8MtxO3EyA0Hfhx6grnmiYlCvpI8neSYWFE0zScXJkgA/YK3BRybzgyiXuu6JA==",
+            "integrity": "sha512-KFS9pR7KGDyt7p1OQibglS3amoLjCXxwF7DVg+gL2RLcwFRQV0s6Tp7Q+PvGNFSqPdrPYW8mHyvn8ODK4WTImA==",
             "license": "Apache-2.0",
             "dependencies": {
-                "@ai-sdk/provider": "2.0.0",
+                "@ai-sdk/provider": "3.0.0",
-                "@standard-schema/spec": "^1.0.0",
+                "@ai-sdk/provider-utils": "4.0.0"
-                "eventsource-parser": "^3.0.6"
             },
             "engines": {
                 "node": ">=18"
@@ -247,90 +194,14 @@
                 "zod": "^3.25.76 || ^4.1.8"
             }
         },
-        "node_modules/@ai-sdk/google": {
-            "version": "2.0.0",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/google/-/google-2.0.0.tgz",
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-            "license": "Apache-2.0",
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-                "@ai-sdk/provider": "2.0.0",
-                "@ai-sdk/provider-utils": "3.0.0"
-            },
-            "engines": {
-                "node": ">=18"
-            },
-            "peerDependencies": {
-                "zod": "^3.25.76 || ^4"
-            }
-        },
-        "node_modules/@ai-sdk/google/node_modules/@ai-sdk/provider-utils": {
-            "version": "3.0.0",
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         "node_modules/@ai-sdk/openai": {
-            "version": "2.0.67",
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-            "resolved": "https://registry.npmjs.org/@ai-sdk/openai/-/openai-2.0.67.tgz",
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             "license": "Apache-2.0",
             "dependencies": {
-                "@ai-sdk/provider": "2.0.0",
+                "@ai-sdk/provider": "3.0.0",
-                "@ai-sdk/provider-utils": "3.0.17"
+                "@ai-sdk/provider-utils": "4.0.0"
-            },
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-                "node": ">=18"
-            },
-            "peerDependencies": {
-                "zod": "^3.25.76 || ^4.1.8"
-            }
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-            "license": "Apache-2.0",
-            "dependencies": {
-                "@ai-sdk/provider": "2.0.0",
-                "@ai-sdk/provider-utils": "3.0.18"
-            },
-            "engines": {
-                "node": ">=18"
-            },
-            "peerDependencies": {
-                "zod": "^3.25.76 || ^4.1.8"
-            }
-        },
-        "node_modules/@ai-sdk/openai/node_modules/@ai-sdk/provider-utils": {
-            "version": "3.0.17",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/provider-utils/-/provider-utils-3.0.17.tgz",
-            "integrity": "sha512-TR3Gs4I3Tym4Ll+EPdzRdvo/rc8Js6c4nVhFLuvGLX/Y4V9ZcQMa/HTiYsHEgmYrf1zVi6Q145UEZUfleOwOjw==",
-            "license": "Apache-2.0",
-            "dependencies": {
-                "@ai-sdk/provider": "2.0.0",
-                "@standard-schema/spec": "^1.0.0",
-                "eventsource-parser": "^3.0.6"
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                 "node": ">=18"
@@ -340,9 +211,9 @@
             }
         },
         "node_modules/@ai-sdk/provider": {
-            "version": "2.0.0",
+            "version": "3.0.0",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/provider/-/provider-2.0.0.tgz",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/provider/-/provider-3.0.0.tgz",
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@@ -4036,28 +3901,12 @@
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@@ -10456,7 +10288,7 @@
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-            "resolved": "https://registry.npmmirror.com/postject/-/postject-1.0.0-alpha.6.tgz",
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@@ -16058,7 +15919,7 @@
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@@ -17950,7 +17811,7 @@
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package.json

@@ -24,21 +24,21 @@
         "dist:all": "npm run electron:build && npm run electron:prepare && npx electron-builder --mac --win --linux"
     },
     "dependencies": {
-        "@ai-sdk/amazon-bedrock": "^3.0.70",
+        "@ai-sdk/amazon-bedrock": "^4.0.1",
-        "@ai-sdk/anthropic": "^2.0.44",
+        "@ai-sdk/anthropic": "^3.0.0",
-        "@ai-sdk/azure": "^2.0.69",
+        "@ai-sdk/azure": "^3.0.0",
-        "@ai-sdk/deepseek": "^1.0.30",
+        "@ai-sdk/deepseek": "^2.0.0",
-        "@ai-sdk/gateway": "^2.0.21",
+        "@ai-sdk/gateway": "^3.0.0",
-        "@ai-sdk/google": "^2.0.0",
+        "@ai-sdk/google": "^3.0.0",
-        "@ai-sdk/openai": "^2.0.19",
+        "@ai-sdk/openai": "^3.0.0",
-        "@ai-sdk/react": "^2.0.107",
+        "@ai-sdk/react": "^3.0.1",
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-        "@openrouter/ai-sdk-provider": "^1.2.3",
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@@ -53,7 +53,7 @@
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         "@xmldom/xmldom": "^0.9.8",
-        "ai": "^5.0.89",
+        "ai": "^6.0.1",
         "base-64": "^1.0.0",
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@@ -111,5 +111,10 @@
         "tailwindcss": "^4",
         "typescript": "^5",
         "wait-on": "^9.0.3"
+    },
+    "overrides": {
+        "@openrouter/ai-sdk-provider": {
+            "ai": "^6.0.1"
+        }
     }
 }