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66bd0e5493
* feat: add append_diagram tool for truncation continuation When LLM output hits maxOutputTokens mid-generation, instead of failing with an error loop, the system now: 1. Detects truncation (missing </root> in XML) 2. Stores partial XML and tells LLM to use new append_diagram tool 3. LLM continues generating from where it stopped 4. Fragments are accumulated until XML is complete 5. Server limits to 5 steps via stepCountIs(5) Key changes: - Add append_diagram tool definition in route.ts - Add append_diagram handler in chat-panel.tsx - Track continuation mode separately from error mode - Continuation mode has unlimited retries (not counted against limit) - Error mode still limited to MAX_AUTO_RETRY_COUNT (1) - Update system prompts to document append_diagram tool * fix: show friendly message and yellow badge for truncated output - Add yellow 'Truncated' badge in UI instead of red 'Error' when XML is incomplete - Show friendly error message for toolUse.input is invalid errors - Built on top of append_diagram continuation feature * refactor: remove debug logs and simplify truncation state - Remove all debug console.log statements - Remove isContinuationModeRef, derive from partialXmlRef.current.length > 0 * docs: fix append_diagram instructions for consistency - Change 'Do NOT include' to 'Do NOT start with' (clearer intent) - Add <mxCell id="0"> to prohibited start patterns - Change 'closing tags </root></mxGraphModel>' to just '</root>' (wrapWithMxFile handles the rest)