fix: skip incomplete tool calls with partialJson in session repair#5822
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When streaming is aborted mid-tool-call, the assistant message contains a toolCall with partialJson (incomplete arguments) instead of complete arguments. The repair logic was creating synthetic tool_results for these incomplete calls, but since the incomplete tool_use blocks are skipped during API conversion, this caused "unexpected tool_use_id" errors from the Anthropic API. This fix updates extractToolCallsFromAssistant() to skip tool calls that have partialJson but no arguments field, preventing synthetic results from being created for tool calls that won't be sent to the API. Co-Authored-By: Claude Opus 4.5 <[email protected]>
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This was referenced Feb 13, 2026
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Summary
When streaming is aborted mid-tool-call, the assistant message contains a
toolCallwithpartialJson(incomplete arguments) instead of completearguments. The repair logic was creating synthetictool_resultsfor these incomplete calls, but since the incompletetool_useblocks are skipped during API conversion, this caused "unexpected tool_use_id" errors from the Anthropic API.Changes
extractToolCallsFromAssistant()to skip tool calls that havepartialJsonbut noargumentsfieldTest plan
Greptile Overview
Greptile Summary
This PR updates the session transcript repair logic to ignore incomplete streamed tool calls that contain
partialJsonbut noarguments. This prevents the repair step from inserting synthetictoolResultmessages for tool calls that will later be omitted during Anthropic API conversion, avoiding "unexpected tool_use_id" validation errors. Two Vitest cases were added to cover skipping incomplete tool calls and ensuring synthetic results are still generated for complete calls.Confidence Score: 5/5
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dashboard- CLAUDE.md (source)dashboard- AGENTS.md (source)