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AIandI0x1
2d0d05a337
When a streaming response is cut mid-tool-call (connection drop, timeout), the accumulated function.arguments is invalid JSON. The mock response builder defaulted finish_reason to 'stop', so the agent loop treated it as a valid completed turn and tried to execute tools with broken args. Fix: validate tool call arguments with json.loads() during mock response reconstruction. If any are invalid JSON, override finish_reason to 'length'. In the main loop's length handler, if tool calls are present, refuse to execute and return partial=True with a clear error instead of silently failing or wasting retries. Also fixes _thinking_exhausted to not short-circuit when tool calls are present — truncated tool calls are not thinking exhaustion. Original cherry-picked from PR #6776 by AIandI0x1. Closes #6638.