Unverified50% confidenceFactExact time
The most frequent production-level error in tool calling is responding to a tool call with the wrong ID — Claude reports a 400 unexpected tool_use_id error, and OpenAI reports a 400 no tool output found for function call error.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/10/2026
First Seen
Valid until: 1/8/2027
Sources
Related Entities
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