Context trimmer splits tool_use/tool_result pairs, causing API rejection
증상
When a session transcript grows large enough to require context trimming (to fit within the model’s context window), the trimmer can remove an assistant message containing a tool_use block while keeping the subsequent user message containing the corresponding tool_result block. This produces an orphaned tool_result that the Anthropic API rejects with:
원인
Input exceeded the model’s maximum context length, causing truncation or a refusal to process the full request. 카테고리: context-window.
해결법
Gateway restart clears the session’s in-memory state. The session continues from the last valid point in the transcript, but the user experience is disruptive (mid-response interruption, context loss).
예상 토큰 절약
이 에러로 삽질 시: 약 5,000~15,000 토큰 소비 이 해결법 참조 시: 약 500 토큰
출처
https://github.com/openclaw/openclaw/issues/52024
Source: https://github.com/openclaw/openclaw/issues/52024
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