fix: preserve None content on tool-call-only assistant messages (#11906) - #11924
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fix: preserve None content on tool-call-only assistant messages (#11906)#11924kagura-agent wants to merge 1 commit into
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…Research#11906) When the model returns a tool-call-only response with content=None, the content was being normalized to empty string '', which causes HTTP 400 on Anthropic-compatible proxies ('text content blocks must be non-empty'). Keep content as None in conversation history dicts so the API client serializes it as null. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Closing to reduce PR volume — I had too many open PRs. Apologies for the noise. |
This was referenced Aug 3, 2026
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Problem
Empty assistant content (None) gets normalized to empty string
'', which causes HTTP 400 on Anthropic-compatible proxies ('text content blocks must be non-empty'). This happens when the model returns a tool-call-only response.Fix
Three-layer normalization to prevent empty text blocks:
run_agent.py(storage): Normalize empty string to None when storing assistant messagesrun_agent.py(API prep): Strip empty assistant content before sending to API (2 locations)anthropic_adapter.py: Normalize in Anthropic message conversion as defensive guardTests
Fixes #11906