fix: preserve None content for assistant messages to avoid Anthropic HTTP 400 - #11945
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fix: preserve None content for assistant messages to avoid Anthropic HTTP 400#11945vominh1919 wants to merge 1 commit into
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…HTTP 400 When assistant_message.content is None (tool-call-only response), the previous code converted it to an empty string. Anthropic-compatible proxies reject empty text content blocks with HTTP 400: 'messages: text content blocks must be non-empty'. Fix: preserve None as None when no tool calls are present. Only coalesce to empty string when tool_calls exist (some APIs require non-None content alongside tool_calls). Fixes NousResearch#11906
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Thanks for the contribution, @vominh1919! Closing this as a duplicate of #12470 (by @Sanjays2402), which targets the same fix/feature. We're consolidating on that PR for review. If you want to help push it over the line, please jump in there — or if you think your approach is better for a specific reason that isn't covered in the other PR, let us know and we can reopen. |
This was referenced Aug 3, 2026
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Fixes #11906
When assistant_message.content is None (tool-call-only response), the previous code converted it to an empty string. Anthropic-compatible proxies reject empty text content blocks with HTTP 400:
"messages: text content blocks must be non-empty".Fix: Preserve
NoneasNonewhen no tool calls are present. Only coalesce to empty string whentool_callsexist (some APIs require non-None content alongside tool_calls).Changes:
run_agent.py: Changeassistant_message.content or ""toassistant_message.contentin the message builder