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fix(provider): assistant messages with tool calls missing reasoning_content on Kimi K2.6 #23828
Description
Description
When using Kimi K2.6 (via OpenAI-compatible provider) with , long conversations fail during history replay with:
thinking is enabled but reasoning_content is missing in assistant tool call message at index X
Root cause
in only adds when:
- Assistant message actually contains reasoning parts, OR
- Message is after the last user turn
Historical assistant messages that contain tool calls but no reasoning are missed, violating API requirements.
Fix
Force empty on all interleaved assistant messages containing tool calls:
Reference implementation: https://github.com/fkyah3/opencode-fkyah3/commit/d14da0b74
Verification
Tested in dev mode with multi-turn tool call conversations (git commands + document summarization). History replay no longer triggers the error.
Related
- Vercel AI SDK PR Version 1.1.50 broke @ai-sdk/openai-compatible auth #12049 (similar fix in SDK, but incomplete for empty reasoning)
- AI SDK Issue Not started after install #14071 (reasoning block validation)
Activity
github-actions commentedon Apr 22, 2026
This issue might be a duplicate of existing issues. Please check:
reasoning_contentfor interleaved modelsreasoning_contentfor tool-call assistant messages with interleaved modelsreasoning_contenton Kimi K2.6reasoning_contentfor interleaved models (Kimi K2.6)Please check these issues to see if your report is already covered. If so, consider closing this one and contributing to the existing discussion.