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[Kimi K2.6] reasoning_content is missing in assistant tool call messages #29619
Description
Description
Summary
When using OpenCode with Kimi K2.6, tool calls fail with:
[Moonshot AI] thinking is enabled but reasoning_content is missing in assistant tool call message at index N
Environment
- OpenCode: latest
- Provider: Moonshot AI / Kimi K2.6
- Model: kimi-k2.6
- Thinking mode: enabled
- Tool calls: enabled
Steps to reproduce
- Use Kimi K2.6 with thinking enabled.
- Ask the agent to perform a task that requires tool calls.
- After the first assistant/tool-call roundtrip, the next request fails.
Expected behavior
OpenCode should preserve and resend reasoning_content in assistant messages that contain tool calls.
Actual behavior
Moonshot rejects the request because reasoning_content is missing from the assistant tool call message.
Notes
This appears to happen specifically with Kimi K2.6 and tool calling.
The issue seems related to reasoning-content preservation across the tool-call roundtrip.
Plugins
Warp
OpenCode version
1.15.11
Steps to reproduce
No response
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Operating System
Ubuntu 22.04
Terminal
Warp
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github-actions commentedon May 27, 2026
This issue might be a duplicate of existing issues. Please check:
reasoning_contentin tool call message historyreasoning_contentnot passed back for tool call turns (same root cause pattern)If your issue is specific to a different scenario or version, please add details clarifying how it differs from the above.
rekram1-node commentedon May 27, 2026
can u send the session?
opencode export > session.json
do not run /export
MrCh1ppy commentedon Jun 2, 2026
I’ve seen at least five issues regarding the same problem, and there are quite a few pull requests as well. It’s strange that these PRs still haven’t been reviewed.
rekram1-node commentedon Jun 2, 2026
@MrCh1ppy thats because vast majority of PRs:
MrCh1ppy commentedon Jun 3, 2026
I understand that many PRs may not actually fix the issue.
But #25011 seems to target the Moonshot/Kimi message-format problem and was closed by automated cleanup without review.
So this still looks like a maintainer review/backlog problem, not only a PR quality problem.
rekram1-node commentedon Jun 3, 2026
That was my own PR haha and it's not a fix for this issue it's a separate one and I havent flushed it out yet
github-actions commentedon Aug 3, 2026
To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.