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[FEATURE]: Mistral Provider: Support x-affinity header for session continuation #11466
Description
Feature hasn't been suggested before.
- I have verified this feature I'm about to request hasn't been suggested before.
Describe the enhancement you want to request
The official mistral-vibe CLI uses the x-affinity header to track and continue sessions. This seems to be similar to promptCaching in the OpenAI provider for example.
The session_id passed to x-affinity is a UUID4, the session id used or promptCaching in OpenCode is a based on a timestamp, so maybe it's not compatible out of the box, but worth a try.
Here is some evidence:
https://github.com/mistralai/mistral-vibe/blob/9809cfc8315049b6f02b1865306903d92428919f/vibe/core/agent_loop.py#L587
https://github.com/mistralai/mistral-vibe/blob/9809cfc8315049b6f02b1865306903d92428919f/vibe/core/agent_loop.py#L156
https://github.com/mistralai/mistral-vibe/blob/9809cfc8315049b6f02b1865306903d92428919f/vibe/cli/textual_ui/app.py#L1242
Reacted by Kostadin Damyanov
Activity
github-actions commentedon Jan 31, 2026
Based on a review of existing issues, I don't see a direct duplicate of this feature request.
However, there are some related issues worth checking:
The x-affinity header for Mistral is a specific implementation of session continuation that differs from Anthropic's prompt caching approach. This seems like a new feature request that addresses Mistral's specific session continuation mechanism.
github-actions commentedon Apr 2, 2026
To stay organized issues are automatically closed after 90 days of no activity. If the issue is still relevant please open a new one.
sdroege commentedon Apr 2, 2026
This is still relevant
fmflurry commentedon Jun 3, 2026
Where are we with this feature ?
kostadin-damyanov-prime commentedon Jul 4, 2026
@thdxr Can we reopen this issue? I believe that it is still relevant.
fmflurry commentedon Jul 4, 2026
If you want to use it already, copy paste this plugin I made: fmflurry/harness-manifesto@6deeab7
kostadin-damyanov-prime commentedon Jul 5, 2026
Thank you @fmflurry I will try it!
nanosek commentedon Jul 13, 2026
I would also be interested in getting this fixed - my manual workaround is to set it in opencode.json to a hardcoded GUID to get some meaningful caching hits at all when using mistral, but that has probably other drawbacks