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fix(ai): preserve Mistral and Cohere system parts - #52890
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Oct 7, 2026
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Issue for this PR
No linked issue.
Type of change
What does this PR do?
Preserve multiple initial system text parts as ordered content arrays in native Mistral Chat and Cohere Chat instead of joining them with added newlines. Update Mistral's system-message schema to accept text arrays. Single-part requests retain their string shape, and absent system instructions remain omitted. OpenAI-compatible routes and chronological system updates are unchanged.
How did you verify your code works?
bun test test/provider/mistral-chat.test.ts test/provider/cohere.test.ts test/provider/mistral.recorded.test.ts test/provider/cohere.recorded.test.ts: 37 pass.bun run check: passed with existing repository lint warnings.Screenshots / recordings
Not applicable; request payload change only.
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