Problem
During a long Mistral Vibe session in Air, a turn ran for 60 s and then failed with a raw pydantic validation error. Every later prompt in the same session failed within 29 ms with "Core rejected durable input ... invalid_state ... state='running'". The session can no longer be used.
Cause
The issue is related to a known bug in Mistral Vibe 3.1.0, tracked as mistral-vibe#1451, which is planned to be fixed in the next release.
Resolution
Start a new session in Air. The broken step is specific to the session where the error occurred; new sessions are not impacted and should work normally.
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