Errors
SESSION_TURN_RESULT_ARTIFACT_UNAVAILABLE
Prepared result evidence for a recovering durable Agent Session turn is missing or mismatched.
What failed
Recovery for a Session turn could not load the private prepared result artifact that matches the durable checkpoint.
Why
After preparation, recovery must reuse the write-once result rather than re-running the provider, Tools, effects, or Thread publication. Missing or mismatched artifacts make safe replay impossible.
What still works
Other completed turns and Sessions remain available. Inspection exposes only the stable code and operator next step—not prompts, outputs, or credentials.
Fix
Restore the Runtime result store from a consistent backup that includes the Session checkpoint and prepared artifacts, then retry the turn through the normal worker path.