keep the declared fallback sticky for subsequent managed-tool model rounds
avoid retrying a timed-out primary after every tool result
cover same-provider, different-model policy slots in a regression test
Live evidence
Tiverton’s 2026-08-12 13:00 ET coordinator turn hit the 150s Grok candidate timeout three times in one 10-round managed turn. Each timeout successfully fell back to Haiku, but the next round restarted at Grok, consuming about 450s before completion.
Verification
go test ./internal/proxy -run "TestManagedTurnKeepsFallbackStickyAcrossToolRounds|TestManagedDispatchAdvancesToFallbackOnResponseBodyReadError" -count=1
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Summary
Live evidence
Tiverton’s 2026-08-12 13:00 ET coordinator turn hit the 150s Grok candidate timeout three times in one 10-round managed turn. Each timeout successfully fell back to Haiku, but the next round restarted at Grok, consuming about 450s before completion.
Verification