Restrict spawned-agent models to the active backend#32751
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copyberry[bot] merged 1 commit intoJul 13, 2026
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## Why Model overrides for `spawn_agent` must be compatible with the multi-agent backend used by the current turn. ## What changed - Carry each model's multi-agent backend metadata into `ModelPreset`. - Filter the advertised `spawn_agent` model overrides for multi-agent v2 and reject overrides assigned to another backend. - Limit error suggestions to picker-visible, backend-compatible models. ## Testing Added coverage for hiding incompatible models from the tool description and rejecting them during spawn validation. GitOrigin-RevId: 22c12aba67df46e9743a74f019b72a1b8b76b308
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Restrict spawned-agent models to the active backend
Why
Model overrides for
spawn_agentmust be compatible with the multi-agent backend used by the current turn.What changed
ModelPreset.spawn_agentmodel overrides for multi-agent v2 and reject overrides assigned to another backend.Testing
Added coverage for hiding incompatible models from the tool description and rejecting them during spawn validation.