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## Why Some models need to select their code-execution behavior through model catalog metadata. Models without that metadata must continue to follow the existing `CodeMode` and `CodeModeOnly` feature flags, including when a newer server sends an enum value this client does not recognize. ## What changed - add optional `ModelInfo.tool_mode` metadata with `direct`, `code_mode`, and `code_mode_only` - treat omitted and unknown wire values as `None` - resolve `None` from the existing feature flags - carry the resolved `ToolMode` directly on `TurnContext`, outside `Config` - use the resolved value for turn creation, model switches, review turns, tool planning, and code execution ## Coverage - add protocol coverage for omitted, known, and unknown enum values - add focused coverage for flag fallback and explicit metadata overriding feature flags - add core integration coverage that fetches remote model metadata through `/v1/models` and verifies the outbound `/responses` tools for explicit `direct` and `code_mode_only` selectors ## Stack - followed by #25032