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Add a turn-scoped service tier override (#40616)

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## What changed

- Add `serviceTierForTurn` to `turn/start` so a newly started turn can override the service tier without changing the thread's saved tier.
- Treat `"default"` as standard speed and omitted or `null` values as inheriting the thread tier.
- Keep `serviceTier` authoritative for subsequent turns when both fields are supplied, and ignore the turn-scoped override when steering an active turn.

## Testing

- Extend the app-server turn-start test to verify both the one-turn `"default"` override and inheritance on the following turn.

GitOrigin-RevId: 4c2c4db21d8d31617a7a6e6df65bf54834e72383
This commit is contained in:
chess
2026-08-25 14:04:32 +00:00
committed by copyberry
parent d7510aa4b4
commit ed42068c45
21 changed files with 86 additions and 3 deletions
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codex-rs/protocol/src/turn_input.rs
+2
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@@ -146,6 +146,8 @@ pub struct TurnStartOptions {
/// Structured-output schema for a new turn. When steering, Core rejects
/// the input if the active turn uses a different schema.
pub final_output_json_schema: Option<Value>,
/// Service tier for a new turn, without changing the thread's preference.
pub service_tier: Option<String>,
/// Parent turn lineage recorded if this request starts a new turn.
pub parent_turn_id: Option<String>,
/// Causal root turn lineage recorded if this request starts a new turn.