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## Why Model catalog responses can now advertise a nullable `default_service_tier` for each model. Codex needs to preserve three distinct states all the way from config/app-server inputs to inference: - no explicit service tier, so the client may apply the current model catalog default when FastMode is enabled - explicit `default`, meaning the user intentionally wants standard routing - explicit catalog tier ids such as `priority`, `flex`, or future tiers Keeping those states distinct prevents the UI from showing one tier while core sends another, especially after model switches or app-server `thread/start` / `turn/start` updates. ## What Changed - Plumbed `default_service_tier` through model catalog protocol types, app-server model responses, generated schemas, model cache fixtures, and provider/model-manager conversions. - Added the request-only `default` service tier sentinel and normalized legacy config spelling so `fast` in `config.toml` still materializes as the runtime/request id `priority`. - Moved catalog default resolution to the TUI/client side, including recomputing the effective service tier when model/FastMode-dependent surfaces change. - Updated app-server thread lifecycle config construction so `serviceTier: null` preserves explicit standard-routing intent by mapping to `default` instead of internal `None`. - Kept core responsible for validating explicit tiers against the current model and stripping `default` before `/v1/responses`, without applying catalog defaults itself. ## Validation - `CARGO_INCREMENTAL=0 cargo build -p codex-cli` - `CARGO_INCREMENTAL=0 cargo test -p codex-app-server model_list` - `cargo test -p codex-tui service_tier` - `cargo test -p codex-protocol service_tier_for_request` - `cargo test -p codex-core get_service_tier` - `RUST_MIN_STACK=8388608 CARGO_INCREMENTAL=0 cargo test -p codex-core service_tier`
codex-protocol
This crate defines the "types" for the protocol used by Codex CLI, which includes both "internal types" for communication between codex-core and codex-tui, as well as "external types" used with codex app-server.
This crate should have minimal dependencies.
Ideally, we should avoid "material business logic" in this crate, as we can always introduce Ext-style traits to add functionality to types in other crates.