It turns out that we want slightly different behavior for the `SetDefaultModel` RPC because some models do not work with reasoning (like GPT-4.1), so we should be able to explicitly clear this value. Verified in `codex-rs/mcp-server/tests/suite/set_default_model.rs`.
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 mcp.
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.