The existing `wire_format.rs` should share more types with the `codex-protocol` crate (like `AskForApproval` instead of maintaining a parallel `CodexToolCallApprovalPolicy` enum), so this PR moves `wire_format.rs` into `codex-protocol`, renaming it as `mcp-protocol.rs`. We also de-dupe types, where appropriate. --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/openai/codex/pull/2423). * #2424 * __->__ #2423
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.