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## Why `PermissionProfile` should describe filesystem roots as absolute paths at the type level. Using `PathBuf` in `FileSystemPermissions` made the shared type too permissive and blurred together three different deserialization cases: - skill metadata in `agents/openai.yaml`, where relative paths should resolve against the skill directory - app-server API payloads, where callers should have to send absolute paths - local tool-call payloads for commands like `shell_command` and `exec_command`, where `additional_permissions.file_system` may legitimately be relative to the command `workdir` This change tightens the shared model without regressing the existing local command flow. ## What Changed - changed `protocol::models::FileSystemPermissions` and the app-server `AdditionalFileSystemPermissions` mirror to use `AbsolutePathBuf` - wrapped skill metadata deserialization in `AbsolutePathBufGuard`, so relative permission roots in `agents/openai.yaml` resolve against the containing skill directory - kept app-server/API deserialization strict, so relative `additionalPermissions.fileSystem.*` paths are rejected at the boundary - restored cwd/workdir-relative deserialization for local tool-call payloads by parsing `shell`, `shell_command`, and `exec_command` arguments under an `AbsolutePathBufGuard` rooted at the resolved command working directory - simplified runtime additional-permission normalization so it only canonicalizes and deduplicates absolute roots instead of trying to recover relative ones later - updated the app-server schema fixtures, `app-server/README.md`, and the affected transport/TUI tests to match the final behavior
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.