Owen Lin
14df0e8833
## What Introduce a `CodexResponsesMetadata` struct that defines all the core metadata we send to Responses API. Example fields are `thread_id`, `turn_id`, `window_id`, etc. Going forward, `client_metadata["x-codex-turn-metadata"]` will be the canonical way Codex sends metadata to Responses API across both HTTP and websocket transports. For now, we continue to emit the existing top-level HTTP headers and top-level `client_metadata` fields from the same `CodexResponsesMetadata` struct for compatibility reasons. Also, app-server clients who specify additional `responsesapi_client_metadata` via `turn/start` and `turn/steer` will have those fields merged into `client_metadata["x-codex-turn-metadata"]`, but cannot override the reserved fields that core uses (i.e. the fields in `CodexResponsesMetadata`). ## Why Responses API request instrumentation is the source of truth for downstream Codex analytics that join requests by Codex IDs such as session, thread, turn, and context window. Before this change, those values were assembled through several request-specific paths: HTTP request bodies, websocket handshake headers, websocket `response.create` payloads, compaction requests, and the rich `x-codex-turn-metadata` envelope all had their own wiring. That made metadata propagation easy to drift across API-key/direct Responses API requests, ChatGPT-auth/proxied requests, websocket requests, and compaction requests. It also made additions like `window_id` error-prone because a field could be added to one transport projection but missed in another. ## What changed - Added `CodexResponsesMetadata` as the core-owned snapshot for Codex metadata sent to ResponsesAPI. - Render `client_metadata["x-codex-turn-metadata"]`, flat `client_metadata` projections, and direct compatibility headers from that same snapshot. - Include the known Codex-owned fields in the turn metadata blob, including installation/session/thread/turn/window IDs, request kind, lineage, sandbox/workspace metadata, timing, and compaction details. - Treat app-server `responsesapi_client_metadata` as enrichment for the Codex turn metadata blob while preventing those extras from overriding Codex-owned fields. - Use the same metadata path for normal turns, websocket prewarm, local compaction, remote v1 compaction, and remote v2 compaction. - Keep websocket connection-only preconnect metadata separate so handshakes carry compatibility identity headers without inventing a fake turn metadata blob. ## Verification - `cargo check -p codex-core` - `just fix -p codex-core`
codex-core
This crate implements the business logic for Codex. It is designed to be used by the various Codex UIs written in Rust.
Dependencies
Note that codex-core makes some assumptions about certain helper utilities being available in the environment. Currently, this support matrix is:
macOS
Expects /usr/bin/sandbox-exec to be present.
When using the workspace-write sandbox policy, the Seatbelt profile allows
writes under the configured writable roots while keeping .git (directory or
pointer file), the resolved gitdir: target, and .codex read-only.
Network access and filesystem read/write roots are controlled by
SandboxPolicy. Seatbelt consumes the resolved policy and enforces it.
Seatbelt also keeps the legacy default preferences read access
(user-preference-read) needed for cfprefs-backed macOS behavior.
Linux
Expects the binary containing codex-core to run the equivalent of codex sandbox when arg0 is codex-linux-sandbox. See the codex-arg0 crate for details.
Legacy SandboxPolicy / sandbox_mode configs are still supported on Linux.
They can continue to use the legacy Landlock path when the split filesystem
policy is sandbox-equivalent to the legacy model after cwd resolution.
Split filesystem policies that need direct FileSystemSandboxPolicy
enforcement, such as read-only or denied carveouts under a broader writable
root, automatically route through bubblewrap. The legacy Landlock path is used
only when the split filesystem policy round-trips through the legacy
SandboxPolicy model without changing semantics. That includes overlapping
cases like /repo = write, /repo/a = none, /repo/a/b = write, where the
more specific writable child must reopen under a denied parent.
The Linux sandbox helper prefers the first bwrap found on PATH outside the
current working directory whenever it is available. If bwrap is present but
too old to support --argv0, the helper keeps using system bubblewrap and
switches to a no---argv0 compatibility path for the inner re-exec. If
bwrap is missing, it falls back to the bundled codex-resources/bwrap
binary shipped with Codex and Codex surfaces a startup warning through its
normal notification path instead of printing directly from the sandbox helper.
Codex also surfaces a startup warning when bubblewrap cannot create user
namespaces. WSL2 uses the normal Linux bubblewrap path. WSL1 is not supported
for bubblewrap sandboxing because it cannot create the required user
namespaces, so Codex rejects sandboxed shell commands that would enter the
bubblewrap path before invoking bwrap.
Windows
Legacy SandboxPolicy / sandbox_mode configs are still supported on
Windows. Legacy read-only and workspace-write policies imply full
filesystem read access; exact readable roots are represented by split
filesystem policies instead.
The elevated Windows sandbox also supports:
- legacy
ReadOnlyandWorkspaceWritebehavior - split filesystem policies that need exact readable roots, exact writable roots, or extra read-only carveouts under writable roots
- backend-managed system read roots required for basic execution, such as
C:\Windows,C:\Program Files,C:\Program Files (x86), andC:\ProgramData, when a split filesystem policy requests platform defaults
The unelevated restricted-token backend still supports the legacy full-read
Windows model for legacy ReadOnly and WorkspaceWrite behavior. It also
supports a narrow split-filesystem subset: full-read split policies whose
writable roots still match the legacy WorkspaceWrite root set, but add extra
read-only carveouts under those writable roots.
New [permissions] / split filesystem policies remain supported on Windows
only when they can be enforced directly by the selected Windows backend or
round-trip through the legacy SandboxPolicy model without changing semantics.
Policies that would require direct explicit unreadable carveouts (none) or
reopened writable descendants under read-only carveouts still fail closed
instead of running with weaker enforcement.
All Platforms
Expects the binary containing codex-core to simulate the virtual
apply_patch CLI when arg1 is --codex-run-as-apply-patch. See the
codex-arg0 crate for details.