# Compatibility surface

The source snapshot's generated TypeScript and Rust definitions are under `vendor/codex-app-server-protocol`. Runtime handling is structural so the bridge can tolerate additive fields.

## Implemented client requests

- `initialize`
- `model/list`
- `account/read`
- `config/read`
- `features/list`
- `thread/start`
- `thread/resume`
- `thread/fork`
- `thread/list`
- `thread/read`
- `thread/subscribe`
- `thread/unsubscribe`
- `thread/name/set`
- `thread/archive`
- `thread/unarchive`
- `thread/delete`
- `thread/compact/start`
- `thread/goal/get`
- `thread/goal/set`
- `thread/goal/clear`
- `turn/start`
- `turn/steer`
- `turn/interrupt`
- `command/exec`
- restricted `fs/readFile`, `fs/listDirectory`, `fs/stat`, `fs/writeFile`, `fs/createDirectory`, and `fs/remove`

The router also returns schema-shaped empty collections for startup discovery requests concerning skills, plugins, apps, connectors, MCP status, collaboration modes, and experimental features.

## Implemented client notification

- `initialized`

## Emitted server notifications

- `thread/started`
- `thread/name/updated`
- `thread/compacted`
- `thread/goal/updated`
- `thread/goal/cleared`
- `turn/started`
- `item/started`
- `item/agentMessage/delta`
- reasoning delta variants
- `turn/plan/updated`
- `item/commandExecution/outputDelta`
- `item/mcpToolCall/progress`
- `item/fileChange/patchUpdated`
- `turn/diff/updated`
- `item/completed`
- `turn/completed`
- `notice`, `warning`, and `error`

## Emitted server requests

- `item/commandExecution/requestApproval`
- `item/fileChange/requestApproval`
- `item/tool/requestUserInput`

## Deliberately not claimed yet

- Codex cloud tasks or OpenAI account authentication.
- Exact Codex kernel/Seatbelt sandbox semantics.
- Every integrated-terminal/process method.
- ChatGPT connector or marketplace behavior.
- Direct mobile-to-OMP pairing without the desktop host.

A captured ChatGPT desktop session should determine which of the remaining methods must be added for that concrete app release.