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.