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## Why Some MCP OAuth providers require a pre-registered public client ID and cannot rely on dynamic client registration. Codex already supports MCP OAuth, but it had no way to supply that client ID from config into the PKCE flow. ## What changed - add `oauth.client_id` under `[mcp_servers.<server>]` config, including config editing and schema generation - thread the configured client ID through CLI, app-server, plugin login, and MCP skill dependency OAuth entrypoints - configure RMCP authorization with the explicit client when present, while preserving the existing dynamic-registration path when it is absent - add focused coverage for config parsing/serialization and OAuth URL generation ## Verification - `cargo test -p codex-config -p codex-rmcp-client -p codex-mcp -p codex-core-plugins` - `cargo test -p codex-core blocking_replace_mcp_servers_round_trips --lib` - `cargo test -p codex-core replace_mcp_servers_streamable_http_serializes_oauth_resource --lib` - `cargo test -p codex-core config_schema_matches_fixture --lib` ## Notes Broader local package runs still hit unrelated pre-existing stack overflows in: - `codex-app-server::in_process_start_clamps_zero_channel_capacity` - `codex-core::resume_agent_from_rollout_uses_edge_data_when_descendant_metadata_source_is_stale`
npm i -g @openai/codex
or brew install --cask codex
Codex CLI is a coding agent from OpenAI that runs locally on your computer.
If you want Codex in your code editor (VS Code, Cursor, Windsurf), install in your IDE.
If you want the desktop app experience, run
codex app or visit the Codex App page.
If you are looking for the cloud-based agent from OpenAI, Codex Web, go to chatgpt.com/codex.
Quickstart
Installing and running Codex CLI
Install globally with your preferred package manager:
# Install using npm
npm install -g @openai/codex
# Install using Homebrew
brew install --cask codex
Then simply run codex to get started.
You can also go to the latest GitHub Release and download the appropriate binary for your platform.
Each GitHub Release contains many executables, but in practice, you likely want one of these:
- macOS
- Apple Silicon/arm64:
codex-aarch64-apple-darwin.tar.gz - x86_64 (older Mac hardware):
codex-x86_64-apple-darwin.tar.gz
- Apple Silicon/arm64:
- Linux
- x86_64:
codex-x86_64-unknown-linux-musl.tar.gz - arm64:
codex-aarch64-unknown-linux-musl.tar.gz
- x86_64:
Each archive contains a single entry with the platform baked into the name (e.g., codex-x86_64-unknown-linux-musl), so you likely want to rename it to codex after extracting it.
Using Codex with your ChatGPT plan
Run codex and select Sign in with ChatGPT. We recommend signing into your ChatGPT account to use Codex as part of your Plus, Pro, Business, Edu, or Enterprise plan. Learn more about what's included in your ChatGPT plan.
You can also use Codex with an API key, but this requires additional setup.
Docs
This repository is licensed under the Apache-2.0 License.