## Why MCP servers currently come from user config, local plugins, compatibility Apps synthesis, and host extensions. Those sources were composed by mutating a shared map, leaving registration identity, precedence, removal, and provenance implicit in assembly order. Before adding executor-owned MCPs, Codex needs one durable resolution boundary above `McpConnectionManager`. This PR introduces that boundary while preserving current server configuration, policy, and runtime behavior. Executor-scoped registrations and explicit policy layers remain follow-ups. ## What changed - Add typed `McpServerRegistration` inputs and an immutable `ResolvedMcpCatalog` in `codex-mcp`. - Retain each registration's complete `McpServerConfig`, including its environment binding, while recording its source and provenance. - Preserve the existing structural precedence between plugin, config, compatibility, and ordered extension sources. - Resolve equal-precedence actions by contribution order; provenance IDs are used only for diagnostics and cannot affect the winner. - Preserve extension removals and the existing name-scoped `enabled = false` veto. - Report same-tier conflicts with every contender and the final catalog outcome, including whether the winning action registers or removes the server. - Require MCP contributors to provide a stable diagnostic identity. - Derive materialized server maps and plugin ownership from the resolved catalog. `McpConnectionManager`, transport startup, tool calls, and resource routing continue to consume the same effective `McpServerConfig` values. ## Scope This PR does not add new MCP capabilities or change user-visible behavior. It does not add executor plugin discovery, thread-scoped registrations, dynamic refresh generations, or new user/managed policy semantics. ## Verification - Added focused catalog coverage for source precedence, complete configuration preservation, disabled vetoes, plugin ownership, contribution-order tie breaking, removal outcomes, and conflict diagnostics. - Extended hosted Apps coverage for ordered extension removal and Apps-disabled hosts with and without the hosted extension installed. - `cargo check -p codex-mcp --tests -p codex-extension-api -p codex-core`
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
Run the following on Mac or Linux to install Codex CLI:
curl -fsSL https://chatgpt.com/codex/install.sh | sh
Run the following on Windows to install Codex CLI:
powershell -ExecutionPolicy ByPass -c "irm https://chatgpt.com/codex/install.ps1 | iex"
Codex CLI can also be installed via the following package managers:
# 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.
