## Why **In short:** this PR discovers MCP registrations by reading a selected plugin's `.mcp.json` on its executor. #27884 then resolves those registrations in the shared catalog. `thread/start.selectedCapabilityRoots` can select a plugin root owned by an executor, and Codex can resolve that package through the executor filesystem. MCP declarations inside the selected plugin are still ignored. This PR adds the source-specific discovery layer on top of the selected-plugin catalog boundary in #27884: ```text selected capability root | v resolve the plugin through its executor filesystem | v read and normalize its MCP config through the same filesystem | v contribute stdio registrations bound to that environment ID ``` The existing MCP launcher and connection manager remain unchanged. MCP config parsing is shared with local plugins through #27863. ## What changed - Added an executor plugin MCP provider in the MCP extension. - Retained only the exact filesystem capability used for package resolution and reused it for the selected plugin's MCP config, with no host-filesystem fallback or unrelated process/HTTP authority. - Read either the manifest-declared MCP config or the default `.mcp.json`; a missing default file means the plugin has no MCP servers. - Accepted stdio servers only for this first vertical. Executor-owned HTTP declarations are skipped with a warning until their placement semantics are defined. - Normalized stdio registrations with the owning environment's stable logical ID and plugin-root working directory. - Resolved environment-variable names on the owning executor and rejected explicit local forwarding for non-local plugins. - Froze discovered declarations once per active thread runtime, then applied current managed plugin and MCP requirements when contributing them. - Carried the selected root ID, display name, and selection order into the catalog contribution defined by #27884. ## Behavior and scope There is intentionally no production behavior change yet. This PR provides the executor provider and contribution boundary, but app-server does not install it in this change. Existing local plugin MCP loading is unchanged, and no MCP process is launched by this PR alone. ## Assumptions - The selected root ID is the plugin policy identity; the manifest display name is presentation metadata. - An environment ID is a stable logical authority. Reconnection or replacement under the same ID does not change ownership. - Selected plugin packages and their manifests are trusted inputs. - The selected package and MCP discovery snapshot remain frozen for the active thread runtime. ## Follow-up The next PR installs this contributor in app-server and adds an end-to-end test proving that a selected plugin MCP tool launches on its owning executor, can be called by the model, survives an explicit MCP refresh, and is invisible when its root was not selected. Resume, fork, environment removal or ID changes, dynamic catalog reload, and executor-owned HTTP MCP placement remain separate lifecycle decisions. ## Verification Focused tests cover executor-only filesystem reads, missing and malformed config, stdio filtering and normalization, managed requirements, package attribution, and selection order. CI owns execution of the test suite.
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.
