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## Summary Remote stdio MCP servers send tool calls by writing JSON-RPC bytes through `process/write`. When the exec-server websocket drops at the wrong time, the remote process can survive session recovery, but the stdin write can still fail back to RMCP as a transport send error. RMCP then closes the stdio MCP transport, so tools like `node_repl` are lost even though the process/session recovery path is working. This changes `process/write` to be safe to retry across exec-server recovery: - adds a required `writeId` to `process/write` - retries remote `Session::write` with the same `writeId` after reconnect - remembers accepted write ids per process so duplicate retries return `Accepted` without writing the same bytes to child stdin again - covers both the client retry path and server-side write id dedupe with tests In simple terms: ```text before: write to MCP stdin -> websocket closes -> write errors -> RMCP closes node_repl after: write to MCP stdin -> websocket closes -> reconnect -> retry same writeId server either writes once or recognizes it already did ```
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:
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- 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.
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You can also use Codex with an API key, but this requires additional setup.
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This repository is licensed under the Apache-2.0 License.