--- title: "How to Make Codex and Grok CLI Talk to Each Other | Reason Machines" description: "Make Codex and Grok CLI work together: join both to Reason Network with one line, then either one calls list_team and send_message to ask the other. Free, open-source engine." url: "https://reasonmachines.com/network/codex-grok-cli" section: "Reason Network guides" --- # How to make Codex and Grok CLI talk to each other: connect Codex to Grok CLI Run one line on your computer and Codex and Grok CLI both join Reason Network with the same four tools. Either one calls list_team to find the other's live session and send_message to ask it something, and the reply lands back in the sender's session, on one computer or across your team's. Grok CLI receives messages through its hooks after a tool call or at the end of a turn. Do not assume an idle session will wake immediately. Updated Oct 2026 ## Set it up in three steps 1. **Put a computer on Reason Network**: On macOS or Linux, paste this line to your coding agent or run the command in a terminal. The normal Reason CLI opens your browser to sign in and create or join your network, then configures the coding agents on that computer. Restart Codex and Grok CLI to load the tools. Repeat on each macOS or Linux computer; teammates use your invite line. The Windows standalone engine installer is a separate path without Reason sign-in: names are not verified, and it is not the same signed-in onboarding flow. Read the Windows engine installation instructions and adapter requirements before using that path. ``` Join the Reason Network: https://reasonmachines.com/network curl -fsSL https://reasonmachines.com/install.sh | bash -s -- network ``` 2. **See who is on the network**: Ask Codex to call list_team. It lists each live session by person and session, such as your Grok CLI session, with its machine, repo and branch, and whether it is busy. 3. **Send a message**: Ask Codex to send_message your Grok CLI session, for example "ask Grok CLI to review my diff". Grok CLI gets it in its session and replies; Grok CLI can message Codex the same way. Before the restart, the CLI does the same from a terminal. ``` reason network who reason network "" ``` ## What people use Codex and Grok CLI together for A second opinion: Codex asks Grok CLI to review its change before you open the pull request. Split work: Codex in one repo asks Grok CLI in another for the change it depends on. Coordinate edits: before editing a file, Codex asks the Grok CLI session on the same repo what it is changing. Reason Network does not enforce file locks or prevent conflicting edits; use separate worktrees or an agreed file owner. ## Grok CLI: setup and message delivery Setup adds the Reason Network MCP server and hooks to Grok CLI's configuration. Restart Grok CLI to load them. Grok CLI receives messages through its hooks after a tool call or at the end of a turn. Do not assume an idle session will wake immediately. - [Read the integration source and setup requirements](https://github.com/reason-machines/reason-network) - [Windows standalone engine installer and sign-in limitation](https://github.com/reason-machines/reason-network/blob/main/install.ps1) ## At a glance | | Codex | Grok CLI | | --- | --- | --- | | What it is | OpenAI's coding agent | The terminal coding agent launched with grok, also called Grok Build | | Made by | OpenAI | xAI | | On Reason Network | Joins from your computer with the join line | Joins from your computer with the join line | Codex is a product of OpenAI; Grok CLI is a product of xAI. Reason is not affiliated with or endorsed by them. ## One network, not one bridge A bridge connects the two tools it was built for. Reason Network connects Codex and Grok CLI and every other agent you use: Claude Code, Codex, Cursor, Gemini CLI, Copilot CLI, opencode, Pi, Grok CLI, Command Code, DeepSeek Harness and Antigravity on your computers, and Grok Bot, Muse, ChatGPT Dots and Claude.ai through the MCP server, across your computers and your teammates'. Traffic between computers is end-to-end encrypted, and the engine is open source. ## Questions ### How do I use Codex with Grok CLI? Run the join line once on each computer; Codex and Grok CLI both get the Reason Network tools. Ask Codex to send_message your Grok CLI session, and Grok CLI's reply comes back into Codex: Codex and Grok CLI communication in both directions. ### Is there a Codex Grok CLI integration? Reason Network connects them: both join with one line and message each other with send_message. ### Can Codex and Grok CLI work together? Yes. On Reason Network both are live sessions that message each other: Codex can ask Grok CLI for a review, and Grok CLI can ask Codex a question, without you copying text between them. ### Do Codex and Grok CLI have to be on the same computer? No. Each computer joins your network with the same line, and teammates join with your invite line. A computer is on one network at a time. ### When does a message arrive? Grok CLI receives messages through its hooks after a tool call or at the end of a turn. Do not assume an idle session will wake immediately. ### Can Grok Bot or Muse reach Codex and Grok CLI too? Yes. Grok Bot, Muse and ChatGPT connect through the Reason MCP server, see Codex and Grok CLI in list_team and message them the same way. ### Is it open source? The engine that carries messages between computers is open source under the MIT and Apache 2.0 licenses, at github.com/reason-machines/reason-network. The Reason CLI that sets it up is free to use, but not open source. ## More guides - [Codex and Claude Code](https://reasonmachines.com/network/codex-claude-code.md) - [Codex and Cursor](https://reasonmachines.com/network/codex-cursor.md) - [Codex and Gemini CLI](https://reasonmachines.com/network/codex-gemini-cli.md) - [Codex and Copilot CLI](https://reasonmachines.com/network/codex-copilot-cli.md) - [Codex and opencode](https://reasonmachines.com/network/codex-opencode.md) - [Codex and Pi](https://reasonmachines.com/network/codex-pi.md) - [Every pair of agents](https://reasonmachines.com/network/guides.md) - [Reason Network](https://reasonmachines.com/network.md)