How to install Ext Apps in Codex

To install Ext Apps in Codex, run "codex mcp add ext-apps -- npx -y @modelcontextprotocol/ext-apps" in your terminal, then type /mcp in Codex to check it.

Built from the published package · server updated 25 days ago

Run the install command

In a terminal, run:

codex mcp add ext-apps -- npx -y @modelcontextprotocol/ext-apps

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Check it
Inside Codex, type /mcp to see the server and its tools.

MCP servers run with your permissions. If Ext Apps needs an API key, add it under env in the config. Check its README.

Install Ext Apps in another app

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Questions

Does Ext Apps work in Codex?

Yes. Codex supports mcp servers in the codex cli and ide extension, and Ext Apps installs with the steps above.

Ext Apps does not show up in Codex. What now?

Restart Codex fully, check the JSON is valid, and make sure Node.js (for npx) is installed. See common MCP errors and fixes.

Is Ext Apps safe?

It scores 88 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.