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How to install Devtools MCP in Codex
To install Devtools MCP in Codex, run "codex mcp add devtools-mcp -- npx -y @gjsify/devtools-mcp" in your terminal, then type /mcp in Codex to check it.
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Run the install command
In a terminal, run:
codex mcp add devtools-mcp -- npx -y @gjsify/devtools-mcp - 2
Check it
Inside Codex, type /mcp to see the server and its tools.
MCP servers run with your permissions. If Devtools MCP needs an API key, add it under env in the config. Check its README.
Install Devtools MCP in another app
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Questions
Does Devtools MCP work in Codex?
Yes. Codex supports mcp servers in the codex cli and ide extension, and Devtools MCP installs with the steps above.
Devtools MCP 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 Devtools MCP safe?
It scores 82 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.