AdYour product here, seen by people installing AI tools every day
AI Plugin Index
Sponsor slots open: 12 of 12, from $249 a month

How to install Devharness in Codex

To install Devharness in Codex, run "codex mcp add devharness -- npx -y devharness" in your terminal, then type /mcp in Codex to check it.

Built from the published package · server updated 12 days ago

  1. 1

    Run the install command

    In a terminal, run:

    codex mcp add devharness -- npx -y devharness
  2. 2

    Check it

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

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

Install Devharness in another app

Claude CodeClaude DesktopCursor VS CodeWindsurfGemini CLI Antigravity CLI ChatGPT

Similar servers

browser-use browser-use
100

Control a real Chrome browser to complete any task: fill forms, extract data, book flights.

AAA Local 119k
Actionbook actionbook
95

Let your AI agent operate any website through a real, logged-in browser session.

AAA Remote 1.6k
Robin: AI-Powered Dark Web OSINTapurvsinghgautam
94

Dark web OSINT over Tor: search onion engines, scrape pages, report with your own model.

AAA Local 7.6k

Questions

Does Devharness work in Codex?

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

Devharness 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 Devharness safe?

It scores 80 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.