How to install Harness in Claude Code

To install Harness in Claude Code, run "claude mcp add harness -- npx -y @autonomous-ai/harness-mcp" in your terminal, then check it with "claude mcp list". It takes about a minute.

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1
Run the install command
Open a terminal in your project and run:
```
claude mcp add harness -- npx -y @autonomous-ai/harness-mcp
```
2
Choose where it applies (optional)
Add --scope user to use it in every project, or --scope project to share it with your team through a .mcp.json file.
```
claude mcp add --scope user harness -- npx -y @autonomous-ai/harness-mcp
```
3
Check that it is connected
List your servers, or type /mcp inside a Claude Code session to see its status and tools.
```
claude mcp list
```

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

Install Harness in another app

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Questions

Does Harness work in Claude Code?

Yes. Claude Code supports mcp servers (local and remote), skills and plugins, and Harness installs with the steps above.

Harness does not show up in Claude Code. What now?

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

Is Harness safe?

It scores 95 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.

Run the install command

Choose where it applies (optional)

Check that it is connected

Install Harness in another app

Questions