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Harness

Harness is an MCP server that adds developer tools to AI assistants such as Claude Desktop, Claude Code and Cursor. Start Claude Code and Codex agents the person can watch, wait for them and read their answers. It has 1,369 GitHub stars, is released under the MIT license and runs locally with npx -y @autonomous-ai/harness-mcp.

github.com/autonomous-ai/openharness (opens in a new tab)

Data as of from the GitHub API and the official MCP registry; description from the project's repository. Report an error

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Install Harness

Generated from the server's MCP registry entry. Replace your-value with your own values.

Claude Desktop

claude_desktop_config.json
{
  "mcpServers": {
    "harness": {
      "command": "npx",
      "args": [
        "-y",
        "@autonomous-ai/harness-mcp"
      ]
    }
  }
}

Settings > Developer > Edit Config. macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\. Restart Claude Desktop afterwards.

Claude Code

claude mcp add --transport stdio harness -- npx -y @autonomous-ai/harness-mcp

Cursor

.cursor/mcp.json
{
  "mcpServers": {
    "harness": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@autonomous-ai/harness-mcp"
      ]
    }
  }
}

Project file; use ~/.cursor/mcp.json to enable it in every project.

VS Code

.vscode/mcp.json
{
  "servers": {
    "harness": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@autonomous-ai/harness-mcp"
      ]
    }
  }
}

Config formats checked against the official docs on Oct 7, 2026: modelcontextprotocol.io (opens in a new tab), code.claude.com (opens in a new tab), cursor.com (opens in a new tab), code.visualstudio.com (opens in a new tab).

About Harness

The ultimate harness for coding agents and beyond. Claude Code at work. Codex at home. Hermes in the cloud. One command center. Start with code. Then follow your curiosity and build across disciplines: CAD, circuits, robots, games and music.

  • ai-agents
  • claude-code
  • codex
  • coding-agents
  • developer-tools
  • opencode
  • terminal
  • tmux
  • agent-harness
  • cad

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FAQ

Harness FAQ

Still curious? Email info@appsgit.com.

How do I install the Harness MCP server?

Add the command npx -y @autonomous-ai/harness-mcp to your MCP client: put it in claude_desktop_config.json for Claude Desktop, run claude mcp add for Claude Code, or add it to .cursor/mcp.json (Cursor) or .vscode/mcp.json (VS Code). The snippets on this page are ready to paste.

Is Harness free?

The server is open source under the MIT license, so running it is free. It does not declare any required API key.

Is Harness actively maintained?

The most recent commit was on Oct 26, 2026. The latest release is v0.4.69_cli, published Oct 26, 2026. appsgit only lists MCP servers with a commit in the last six months.