Harness MCP Server: Install & Setup

Install Harness in Claude Code

npm

Claude Code

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

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

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

MCP Bundle (.mcpb)

Claude Code

curl -LO https://github.com/autonomous-ai/openharness/releases/download/v0.4.20_cli/harness-mcp.mcpb

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

Download harness-mcp.mcpb and double-click it to install in Claude Desktop.

MCP Bundles install in one click in Claude Desktop. Download the file, then open it.

Frequently asked questions

What does the Harness MCP server do?

Start Claude Code and Codex agents the person can watch, wait for them and read their answers.

Is the Harness MCP server free?

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Does Harness run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add Harness to Claude Code?

Run: claude mcp add autonomous-ai-harness -- npx -y @autonomous-ai/harness-mcp

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