# Harness (MCP server)

> 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.

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.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/autonomous-ai/openharness |
| GitHub stars | 1,369 |
| License | MIT |
| Language | TypeScript |
| Transport | stdio |
| Packages | npm: @autonomous-ai/harness-mcp |
| Remote URL | none |
| Needs API key | no |
| Official | yes |
| Works with | Claude Desktop, Claude Code, Cursor, VS Code |
| Category | Developer tools |
| Latest release | v0.4.69_cli (Oct 26, 2026) |
| Last commit | Oct 26, 2026 |
| MCP registry name | ai.autonomous.harness/harness |

## Install

### Claude Desktop (claude_desktop_config.json)

```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

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

### Cursor (.cursor/mcp.json)

```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)

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

Config formats checked against the official docs on 2026-10-07.

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