# Ouroboros (MCP server)

> Ouroboros is an MCP server that adds developer tools to AI assistants such as Claude Desktop, Claude Code and Cursor. Pins an acceptance spec; the verify command and expected output never enter the success contract. It has 6,189 GitHub stars, is released under the MIT license and runs locally with uvx ouroboros-ai.

It gets smarter on its own. We just hold the line. Skip the prompt engineering. The agent runs, fails, and gets smarter every generation. The grading command and expected result never make it into the success contract we hand it.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/Q00/ouroboros |
| GitHub stars | 6,189 |
| License | MIT |
| Language | Python |
| Transport | stdio |
| Packages | pypi: ouroboros-ai |
| Remote URL | none |
| Needs API key | no |
| Official | no |
| Works with | Claude Desktop, Claude Code, Cursor, VS Code |
| Category | Developer tools |
| Latest release | v0.55.6 (Oct 6, 2026) |
| Last commit | Oct 6, 2026 |
| MCP registry name | io.github.Q00/ouroboros |

## Install

### Claude Desktop (claude_desktop_config.json)

```json
{
  "mcpServers": {
    "ouroboros": {
      "command": "uvx",
      "args": [
        "ouroboros-ai"
      ]
    }
  }
}
```

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

### Claude Code

```sh
claude mcp add --transport stdio ouroboros -- uvx ouroboros-ai
```

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

```json
{
  "mcpServers": {
    "ouroboros": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "ouroboros-ai"
      ]
    }
  }
}
```

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

### VS Code (.vscode/mcp.json)

```json
{
  "servers": {
    "ouroboros": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "ouroboros-ai"
      ]
    }
  }
}
```

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

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