Deed

Overview

Deed is a contract-first language and MCP server designed for capability-aware code and patch review. It enables AI assistants to perform security-focused code analysis by treating capabilities as first-class constructs. Any MCP-compatible AI can call Deed's tools directly, letting the model decide when to apply them during conversations or agent workflows.

Deed runs locally on your machine via the deed-lang package, which communicates over stdio. No authentication is required—it works immediately after installation. The latest release is v0.2.13, distributed under the Apache-2.0 license with source code available at deed-lang/deed on GitHub.

Deed is categorized as a Security tool on mcp.site and integrates with all major MCP clients including Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, and Zed. Install it using npx -y deed-lang. If you maintain Deed, visit mcp.site to claim this listing, verify ownership, and keep information up to date.

Installation

// claude_desktop_config.json
{
  "mcpServers": {
    "deed": {
      "command": "npx",
      "args": [
        "-y",
        "deed-lang"
      ]
    }
  }
}