Heddle

Overview

Heddle is a Model Context Protocol server that manages content-addressed contracts and a verification cache, reducing agent context windows by eliminating redundant verification of proven code. It exposes these capabilities as tools that AI assistants can invoke directly during reasoning and code generation tasks.

The server runs locally on your machine via the Python package heddle-mcp, installed through uvx. It communicates over stdio and requires no authentication or external credentials to operate. The latest release is v0.3.3 under the Apache-2.0 license, with source code available at davet47/heddle on GitHub.

Heddle is categorized as an AI & Agents tool on mcp.site and integrates with Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, Zed, and other MCP clients. If you maintain Heddle, you can claim this listing to verify ownership and keep the information accurate.

Installation

// claude_desktop_config.json
{
  "mcpServers": {
    "heddle": {
      "command": "uvx",
      "args": [
        "heddle-mcp"
      ]
    }
  }
}