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HAL

DeanWard/HAL

HAL is a Model Context Protocol (MCP) server that provides HTTP API capabilities to Large Language Models. It allows LLMs to make HTTP requests and interact with web APIs through a secure, controlled interface. HAL can also automatically generate tools from OpenAPI/Swagger specifications for seamless API integration.

View on GitHub

Install

npx hal-mcp

Client configuration

{
  "mcpServers": {
    "hal": {
      "command": "npx",
      "args": [
        "hal-mcp"
      ]
    }
  }
}

Environment variables

HAL_SWAGGER_FILEHAL_API_BASE_URLHAL_SECRET_API_KEYHAL_SECRET_USERNAMEHAL_SECRET_PASSWORDHAL_SECRET_TOKENHAL_SECRET_MICROSOFT_API_KEYHAL_SECRET_GITHUB_TOKENHAL_WHITELIST_URLSHAL_BLACKLIST_URLS
Author
@DeanWard
Category
Developer Tools, AI Chatbot
License
MIT
Updated
Oct 6, 2026

Features

  • HTTP GET/POST/PUT/PATCH/DELETE/OPTIONS/HEAD Requests: Fetch and send data to any HTTP endpoint

  • Secure Secret Management: Environment-based secrets with {secrets.key} substitution and automatic redaction

  • Swagger/OpenAPI Integration: Automatically generate tools from API specifications

  • Built-in Documentation: Self-documenting API reference

  • Secure: Runs in isolated environment with controlled access

  • Fast: Built with TypeScript and optimized for performance

Tools (3)

  • list-secrets

    Get a list of available secret keys that can be used with {secrets.key} syntax.

  • http-get

    Make HTTP GET requests to any URL.

  • http-post

    Make HTTP POST requests with optional body and headers.

Details on this page are taken from the project's README. Open README

Supported clients

Clients mentioned in this server's README:

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