Semantic API

An MCP (Model Context Protocol) server that lets Claude, ChatGPT, and other LLM agents search and discover APIs using natural language via Semantic API. Ask for any API capability in plain English and get back endpoint details, parameters, auth info, and code snippets.

Install

pip install semanticapi-mcp

Or run directly with uvx:

uvx semanticapi-mcp

Configuration

Get an API Key

Sign up at semanticapi.dev to get your API key.

Environment Variables

Variable	Required	Default	Description
SEMANTIC_API_KEY	Yes	—	Your Semantic API key
SEMANTIC_API_URL	No	https://semanticapi.dev	API base URL override

Claude Desktop

Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json):

{
  "mcpServers": {
    "semanticapi": {
      "command": "uvx",
      "args": ["semanticapi-mcp"],
      "env": {
        "SEMANTIC_API_KEY": "your-api-key-here"
      }
    }
  }
}

Or if installed with pip:

{
  "mcpServers": {
    "semanticapi": {
      "command": "semanticapi-mcp",
      "env": {
        "SEMANTIC_API_KEY": "your-api-key-here"
      }
    }
  }
}

Tools

semantic_query

Search for an API capability using natural language.

Inputs:

• query (string, required) — What you want to do, e.g. "send an email with Gmail"
• auto_discover (boolean, optional, default: true) — Auto-discover new APIs if needed

Example: "Find me an API to convert currencies in real-time"

semantic_discover

Deep discovery of a specific provider/API by name and intent.

Inputs:

• provider_name (string, required) — API provider name, e.g. "stripe", "twilio"
• user_intent (string, optional) — What you want to do with this API

Example: Discover Stripe's capabilities for "process a refund"

semantic_discover_url

Analyze any API from its documentation URL.

Inputs:

• url (string, required) — URL of the API documentation
• user_intent (string, optional) — What you want to do with this API

Example: Analyze https://docs.example.com/api to generate a provider config

Related

• Semantic API — The hosted API service
• semanticapi-engine — Open source engine (AGPL-3.0)
• semantic-api-skill — Agent framework skill package
• CLI Tool — Command-line interface (pip install semanticapi-cli)

License

MIT