Anthropic API

The Messages API can call a remote MCP server for you: Claude decides when to call get_toc, search_instructions and get_section, and Anthropic’s servers make those calls with your key.

import anthropic

client = anthropic.Anthropic()
response = client.beta.messages.create(
    model="claude-opus-5-5",
    max_tokens=16000,
    betas=["mcp-client-2025-11-20"],
    mcp_servers=[{
        "type": "url",
        "url": "https://app.jitprompt.com/mcp",
        "name": "jitprompt-support-bot",
        "authorization_token": "imcp_...",
    }],
    tools=[{"type": "mcp_toolset", "mcp_server_name": "jitprompt-support-bot"}],
    system="You are a support agent. Check the instructions before every reply.",
    messages=[{"role": "user", "content": "Can I get a refund on my annual plan?"}],
)

Both halves are required: mcp_servers defines the connection, and the mcp_toolset entry in tools (with the same name) exposes its tools.

Keep the key out of source code — read it from an environment variable or your secret store.