Codebook Mcp

io.github.nexus-api-lab/codebook-mcp

A stateless reference lookup for standard codes you need to get exactly right. Exposes four tools: country_info, currency_info (with minor units for precise decimal handling), http_status, and mime_type. Reach for this when you're building APIs, validating user input, or need an AI agent to return proper ISO codes instead of hallucinating them. Free tier gives you 500 tool calls per IP per day, and they don't log your queries. It's the kind of thing you don't need until you're debugging why your payment processing is off by two decimal places because someone hardcoded currency assumptions.

last updated

Jun 10, 2026

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