# TinyFn > 500+ deterministic utility tools for AI agents via Model Context Protocol (MCP) and REST API. TinyFn provides accurate, hallucination-free results for math, string operations, validation, encoding, hashing, date/time, conversions, and more. Every tool returns deterministic output — no LLM involved in computation. ## Quick Start MCP Config (add to claude_desktop_config.json or similar): "mcpServers": { "tinyfn": { "url": "https://tinyfn.io/mcp/all" } } REST API: GET https://tinyfn.io/v1/math/add?a=2&b=3 GET https://tinyfn.io/v1/validate/email?email=test@example.com GET https://tinyfn.io/v1/generate/uuid ## Documentation - Full API Docs (llms-full.txt): https://docs.tinyfn.io/llms.txt - API Reference: https://docs.tinyfn.io - MCP Setup: https://tinyfn.io/mcp - Tools Directory: https://tinyfn.io/tools - Blog: https://tinyfn.io/blog ## Categories Math, String, Validation, Generator, Conversion, DateTime, Encoding, Hash, Crypto, Color, Network, Geo, Array, Stats, Finance, Health, JSON, Text, Regex, Password, Slug, Case, Format, Fun, Misc, Lorem, IP, Number, Time, Random ## Pricing - Free: 100 requests/month - Starter ($5/mo): 10,000 requests/month - Pro ($15/mo): 100,000 requests/month ## Contact Website: https://tinyfn.io