Calc Mcp

Gives Claude 21 local tools for operations where LLMs reliably fail: arbitrary precision math evaluation, cryptographically secure random generation (UUID v4/v7, ULID, passwords), timezone-aware date arithmetic, and hash computation (SHA-256, HMAC, etc.). Also handles base64/URL/HTML encoding, regex operations with ReDoS protection, semantic versioning comparisons, JWT decoding, cron parsing, Luhn validation, and IP range analysis. Everything runs sandboxed on your machine via stdio transport. Reach for this when you need deterministic calculations, true randomness, or format operations that can't hallucinate. Works with Claude Desktop, VS Code Copilot, Cursor, and Windsurf out of the box.