mcp-lite

A lightweight, fetch-first implementation of the Model Context Protocol (MCP) server APIs. v0.10.0, actively developed. Rewrites the TypeScript MCP SDK from scratch, keeping only server essentials: JSON-RPC handling, typed tool definitions, and HTTP+SSE transport using the Fetch API (works on Node, Bun, Cloudflare Workers, Deno, Supabase Edge Functions, browsers with Service Workers). Zero runtime dependencies in core, opt-in adapters for sessions and client calls. Differentiator: minimal footprint, no heavy SDK baggage, Standard Schema support (Zod, Valibot, Effect, ArkType).