lynq

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lynq

Session-aware MCP servers. Declare visibility rules as middleware.

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Why lynq
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Session-Scoped Visibility

Tools appear after login, hide on logout. authorize() notifies the client automatically — no manual sendToolListChanged.

Hono-Style Middleware

Global via server.use(), per-tool inline. Three hooks — onRegister, onCall, onResult. Pure objects, no classes.

Built-in Middleware

guard() · bearer() · jwt() · github() · google() · rateLimit() · logger() · truncate() · credentials() — compose freely.

Framework Agnostic

server.http() returns a standard (Request) => Response handler. Mount in Hono, Express, Deno, Cloudflare Workers.

Test Helpers

createTestClient() for in-memory testing. No transport setup. Assert visibility, call tools, inspect results.

Tiny Core

One dependency. ESM only. No config files, no directory scanning, no magic.

Quick Look ​

ts
server.tool("login", config, handler);            // always visible
server.tool("weather", guard(), config, handler);  // hidden until authorized
// Client gets notified automatically. No manual wiring.