updated mcp spec tut
An MCP server that demonstrates modern MCP spec features including elicitation (interactive confirm dialogs), signed request state, and cache hints, with a deploy tool requiring confirmation. It runs as both a Node server and a Cloudflare Worker, supporting stateless per-request handling.
README
updated mcp spec tut
Small MCP server that plays with the newer bits of the spec: elicitation
(interactive confirm dialogs), signed request state, and cache hints on
tools/list. Ships as a plain Node server and as a Cloudflare Worker, same
handler underneath.
What it does
The deploy tool needs confirmation before it does anything. If the
connecting client supports elicitation, the server pops a real confirm
dialog and mints a signed, short lived state token to track that flow. If
the client doesn't support elicitation, it falls back to a
confirm: true argument instead. legacy-client-test.ts exercises that
fallback path directly.
Every request builds a fresh McpServer instance, so server_stats
shows you the process is stateless per request while list_deployments
proves you can still keep real state around (in memory here, for the demo).
Run it
npm install
npm run server # starts on http://127.0.0.1:3000/mcp
npm run client # connects, deploys, reads it back
Cloudflare Worker
Same MCP handler, just wired through worker.ts and wrangler.jsonc.
npx wrangler dev
npx wrangler deploy
Set STATE_KEY in production so every instance verifies request state
with the same secret.
Files
bot.ts: the actual MCP server and toolsserver.ts: Node entrypoint (Hono +@hono/node-server)worker.ts: Cloudflare Worker entrypointclient.ts: demo client with elicitation supportlegacy-client-test.ts: demo client without it, uses the fallback
enjoy!! :)
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