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docs: serve the TypeScript quickstart server with serveStdio - #3427
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The 2026-07-28 "Build an MCP server" quickstart wired its TypeScript server with `server.connect(new StdioServerTransport())`, which only serves clients that open with the 2025-era `initialize` handshake. A server built from the page failed version negotiation against 2026-07-28 clients, while the Inspector's default `legacy` era hid the failure. Build the server in a `createServer()` factory and serve it with `serveStdio(createServer)` from `@modelcontextprotocol/server/stdio`, which negotiates the era per connection and keeps 2025-era clients working. Explain why the factory returns a fresh instance, note that the hand-wired form only serves 2025-era clients, and add an Inspector CLI step that lists the tools in the `modern` era. The draft copy of the page receives the same change. Fixes #3422 Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01XFU2zyusVTttWcakgCjXjR
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The comment above createServer said serveStdio calls it once per connection. The SDK calls the factory for every instance it needs, which is twice when a server/discover probe is followed by an initialize fallback, as the paragraph under "Running the server" already says. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01XFU2zyusVTttWcakgCjXjR
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Requested by Den Delimarsky · Slack thread
Before: The TypeScript tab of the 2026-07-28 "Build an MCP server" quickstart wires the server with
server.connect(new StdioServerTransport()). That entry point only serves clients that open with the 2025-erainitializehandshake, so a server built from the page fails against a 2026-07-28 client withVersion negotiation failed: the server did not offer pinned protocol version 2026-07-28 via server/discover. The Inspector defaults to thelegacyera, so the page's own test step looks fine.After: The tutorial builds the server in a
createServer()factory and serves it withserveStdio(createServer)from@modelcontextprotocol/server/stdio, which negotiates the era per connection and keeps 2025-era clients working. A short paragraph explains why the factory returns a fresh instance on every call and notes that the hand-wired form only serves 2025-era clients. A new Inspector CLI step lists the tools with--protocol-era modern. The draft copy of the page receives the same change.How: Only the TypeScript tab of
docs/docs/2026-07-28/develop/build-server.mdxanddocs/docs/draft/develop/build-server.mdxchanges. The tutorial code was extracted from the page as written, built with@modelcontextprotocol/server2.3.1, and checked with the Inspector CLI 2.9.0: before the changetools/listsucceeded only in thelegacyandautoeras, after itlegacy,autoandmodernall listget_alertsandget_forecast.check:docs:format(on the changed files),check:docs:js-commentsandcheck:docs:linkspass.Fixes #3422
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https://claude.ai/code/session_01XFU2zyusVTttWcakgCjXjR
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