modelcontextprotocol/typescript-sdk
Watch
1
0
Fork
You've already forked typescript-sdk
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions 1

Implement MCP 2026-07-28 (#2286)

Browse source 
Co-authored-by: Matt <77928207+mattzcarey@users.noreply.github.com>
Co-authored-by: Konstantin Konstantinov <KKonstantinov@users.noreply.github.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
This commit is contained in:
Felix Weinberger 2026-06-26 14:01:10 +01:00 • committed by GitHub
commit 1823aae891
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
1 changed files with 69131 additions and 9001 deletions
Download patch file Download diff file Expand all files Collapse all files

10
.changeset/create-mcp-handler.md Normal file
View file

@ -0,0 +1,10 @@
---
'@modelcontextprotocol/server': minor
---
Add `createMcpHandler(factory, { legacy?, onerror?, responseMode? })`, an HTTP entry point that serves the 2026-07-28 draft revision per request: each envelope-carrying request is classified once, served on a fresh instance from the factory bound to the claimed revision,
and answered with a JSON body or a lazily-upgraded SSE stream. 2025-era serving is selected with the `legacy` option (`'stateless'` — the default — for per-request stateless serving via the existing streamable HTTP transport, `'reject'` for a modern-only strict endpoint
that answers 2025-era requests with the unsupported-protocol-version error naming its supported revisions). The handler is a web-standard `{ fetch, close, notify, bus }` object: `fetch(request, { authInfo?, parsedBody? })` is the only request face (Node frameworks wrap it with
`toNodeHandler(handler)` from `@modelcontextprotocol/node`), and `close()` tears down in-flight modern exchanges. Also exported: `legacyStatelessFallback` (the same stateless legacy serving as a standalone fetch-shaped handler), the `PerRequestHTTPServerTransport` single-exchange transport and the
`classifyInboundRequest` classifier for hand-wired compositions, and the supporting types. `responseMode: 'json'` never streams and drops mid-call notifications (progress, logging and other related messages emitted before the result); listen-class subscription streams are
always served over SSE. The entry performs no Origin/Host validation (use the middleware packages) and no token verification — `authInfo` is pass-through and never derived from request headers.