Is your MCP server ready for the 2026-07-28 spec?

The release candidate is the largest version bump since MCP launched: the initialize handshake is removed, Mcp-Session-Id is eliminated, and new routing headers become mandatory. Most remote servers built on earlier specs will need changes. Paste your endpoint (or GitHub repo) and we'll test it live — read-only, no credentials, results in seconds.

What this checks

Session dependence (SEP-2567) — the RC removes Mcp-Session-Id; servers that require it break behind stateless clients.
Handshake dependence (SEP-2575) — the RC removes initialize; clients will call server/discover instead.
Protocol version — what your server negotiates today.
Deprecated capabilities — logging (also roots and sampling client-side) enter a 12-month removal window.
OAuth discovery — protected-resource metadata for auth-gated servers.
SDK version bounds (repo mode) — unbounded mcp dependencies resolve to the breaking major the day it ships.

Checks are read-only: one handshake, one tools/list, one server/discover call, and public metadata fetches. We never invoke tools or send credentials. Details in the methodology.