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MCP Stateless Check

MCP010 — The removed HTTP GET stream endpoint is still served
Severity error
Fixed by Upgrading your MCP SDK to a release targeting 2026-07-28
Transports http
Specification 2026-07-28
Changelog entry Major change 4 (SEP-2575)

Why this changed

The GET half of Streamable HTTP — the always-open server-to-client stream — was replaced by subscriptions/listen. A GET endpoint still answering with an event stream means the old notification path is live, and clients that no longer open it will silently miss everything sent down it.

Running just this check

Terminal window
npx mcp-stateless --http https://mcp.example.com/mcp --only MCP010

Suppressing it

If this check does not apply to your server, skip it:

Terminal window
npx mcp-stateless --http https://mcp.example.com/mcp --skip MCP010

Rule ids are permanent and are never reissued, so a suppression cannot start silently matching a different check later.

Generated from src/rules/MCP010.ts by scripts/gen-rule-docs.mjs. Edit the rule source, not this page.