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MCP Stateless Check

MCP011 — Resource-not-found still returns the old -32002 error code
Severity error
Fixed by Upgrading your MCP SDK to a release targeting 2026-07-28
Transports stdio, http
Specification 2026-07-28
Changelog entry Minor change 6

Why this changed

Resource-not-found moved from the ad-hoc -32002 to JSON-RPC’s standard -32602 (Invalid Params). -32002 now sits in the implementation-defined block, so a client cannot tell a stale not-found from a vendor-specific error.

Running just this check

Terminal window
npx mcp-stateless --stdio "node dist/server.js" --only MCP011

Suppressing it

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

Terminal window
npx mcp-stateless --stdio "node dist/server.js" --skip MCP011

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

Generated from src/rules/MCP011.ts by scripts/gen-rule-docs.mjs. Edit the rule source, not this page.