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MCP Stateless Check

MCP015 — Server declares deprecated Roots, Sampling or Logging capabilities
Severity warning
Fixed by A change in your own server code
Transports stdio, http
Specification 2026-07-28
Changelog entry Deprecated 1 (SEP-2577)

Why this changed

SEP-2577 deprecated Roots, Sampling and Logging. They still work — the deprecation window is at least twelve months — but they are scheduled for removal, so anything new should not adopt them, and anything existing should plan a migration while the window is open.

Running just this check

Terminal window
npx mcp-stateless --stdio "node dist/server.js" --only MCP015

Suppressing it

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

Terminal window
npx mcp-stateless --stdio "node dist/server.js" --skip MCP015

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

Generated from src/rules/MCP015.ts by scripts/gen-rule-docs.mjs. Edit the rule source, not this page.