Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden and largely succeeds: it discloses the deliberate lazy-loading of the vector store, the 30s timeout rationale, the warning behavior for a server-owned root, and that only memory headings are read. It does not say whether setting project_path persists state across calls, which is the main missing side-effect disclosure.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.