Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden. It does add real behavioral context by enumerating how two captures can be linked (references, shared entities, asserted relations, tag overlap), which is more than the schema conveys. However, it says nothing about read-only nature, cost/latency of a graph search, what happens when no path exists, or path optimality guarantees.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.