Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
The definition covers purpose, how to obtain the memory ID, what the update does to the vector store, and parameter constraints. With an output schema present, return values need no explanation. Minor gaps remain around invalid IDs or empty content, but for a two-parameter update tool the description is largely complete.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.