Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Even without an output schema, the description enumerates what is returned (goal details, permissions, collaborators, tasks), covers auth and permission checks, explains edge-case behavior (truncation, closed tasks, backfill), and points to sibling tools for related mutations. This is sufficiently complete for an agent to invoke it correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.