Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations only supply idempotentHint, so the description carries the behavioral load and does so: it discloses the login/manageActivities auth requirement, the previewHash gate, the re-confirmation requirement on state change, the revocation meaning of an empty invitedUserIds array, the exclusive-link impact of a closed list, and that notifyInvitees sends App-only notifications with no delivery guarantee.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The content is densely packed but front-loaded: permission tag first, then the preview/execute workflow, then per-parameter edge cases. Every sentence carries operational value, though the run-on punctuation makes it harder to scan than a cleanly structured list.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For an 8-parameter mutation tool with no output schema and only idempotentHint in annotations, the description covers auth, the confirm-then-execute safety flow, the two edge-case parameters, and the side effects on exclusive links and notifications. The remaining gap (enum value meanings) is minor relative to what is provided.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 0% schema description coverage, the description meaningfully compensates for several parameters: preview default true, how previewHash is used, invitedUserIds 'omitted=keep, empty=revoke' semantics, and notifyInvitees default false plus delivery caveat. It does not explain the audience enum values (PUBLIC/MEMBERS/INVITEES) or appActivation required/none, so it stops short of full coverage.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description pairs the permission scope (【登录、manageActivities】) with the concrete operation: adjusting an activity's audience and invite list, with a default preview that returns audience, list, App confirmation requirements and notification impact. The resource and verb are recoverable, but the opening sentence jumps straight into the preview workflow rather than plainly stating 'this changes the audience/invite list', which leaves purpose slightly implicit.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

It gives an explicit two-phase workflow: call with default preview=true to inspect, then repeat with the same parameters plus preview=false and previewHash to execute, and re-confirm if state changed. This is exactly the when/how guidance an agent needs, with no ambiguity about the execution path.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.