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

Annotations supply only readOnlyHint, so the description carries most of the behavioral load and does add real value: it discloses that only status and desensitized remarks are returned and that contact details are deliberately excluded, and it warns that approval does not equal an invitation. That is meaningful disclosure beyond the annotation. It does not mention pagination, ordering, or whether pending/approved are mixed in one list.

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?

Very compact — each semicolon-separated clause carries distinct information (login, scope, permission flag, output restriction, follow-up tool, state caveat) with no filler. The telegraphic delivery and mixing of Chinese terms with English tool/flag names makes it denser to parse than necessary, but nothing is redundant.

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 a read-only single-parameter list tool with no output schema, the description covers the essentials: access conditions, what fields come back and what is intentionally withheld, and what the approval state does not imply. Missing are any note on result volume/paging and on how the returned status values should be interpreted.

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?

Schema description coverage is 0% for the single required activityRef, so the description must compensate. It implies the parameter scopes results to '本场' (this activity) and that non-managers see only their own requests within it, which is some added meaning, but it never clarifies the reference format (ID vs. slug) or any constraints such as the 100-character maximum.

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 conveys a scoped listing of contact-authorization requests ('联系管理者看本场，其余仅本人申请'), making clear that visibility depends on role, and it names the canReview permission flag. It never restates the verb+resource plainly (the name/title carry that), and it does not distinguish itself from adjacent tools like review_activity_cloud_contacts or request_activity_cloud_contacts, so it stops short of a 5.

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 a prerequisite ('登录') and implies the caller must be an organizer/manager to see the whole activity, otherwise only their own requests — useful context for when this tool yields meaningful data. It does not say when to use this instead of review_activity_cloud_contacts or request_activity_cloud_contacts; invite_activity_cloud_member_manually is named only as a downstream step, not as an alternative.

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