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

Annotations only declare readOnlyHint=true, and the description correctly stays consistent with a read-only view. Beyond that it discloses that participation is an array whose values can coexist (CHECKED_IN and GUEST for the same event) and that nextCursor=null is the terminal pagination signal, both of which are non-obvious runtime behaviors. It does not describe record shape or ordering, so it stops short of full disclosure.

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 text is dense and front-loaded, with each clause carrying a distinct rule (categorization, window semantics, pagination, sibling routing, array caveat). It is slightly telegraphic, with shorthand like '登录;' and '四类参与事实', 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?

With no output schema, the description carries the burden of explaining return values, and it does so for the key fields (participation array with multiple values, nextCursor termination). For a read-only four-parameter listing tool this is close to complete; only record-level field detail is left to get_signup_activity.

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 100%, so the baseline is 3. The description still adds meaning beyond the schema by explaining that window=all is the default, that limit is capped at 50, and by supplying the terminating condition for cursor (nextCursor=null), which the schema does not state.

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 opening states a specific verb and resource: it returns the caller's own participation facts across four categories (signup, check-in, online attendance, guest). It explicitly separates this from list_my_signups admission results, so an agent can tell the two apart without opening either schema.

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 explicit routing rules: use get_signup_activity for concrete time, location and arrival guidance on upcoming events, use window=past for paged retrospective review and export by participation category. It also names the alternative for organizer admission status (list_my_signups.reviewStatus) and states the boundary, which is exactly the when/when-not guidance expected.

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