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

Beyond the annotations (idempotent, non-destructive, closed-world), the description discloses that the call performs a draft write, that unpublished visitors see only a neutral prompt, and that publishing still requires a preview confirmation. That is meaningful side-effect and downstream-state context the annotations alone do not convey. It stops short of saying what the response contains or how the link behaves after publication changes.

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?

One dense sentence, front-loaded with the login requirement and the core action, followed by the exclusions and visitor-facing caveat. Every clause carries information, though the semicolon-chained phrasing is denser than necessary and could be split for faster scanning.

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 one-parameter, idempotent draft write with no output schema, the definition covers prerequisites, side effects, and non-effects well enough to invoke it correctly. The only real gap is that the return value (presumably the link and QR payload) is implied by the name and title rather than stated.

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 coverage is 0% for the single composeId parameter, so the description must carry the meaning — and it does, specifying that it must be the caller's own existing draft id, not an arbitrary activity id. It adds no format or length guidance, but the essential semantic constraint is supplied.

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 names a specific verb and resource — idempotently reserving a stable registration link/QR code for a draft identified by composeId — and explicitly bounds it against adjacent operations ('不会创建已发布活动、开放报名、邀请或发送消息'). An agent can distinguish this from siblings such as publish_activity_draft, create_guest_invite_link, or derive_activity_registration_poster without opening the 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 states the precondition clearly ('为本人已有草稿composeId', '登录'), which tells the agent this only applies to a draft the caller already owns, and the negative list rules out publish/invite/message flows. It does not name a specific alternative tool to use instead when the activity is already published, so routing guidance is implied rather than explicit.

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