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

With only destructiveHint: false as an annotation, the description carries the behavioral burden and does so thoroughly: it discloses permission requirements, that it does not send or represent acceptance, that the note is not delivered, that the page verifies phone numbers, and the full preview/confirm workflow with previewHash and re-confirmation on 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?

The content is dense but front-loaded with the permission requirement and the core action. Every sentence carries operational meaning, though the single-block presentation could be more scannable.

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 5-parameter tool with no output schema, the description covers permissions, side effects, and the preview flow. However, it does not explain what the tool returns (e.g., the link) or how the agent retrieves it, and it leaves the two required parameters largely undescribed.

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%, so the description must compensate. It explains the note field ('note仅操作说明，不发送') and the preview/previewHash confirmation pattern well, but the two required parameters activityRef and userId receive only indirect mentions ('指定云成员', implicit event context) without format or identification guidance.

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 states a specific action: granting a designated cloud member a named audience and preparing a self-fill link. It distinguishes itself from sending tools with '不代发' (does not send on their behalf). It is clear but does not explicitly name the sibling it contrasts with.

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 a permission prerequisite ('需当前联系管理权或本场有效授权') and implies it is for self-fill preparation rather than sending ('不代发'), which hints at when not to use it. However, it does not explicitly name alternatives such as send_guest_invite_now or create_guest_invite_link, so the guidance remains implied.

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