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

Annotations only declare destructiveHint=false, so the description carries the real behavioral load and does: login and organizer role required, the link is a 14-day secret key, each call mints a new link while old cards stay valid for their lifetime, and the link must never be shared to groups or public pages. This is exactly the security and lifecycle context an agent needs before creating a credential-bearing link.

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?

Front-loaded with the access tag and purpose, then constraints, with no filler sentences. It is dense and semicolon-chained, which slightly hurts scanability but every clause carries distinct information.

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 two-parameter tool with no output schema, the description covers workflow, prerequisites, link lifetime, idempotency behavior, and sharing restrictions — nothing material is missing for correct invocation.

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 100%, so the baseline is 3; the description adds value by naming concrete sources for the two ids (list_activity_guests / add_activity_guest for guestId), reinforcing the schema's own hint. It adds no format or constraint detail beyond that.

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?

States a specific verb and resource ('为嘉宾生成免登录自助卡') and lists what the card lets the guest do (confirm attendance, edit title/topic, upload avatar/PPT), which is far more concrete than the title alone. It does not, however, distinguish itself from close siblings such as create_guest_open_link or create_guest_collection_link, which an agent must choose between.

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?

Gives an explicit call sequence: obtain guestId via list_activity_guests/add_activity_guest → this tool → after confirmation, send_message to the person (start_conversation first for in-site chat). It also states a hard precondition ('仅公开场次可建'), so when-not-to-use is unambiguous.

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