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

Annotations carry only destructiveHint=false, so the description rightly does the heavy lifting: management permission required, no sending on your behalf, no audience expansion, private-activity preconditions, and re-verification of identity/phone/audience at fill time. It also discloses the two-step preview/previewHash confirmation and that changes require re-confirmation — rich context beyond what annotations provide.

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-loads the permission gate and purpose, then layers constraints and the confirmation workflow. Dense but every clause adds a real behavioral constraint; the composition is a bit packed but not padded.

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 non-destructive link-creation tool with a preview/confirm workflow, the definition covers auth, preconditions, safety traits, and the two-step confirmation. With no output schema needed here, the remaining gap is only the absence of explicit sibling differentiation.

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%, so the description must compensate and largely does: it explains targetUserId (required for private activities, requires existing audience eligibility) and the previewHash mechanism (same params + hash, preview=false, re-confirm on change). preview's default is also implied. activityRef itself is not elaborated, which keeps it from a 5.

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+resource (准备...填写链接 / prepare a guest-profile filling link) with scope: 通用/定向 links, 不代发、不扩大受众. This distinguishes it from send_guest_invite_now by noting it doesn't send. However, it never explicitly names or contrasts with the very similar sibling link creators (create_guest_invite_link, create_guest_open_link).

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 clear context: private activities need targetUserId and pre-existing audience eligibility, targeted links go only to the individual, and it doesn't send or expand the audience. The preview→confirm flow is spelled out. Missing is an explicit 'use create_guest_open_link instead when X' routing against the two other link-creation siblings.

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