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

Annotations only declare it is a non-idempotent, non-destructive write. The description adds meaningful context beyond that: login required, notifications fired to the author (and the replied-to user), public visibility, and a confirmation-before-sending policy. This is exactly the extra behavioral context a mutation tool needs.

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?

Bracketed sections (login / chain / caveats) front-load the auth requirement and keep the operational routing tight. It is somewhat dense, but nearly every clause carries actionable 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?

With no output schema, the description still covers auth, side effects (notifications), visibility policy, the ID-sourcing chain, and content constraints. An agent has everything needed to invoke it correctly.

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 reinforces replyToCommentId's meaning and its notification consequence, but also introduces a character-limit conflict: it says 正文 1 到 500 字 while the schema's content maxLength is 1000, which could mislead on length boundaries.

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 (评论/comment) and resource (消息圈/moment), and explicitly covers both modes: a direct comment and a reply when replyToCommentId is passed. An agent can distinguish it from sibling tools like like_moment or publish_moment 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?

The 【组合链】 section gives explicit prerequisites and alternatives: fetch momentId/commentId via list_moments_feed or get_moment, and use list_moment_notices first when replying to interactions received. When-to-use and sibling routing are both spelled out.

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