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

Annotations only declare destructiveHint=false, so the description carries the real burden and does: login required, the moment author (and the replied-to user) receive notifications, the content is externally visible, and the user must confirm the text before posting. That last point is genuine pre-flight guidance not encoded anywhere in structured fields. Minor note: it says 1–500 characters while the schema's maxLength is 1000, so the stricter limit in prose is the one to follow.

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?

Three bracketed, front-loaded blocks (precondition/mode, tool chain, cautions) with no filler sentences. Slightly terse and jargon-tagged, and the character-limit statement duplicates the schema while conflicting with its maxLength, which is the only small structural blemish.

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 3-parameter mutation tool with no output schema and thin annotations, it covers auth, required inputs, ID sourcing, recipient side effects, visibility, and a confirmation step. The only omission is whether the created comment's ID is returned, which is not relevant without an output schema.

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, but the description adds effect-level meaning beyond the field docs: passing replyToCommentId means replying to that specific comment and triggers a notification to that person, while omitting it means a top-level comment. That behavioral difference is more than the schema's "不传 = 直接评论" phrasing conveys.

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 ("以用户名义在一条消息圈下评论") and immediately distinguishes the two modes via replyToCommentId, which separates it from publish_moment, like_moment, and delete_my_moment in the sibling list. An agent can tell what this does and what it is not 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?

Explicitly names the predecessor tools that produce the required IDs (list_moments_feed / get_moment) and routes a distinct task (replying to received interactions) to list_moment_notices first. It also states the login precondition, so the agent knows when the call will fail rather than succeed.

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