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

On top of annotations that already declare the read-only/safe profile, the description discloses useful behavioral traits: a hard 50-item cap, that only the newest comments appear, that hidden comments are flagged, and the first-name-only naming rule across the age line. It stops short of explaining pagination or how to reach older comments.

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?

A single front-loaded sentence that names the resource, the limit, and the return fields with no filler. The em-dash clause is slightly run-on but every clause carries 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 one-parameter read tool with an output schema and full safety annotations, the description is largely complete: it covers scope, limit, field shape, and visibility marking. Only pagination/access to older comments is unaddressed.

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% and there is a single required postId already documented as 'From list_posts.' The description's 'under one post' adds little beyond the schema, so the baseline 3 applies.

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 resource and scope ('the comments under one post') plus concrete return detail (newest 50, commentId, words, when, who). The framing 'as the channel's people see them' with 'Hidden ones are marked' distinguishes it from a moderation-oriented sibling like moderate_comment.

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?

Usage is only implied: the 'one post' scoping and the schema's 'From list_posts' hint at the prerequisite, but the description never says when to reach for this tool versus siblings such as list_posts or read_conversation, nor any when-not condition.

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