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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds ordering ('oldest first'), the returned fields, and an auth requirement (Cotlet API key with access to this app), which is genuine context beyond the structured fields, though pagination behavior is not mentioned.

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 resource and scope, and each sentence carries information (fields, ordering, ID linkage, auth). Four sentences is slightly more than strictly necessary but none is filler.

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?

No output schema, so the description usefully covers return shape (author, neighborhood, text, replied flag) and ordering. Combined with annotations carrying the safety profile, an agent has enough to call it correctly; only pagination/volume behavior is unstated.

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 both post_id and unanswered_only are already documented in the schema. The description implies the post-scoping but adds no syntax or format detail beyond the schema, so 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 verb (list) and resource (comments) with scope ('on one of your posts') and enumerates returned fields. It is easily distinguished from nextdoor_list_posts and nextdoor_get_post, and it links to the sibling nextdoor_reply_to_comment, so the agent knows exactly what this returns.

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?

Clear context: this reads comments belonging to one of your own posts, and the ID it returns is what reply_to_comment consumes, which routes the agent through the reply workflow. It stops short of an explicit when-to-use/when-not statement against e.g. list_posts.

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