uselink_reply_comment

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It mentions the nesting behavior but does not disclose that this is a write/mutation operation (though implied by 'post'), nor any effects on the document, permissions required, reversibility, or return value. This is a significant gap for a write tool with no annotation support.

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?

The description is a single concise sentence, front-loaded with the action ('Post a reply'), and every phrase adds value. No fluff or repetition.

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?

The tool has 3 required parameters, no annotations, no output schema, and the description is minimal. It explains the intent but lacks essential context for a write operation: no return value, no error conditions, no permissions, no follow-up behavior. For a tool of this complexity, the description is under-specified (compare with the update_drive example).

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 67%, with body and parent_comment_id well-described in the schema, but document_id lacks semantic description beyond format. The tool description does not add extra meaning to any parameter; it only says 'on a uselink document' which loosely maps to document_id. Overall, the schema does most of the work, so a baseline score of 3 is appropriate.

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?

The description clearly states a specific action ('Post a reply') and the resource ('existing comment thread on a uselink document'), with additional structural detail ('Replies are nested under the parent comment'). This unambiguously distinguishes it from sibling tools like uselink_resolve_comment or uselink_list_comments.

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 description provides clear context: use this tool to reply to an existing comment thread. It does not explicitly name alternatives or exclusions, but the contextual cue 'existing comment' implies prerequisites (the comment must exist), and the verb 'reply' differentiates it from resolve/list tools. Lacks explicit 'when not to use' guidance, so not a 5.

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