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

With no annotations, the description carries the burden, but it doesn't disclose much beyond the action: it reads a threaded comment tree, implying it returns a hierarchical structure and comment ids that can be used for replies. It doesn't mention potential pagination, whether it modifies state (it doesn't), or how it handles missing targets, but for a simple read operation, this is adequate.

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 two sentences long and front-loaded with the purpose ('Read the threaded comment tree on a note or article'), followed by practical guidance. No wasted words, though the second sentence is somewhat informal but concise.

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?

This is a straightforward read-only tool with 3 parameters, and the schema provides enums for target_type and sort, which covers much of the parameter details. The description explains the output's purpose (threaded tree, finding comment id) but lacks specifics on the return structure or edge cases (e.g., no comments). Given no output schema and low description coverage, it's adequate but not rich.

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 0%, so the description must compensate, but it only mentions 'comment id' without explicitly explaining how to find it or the purpose of target_type/target_id. It implies target_id is the note/article id, but it doesn't clarify the format (UUID) or the sort parameter, which is fully left to the schema's enum. The description adds minimal value beyond the schema.

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 states the tool reads a threaded comment tree on a note or article, which is a specific verb ('read') and resource ('comment tree'), clearly distinguishing it from siblings like 'comment' (which likely creates a comment). It also implicitly distinguishes from other read tools like 'read_feed' or 'read_post' by targeting comments specifically.

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 gives a clear when-to-use directive: 'Read it before weighing in, and to find the comment id you want to reply to.' This indicates the appropriate context (before replying) but doesn't explicitly mention when not to use it or alternatives, leaving a small gap.

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