Reply to comment

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

Annotations already disclose this is a non-read-only, non-idempotent, non-destructive, open-world write operation. The description adds the useful source of 'comment_id,' but does not explain what a reply does to the thread, whether permissions are required, or what a repeated call does beyond the non-idempotent annotation.

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 short sentences with no filler; the core action is front-loaded and the provenance note is compact. It could be slightly more informative without becoming verbose, but it is efficient.

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 simple three-parameter mutation, annotations cover the safety profile and the description covers the action and comment ID source. However, with no output schema and incomplete parameter coverage, it omits content expectations and return behavior, leaving some gaps an agent might need.

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 only 33%: 'project_id' is described in the schema, while 'comment_id' and 'content' are not. The description usefully explains where 'comment_id' comes from, but it says nothing about 'content' format (plain text, markdown, limits) and adds little for 'project_id' beyond the schema example.

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 uses a specific verb and resource: 'Reply to a comment thread.' This clearly separates it from non-thread operations, though it does not explicitly contrast with the sibling tool 'typst_add_comment' beyond the word 'thread.'

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 useful provenance for 'comment_id' ('comes from typst_list_comments'), implying it should be called after listing comments. However, it does not say when to choose this over 'typst_add_comment' or 'typst_resolve_comment,' nor does it mention preconditions or exclusions.

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