Post a reply to a comment thread

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

With no annotations provided, the description carries the full burden of disclosure. It clearly indicates this is a write operation by stating it 'adds a new message' and gives a concrete behavioral effect: 'appears immediately in Overleaf's review panel for collaborators.' This goes beyond the schema, though it omits potential side effects like notifications or error conditions.

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 concise, composed of three short sentences, each adding essential information: the core action, how to obtain thread IDs, and the immediate visibility effect. No filler or redundancy.

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 two-parameter tool with no output schema, the description covers the key aspects: what it does, where thread_ids come from, and the result of the action. It omits any prerequisites (e.g., project ownership, open project) but given the straightforward scope, it is sufficiently complete.

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% for both parameters, with thread_id already referencing list_comments. The description's separate mention of list_comments adds no new parameter meaning beyond what the schema provides, so the baseline 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 the action ('Adds a new message') and the target resource ('existing comment thread'), which immediately distinguishes it from siblings like resolve_comment or reopen_comment. The title reinforces this, and the mention that threads come from list_comments further anchors its purpose.

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 implies the correct usage workflow: first obtain a thread via list_comments, then use this tool with the thread_id. It provides clear context for when to use this tool, though it does not explicitly state when not to use it or name alternative tools for different actions (e.g., resolving).

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