reply_to_merge_request_comment

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

No annotations are provided, so the description bears the full burden. It states the action 'Reply' which implies a write operation, but it does not disclose permissions, side effects, or what happens if the comment cannot be added. The return is only described as 'Confirmation message' without any detail on the structure or potential errors, leaving the agent uncertain about the tool's behavior.

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 and well-structured. It opens with a one-sentence purpose, then lists each parameter with a brief definition, followed by a return statement. There is no unnecessary jargon or filler, making it easy to scan and understand quickly.

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 description gives a high-level return 'Confirmation message with reply details' but does not specify the exact format or content. It also lacks context about error handling, permissions, or when this tool is preferable to alternatives. For a simple reply action, this might be acceptable, but more detail on the output schema or failure scenarios would enhance completeness. The presence of an output schema (though not shown) suggests some expectation, but the description alone is incomplete.

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?

The input schema provides only types, but the description's Args section adds meaningful one-line explanations for each parameter: project_id, mr_iid, discussion_id, and comment. This goes beyond the schema to clarify the purpose of each parameter, such as 'Discussion ID to reply to' and 'Reply comment text.' No constraints or examples are given, but the naming and short descriptions are sufficient for a basic understanding.

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: 'Reply to an existing merge request discussion/comment.' The verb 'reply' and the resource 'merge request discussion/comment' are specific. The word 'existing' distinguishes it from adding a new comment, and the name itself contrasts with sibling tools like add_merge_request_comment.

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 usage for replying to a specific discussion thread, but it does not explicitly say when to choose this over siblings like add_merge_request_comment or update_merge_request_comment. There is no direct guidance such as 'use this when you want to respond within an existing thread, not start a new one.' The context of the name and 'existing' gives a hint, but explicit instructions are missing.

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