Inline MR diff comment

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

Annotations already indicate mutability (not read-only, not destructive). The description adds context that it creates a thread on a specific diff line. No contradiction, and it discloses the core 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 two sentences: first states the purpose, second adds permission requirement. No filler or redundancy; front-loaded and 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?

Despite 9 parameters and no output schema, the description omits important details like mutual exclusivity of new_line/old_line, error scenarios, or what a 'review thread' entails. This leaves gaps for a complete understanding.

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%, so the schema already documents all parameters. The description briefly mentions 'new_line or old_line' but adds no additional parameter-level meaning 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 clearly states the action (creates a review thread) on a specific resource (diff line) with file and line identifiers. It distinguishes from sibling tools like gitlab_get_mr_discussions which retrieves threads.

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 mentions a prerequisite (write permissions) but does not provide guidance on when to use this tool versus alternatives like gitlab_prepare_review or gitlab_manage_merge_requests.

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