create_merge_request_thread

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

With no annotations, the description carries the full behavioral disclosure burden, but it only states 'Create a new thread,' which implies mutation without explaining side effects. It does not mention whether position is needed for diff comments, how this thread relates to resolvable discussions, or what the endpoint returns.

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 a single, focused sentence with no filler or unnecessary wording. However, it closely paraphrases the tool name and provides little beyond the obvious purpose, so it is concise but not especially information-dense.

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 tool with five parameters, a deeply nested position schema, no output schema, and no annotations, the description is too thin to be contextually complete. It does not explain the thread-versus-note distinction, when position is required for diff comments, or how the tool fits into the merge request discussion workflow.

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 input schema already documents all parameters, including the complex position object and its line_range validation rules. The tool description itself adds no parameter-level meaning, but it does not need to because the schema is comprehensive.

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 ('Create') and resource ('a new thread on a merge request'), making the core purpose clear. It does not explicitly contrast with sibling tools like create_merge_request_discussion_note or create_merge_request_note, but the qualifier 'new thread' partially distinguishes it from operations that add to an existing 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?

There is no guidance on when to use this tool versus alternatives, such as when to create a discussion note in an existing thread or use a general MR note. The nested schema implies it can be used for diff comments, but the description itself does not state any conditions, prerequisites, or exclusions.

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