gitlab mcp

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. The description only mentions the parameter requirement without detailing behavioral traits such as whether this is a read-only operation, what the output format looks like (e.g., diff structure), or any rate limits or permissions needed. This leaves significant gaps for a tool that retrieves data.

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, efficient sentence that front-loads the core purpose and includes essential usage information. There is no wasted text, and it directly addresses key aspects without unnecessary elaboration, making it highly concise and well-structured.

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?

Given the complexity of retrieving merge request diffs, no annotations, and no output schema, the description is incomplete. It lacks details on behavioral traits (e.g., read-only nature, output format), doesn't differentiate from sibling tools, and provides minimal guidance on usage. For a tool with 4 parameters and no structured safety or output information, this is inadequate.

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 thoroughly. The description adds minimal value by emphasizing that 'Either mergeRequestIid or branchName must be provided,' which clarifies a conditional requirement not explicitly stated in the schema. However, it doesn't add significant semantic context beyond what the schema provides, aligning with the baseline for high coverage.

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 tool's purpose: 'Get the changes/diffs of a merge request.' It specifies the verb ('Get') and resource ('changes/diffs of a merge request'), making the action explicit. However, it doesn't differentiate from sibling tools like 'get_branch_diffs' or 'get_commit_diff', which also retrieve diffs but for different resources, so it lacks sibling differentiation.

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 provides implied usage guidance by stating 'Either mergeRequestIid or branchName must be provided,' which helps understand parameter requirements. However, it doesn't explicitly state when to use this tool versus alternatives like 'get_branch_diffs' or 'get_commit_diff,' nor does it mention any exclusions or prerequisites for usage.

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