GitLab MCP Server

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

No annotations are provided, so the description carries full burden. It states 'List labels' which implies a read-only operation, but doesn't disclose behavioral traits like pagination, rate limits, authentication requirements, error conditions, or what the output looks like (e.g., array of label objects). For a list operation with zero annotation coverage, this is a significant gap.

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?

Extremely concise with a single sentence 'List labels for a project' that front-loads the core purpose. There is zero wasted text, making it easy to parse quickly. Every word earns its place.

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 no annotations and no output schema, the description is incomplete for a list tool with 4 parameters. It lacks details on behavior (e.g., pagination, sorting), output format, error handling, and usage context. While concise, it doesn't provide enough information for an agent to confidently invoke the tool beyond the basic purpose.

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 fully documents all 4 parameters. The description adds no parameter-specific information beyond implying 'project_id' is needed. With high schema coverage, the baseline is 3, as the description doesn't compensate but also doesn't detract.

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 'List labels for a project' clearly states the action (list) and resource (labels), with context (for a project). It distinguishes from siblings like 'get_label' (singular) and 'create_label', but doesn't explicitly differentiate from other list tools like 'list_issues' or 'list_merge_requests' beyond the resource type.

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?

No guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., needing project access), compare to 'get_label' for single label retrieval, or specify scenarios where filtering parameters are useful. The description alone provides minimal context for decision-making.

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