gitlab mcp

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states what the tool does ('Get changes/diffs') but doesn't describe important behavioral aspects: whether this is a read-only operation, what format the diffs are returned in (e.g., unified diff, patch format), whether there are rate limits, authentication requirements, or pagination behavior (especially relevant given the 'full_diff' parameter). The description is minimal and lacks crucial operational context.

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 extremely concise - a single sentence with zero wasted words. It's front-loaded with the core purpose. Every word earns its place: 'Get' (action), 'changes/diffs' (what), 'of a specific commit' (scope). This is a model of efficiency in tool description writing.

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 3 parameters, no annotations, and no output schema, the description is inadequate. It doesn't explain what the tool returns (diff format, structure), doesn't mention authentication or rate limits, and provides no usage context. While the schema covers parameter documentation, the overall operational context is missing. The description should do more given the complexity and lack of supporting structured data.

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 three parameters thoroughly. The description doesn't add any parameter-specific information beyond what's in the schema. It doesn't explain the relationship between parameters (e.g., that 'project_id' might be optional for some contexts, or how 'full_diff' affects performance). The baseline of 3 is appropriate when the schema does the heavy lifting.

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 changes/diffs of a specific commit' - a specific verb ('Get') and resource ('changes/diffs of a specific commit'). It distinguishes from siblings like 'get_commit' (which likely retrieves commit metadata) and 'get_branch_diffs' (which focuses on branch comparisons). However, it doesn't explicitly differentiate from 'get_merge_request_diffs' or 'list_merge_request_diffs', which are similar diff-related tools.

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 no guidance on when to use this tool versus alternatives. It doesn't mention when to choose 'get_commit_diff' over 'get_merge_request_diffs', 'get_branch_diffs', or 'list_merge_request_diffs' - all of which are sibling tools that also retrieve diffs. There's no context about prerequisites, timing, or exclusions.

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