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Alosies

GitLab MCP Server

by Alosies

get_commit_diff

Retrieves the code changes (diff) for a specified commit, identified by SHA or branch, within a GitLab project.

Instructions

Get changes/diffs of a specific commit

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
shaYesThe commit hash or name of a repository branch or tag
project_idYesProject ID or path
Behavior2/5

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

With no annotations, the description must disclose behavior. It only states it's a read operation ('Get'), but provides no details on output format, pagination, or authentication requirements. The term 'diffs' is vague without specifying structure.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

A single, concise sentence that immediately conveys the tool's purpose with no unnecessary words or repetition.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the lack of output schema and annotations, the description fails to provide sufficient context about what the diff contains (e.g., files, line changes) or how it differs from similar tools. It is too minimal for an agent to fully understand the output.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% and already describes both parameters (sha, project_id). The description adds no extra context beyond the schema, so it meets the baseline for high coverage.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb 'Get' and the resource 'changes/diffs of a specific commit'. It effectively distinguishes from sibling tools such as get_commit (no diffs) and get_branch_diffs (diffs for a branch).

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is provided on when to use this tool versus alternatives like get_branch_diffs or get_merge_request_diffs. There is no mention of prerequisites or conditions.

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

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