gitlab_get_mr_diff

Show the file diff of a merge request.

SERVERGitlab SOURCEdkeeno/gitlab-mcp-server

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/dkeeno-gitlab-mcp-server/gitlab-get-mr-diff.md

WHAT IT DOES

What gitlab_get_mr_diff does on Gitlab

AI agents call gitlab_get_mr_diff to retrieve information from Gitlab without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why gitlab_get_mr_diff is rated Low

This tool retrieves and displays differences between files in a merge request. It performs a query/read operation without modifying, deleting, or executing any code. The blast radius if misused is minimal—an AI agent could only access existing diff information, not alter repositories or trigger operations.

From the tool's definition Tool name contains 'get' and description explicitly states 'Show the file diff of a merge request' — a retrieval operation with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs gitlab_get_mr_diff safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Gitlab, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For gitlab_get_mr_diff, this is the rule to start with:

gitlab_get_mr_diff Allowed

gitlab_get_mr_diff is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "gitlab_get_mr_diff": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Gitlab, apply this rule, and every gitlab_get_mr_diff call is checked against it from then on.

FAQ

Questions about gitlab_get_mr_diff

What does the gitlab_get_mr_diff tool do? +

Show the file diff of a merge request. It is categorised as a Read tool in the Gitlab MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on gitlab_get_mr_diff? +

Register the Gitlab MCP server in PolicyLayer and add a rule for gitlab_get_mr_diff: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Gitlab. Nothing to install.

What risk level is gitlab_get_mr_diff? +

gitlab_get_mr_diff is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit gitlab_get_mr_diff? +

Yes. Add a rate_limit block to the gitlab_get_mr_diff rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block gitlab_get_mr_diff completely? +

Set action: deny in the PolicyLayer policy for gitlab_get_mr_diff. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides gitlab_get_mr_diff? +

gitlab_get_mr_diff is provided by the Gitlab MCP server (dkeeno/gitlab-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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