list_merge_request_diffs

List merge request diffs with pagination (mergeRequestIid or branchName required)

SERVERGitlab Mcp SOURCE@zereight/mcp-gitlab

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/io-github-zereight-gitlab-mcp/list-merge-request-diffs.md

WHAT IT DOES

What list_merge_request_diffs does on Gitlab Mcp

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

RISK

Why list_merge_request_diffs is rated Low

This tool retrieves and displays diff information associated with merge requests. It performs a query operation with no side effects—it does not create, modify, delete, or execute any code. The pagination parameter further indicates this is a standard read/retrieval endpoint.

From the tool's definition Tool name contains 'list' and description specifies it 'List[s] merge request diffs' — retrieval operation with no modification or destructive capability. Parameters are identifiers (mergeRequestIid, branchName) used for filtering/querying.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_merge_request_diffs safely

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

list_merge_request_diffs Allowed

list_merge_request_diffs 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": {
    "list_merge_request_diffs": {}
  }
}

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

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

FAQ

Questions about list_merge_request_diffs

What does the list_merge_request_diffs tool do? +

List merge request diffs with pagination (mergeRequestIid or branchName required). It is categorised as a Read tool in the Gitlab Mcp MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_merge_request_diffs? +

Register the Gitlab MCP server in PolicyLayer and add a rule for list_merge_request_diffs: 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 Mcp. Nothing to install.

What risk level is list_merge_request_diffs? +

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

Can I rate-limit list_merge_request_diffs? +

Yes. Add a rate_limit block to the list_merge_request_diffs 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 list_merge_request_diffs completely? +

Set action: deny in the PolicyLayer policy for list_merge_request_diffs. 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 list_merge_request_diffs? +

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

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