// SCAN REPORT

GitLab Code Review MCP

9 tools. 3 can modify or destroy data without limits.

3 write tools that can modify data. Rate limits recommended.

Last updated: 29 Jun 2026

3 can modify or destroy data

6 read-only

9 tools total

Community server · catalogue entry verified 29/06/2026

How to control GitLab Code Review MCP ↓

TOOL MAP

What GitLab Code Review MCP exposes to your agents

Read (6) Write / Execute (3) Destructive / Financial (0)

Running more than one server? Check your whole stack →

MOST DANGEROUS TOOLS

High Risk

The most dangerous GitLab Code Review MCP tools

Write · Medium add_merge_request_comment This tool creates new comments on merge requests, which is a reversible write operation. Write · High approve_merge_request Approving a merge request is a reversible modification of code review state that can enable code deployment. Write · Medium unapprove_merge_request This tool modifies approval state on a merge request, which is a reversible write operation.

3 of GitLab Code Review MCP's 9 tools can modify, destroy, or commit something on every call — and an agent calls them with no built-in limits.

POLICY

How to control GitLab Code Review MCP

PolicyLayer is an MCP gateway — it sits between your AI agents and GitLab Code Review MCP, and nothing reaches the server without passing your rules. These are the rules we recommend:

Rate limit write operations

{
  "add_merge_request_comment": {
    "limits": [
      {
        "counter": "add_merge_request_comment_per_hour",
        "window": "hour",
        "max": 30,
        "scope": "grant"
      }
    ]
  }
}

Prevents bulk unintended modifications from agents caught in loops.

Cap read operations

{
  "compare_versions": {
    "limits": [
      {
        "counter": "compare_versions_per_minute",
        "window": "minute",
        "max": 60,
        "scope": "grant"
      }
    ]
  }
}

Controls API costs and prevents retry loops from exhausting upstream rate limits.

Create a free account and register GitLab Code Review MCP — nothing to install.
Add these rules — paste them, or build them visually. Tune the limits to your setup.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

ENFORCE POLICY ON GITLAB CODE REVIEW →

Instant setup, no code required.

FULL CATALOGUE

All 9 GitLab Code Review MCP tools

WRITE 3 tools

Write add_merge_request_comment add_merge_request_comment Write approve_merge_request approve_merge_request Write unapprove_merge_request Unapprove a merge request.

READ 6 tools

Read compare_versions compare_versions Read fetch_commit_diff fetch_commit_diff Read fetch_merge_request Fetch a GitLab merge request and its contents. Read fetch_merge_request_diff fetch_merge_request_diff Read get_project_merge_requests get_project_merge_requests Read get_review_guidelines Get the code review guidelines.

FAQ

Questions about GitLab Code Review MCP

How do I prevent bulk modifications through GitLab Code Review MCP? +

The GitLab Code Review MCP server has 3 write tools including add_merge_request_comment, approve_merge_request, unapprove_merge_request. Set a rate limit in your policy -- for example, 10 calls per hour prevents an agent from making more than 10 modifications per hour. PolicyLayer enforces this at the gateway, before calls reach GitLab Code Review MCP.

How many tools does the GitLab Code Review MCP server expose? +

9 tools across 2 categories: Read, Write. 6 are read-only. 3 can modify, create, or delete data.

How do I enforce a policy on GitLab Code Review MCP? +

Register the GitLab Code Review MCP server in PolicyLayer, apply the suggested rules above (adjust the limits to your use case), and point your AI client at the PolicyLayer proxy URL instead of the server directly. Your agents keep the same tools; PolicyLayer evaluates every call against policy before it executes. Nothing to install, live in minutes.

Enforce policy on every GitLab Code Review MCP tool call.

Deterministic rules across all 9 GitLab Code Review MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

ENFORCE POLICY ON GITLAB CODE REVIEW →

Instant setup, no code required.

9 GitLab Code Review MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.