protect_branch · Mcp Gitlab MCP: Risk & Policy

WHAT IT DOES

What protect_branch does on Mcp Gitlab

AI agents use protect_branch to create or update resources in Mcp Gitlab — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Gitlab environment.

WHY IT NEEDS A POLICY

Why protect_branch needs a policy

This tool modifies repository access controls and branch protection policies, which are reversible configuration changes (Write category). It is not Destructive because branch protections can be removed or re-configured. It is not Execute because it doesn't run arbitrary code or trigger external operations—it configures access permissions.

From the tool's definition Tool modifies branch protection settings by setting access levels for push/merge/unprotect operations. Description states it 'Protect a branch with given push/merge/unprotect access levels', which is a configuration change to repository security controls.

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

protect_branch Rate-limited

protect_branch stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "protect_branch": {
      "limits": [
        {
          "counter": "protect_branch_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Mcp Gitlab, so you can run agents against it safely.

FAQ

Questions about protect_branch

What does the protect_branch tool do? +

Protect a branch with given push/merge/unprotect access levels. Access levels: 0=NoAccess, 30=Developer, 40=Maintainer, 60=Admin. dry_run=true by default. It is categorised as a Write tool in the Mcp Gitlab MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on protect_branch? +

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

What risk level is protect_branch? +

protect_branch is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit protect_branch? +

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

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

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