gitlab_add_project_member

THE RISK

Medium Risk

Why gitlab_add_project_member needs a policy

This tool creates or modifies project membership, granting a user access to a GitLab project. While reversible (a member can be removed later), it has a high severity because an AI agent could inadvertently grant broad access to sensitive projects, expose private repositories, or compromise project security by adding unintended users.

From the tool's definition Tool name 'gitlab_add_project_member' and description 'Add a user to a project' indicate creation/modification of project membership records.

Documented attack patterns abuse exactly the kind of access gitlab_add_project_member gives an agent:

POLICY

How to control gitlab_add_project_member

PolicyLayer is an MCP gateway — it sits between your AI agents and GitLab MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for gitlab_add_project_member:

policy.json

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

gitlab_add_project_member 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.

Create a free account and register GitLab MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More GitLab MCP Server tools

Destructive gitlab_delete_cicd_variable Delete a CI/CD variable Destructive gitlab_delete_trigger_token Delete a pipeline trigger token Destructive gitlab_delete_webhook Delete a webhook Execute gitlab_trigger_pipeline Trigger a pipeline run Execute gitlab_test_webhook Test a webhook Write gitlab_add_group_member Add a user to a group Write gitlab_add_webhook Add a new webhook to a project Write gitlab_create_cicd_variable Create a new CI/CD variable

All 42 GitLab MCP Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about gitlab_add_project_member

What does the gitlab_add_project_member tool do? +

Add a user to a project. It is categorised as a Write tool in the GitLab MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on gitlab_add_project_member? +

Register the GitLab MCP Server MCP server in PolicyLayer and add a rule for gitlab_add_project_member: 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 Server. Nothing to install.

What risk level is gitlab_add_project_member? +

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

Can I rate-limit gitlab_add_project_member? +

Yes. Add a rate_limit block to the gitlab_add_project_member 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_add_project_member completely? +

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

gitlab_add_project_member is provided by the GitLab MCP Server MCP server (rifqi96/mcp-gitlab). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every GitLab MCP Server tool call.

Start from GitLab MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →