Fork an existing project to another namespace.
AI agents use gitlab_fork_repository to create or update resources in Gitlab — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Gitlab environment.
Forking a repository creates a new copy of the project in another namespace. This is a Write operation as it creates new data (a new project/repository) but is reversible (the fork can be deleted). It does not execute code, destroy data, or involve financial transactions. Medium severity because forking could expose repository contents to unintended namespaces or create unauthorized copies.
From the tool's definition Fork an existing project to another namespace
Documented attack patterns abuse exactly the kind of access gitlab_fork_repository gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Gitlab, and nothing reaches the server without passing your rules. This is the rule we recommend for gitlab_fork_repository:
{
"version": "1",
"default": "deny",
"tools": {
"gitlab_fork_repository": {
"limits": [
{
"counter": "gitlab_fork_repository_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}gitlab_fork_repository 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.
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Fork an existing project to another namespace. It is categorised as a Write tool in the Gitlab MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Gitlab MCP server in PolicyLayer and add a rule for gitlab_fork_repository: 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.
gitlab_fork_repository is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the gitlab_fork_repository 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.
Set action: deny in the PolicyLayer policy for gitlab_fork_repository. 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.
gitlab_fork_repository is provided by the Gitlab MCP server (mcpland/gitlab-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Gitlab, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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190 Gitlab tools catalogued and risk-classified — across an index of 43,000+ MCP servers.