AI agents call gitlab_list_branches to retrieve information from GitLab MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays branch data from a GitLab project. It has no side effects, does not modify any data, does not execute code or scripts, and does not delete or overwrite anything. It is a straightforward read/query operation with minimal security risk even if invoked by an AI agent, as the worst outcome would be information disclosure of already-accessible branch names.
From the tool's definition Tool name contains 'list' and description states 'List branches of a GitLab project' — a pure query operation that retrieves repository branch information without modifying, deleting, or executing any code.
Documented attack patterns abuse exactly the kind of access gitlab_list_branches gives an agent:
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_list_branches:
{
"version": "1",
"default": "deny",
"tools": {
"gitlab_list_branches": {}
}
}gitlab_list_branches is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List branches of a GitLab project. It is categorised as a Read tool in the GitLab MCP Server MCP Server, which means it retrieves data without modifying state.
Register the GitLab MCP Server MCP server in PolicyLayer and add a rule for gitlab_list_branches: 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.
gitlab_list_branches is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the gitlab_list_branches 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_list_branches. 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_list_branches 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.
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.
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42 GitLab MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.