AI agents call gitlab_list_branches to retrieve information from Sage MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only operation that retrieves a list of branches from a GitLab repository. It has no capability to create, modify, delete, or execute anything. The blast radius of misuse is minimal—an attacker could only enumerate branches, which is typically non-sensitive metadata. The low severity reflects the informational nature of the data retrieved.
From the tool's definition Tool name is 'gitlab_list_branches' and description states 'List repository branches' — a query operation that retrieves data without modification or side effects.
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 Sage MCP, 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 repository branches. It is categorised as a Read tool in the Sage MCP MCP Server, which means it retrieves data without modifying state.
Register the Sage 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 Sage MCP. 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 Sage MCP server (sagemcp/sagemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 359 Sage MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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359 Sage MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.