AI agents call get_merge_request_commits to retrieve information from Gitlab without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves commit information associated with a merge request. It performs no modifications, deletions, or external operations—purely data retrieval. The blast radius is minimal as it only exposes existing information without changing state.
From the tool's definition Tool name 'get_merge_request_commits' and description 'Get the commits for a merge request' indicate a retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access get_merge_request_commits 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 get_merge_request_commits:
{
"version": "1",
"default": "deny",
"tools": {
"get_merge_request_commits": {}
}
}get_merge_request_commits is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get the commits for a merge request. It is categorised as a Read tool in the Gitlab MCP Server, which means it retrieves data without modifying state.
Register the Gitlab MCP server in PolicyLayer and add a rule for get_merge_request_commits: 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.
get_merge_request_commits 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 get_merge_request_commits 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 get_merge_request_commits. 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.
get_merge_request_commits is provided by the Gitlab MCP server (yoda-digital/mcp-gitlab-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 88 Gitlab tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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88 Gitlab tools catalogued and risk-classified — across an index of 42,500+ MCP servers.