Create a milestone.
AI agents use gitlab_create_milestone 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.
Creating a milestone is a reversible write operation that modifies project data by adding a new milestone. It does not execute arbitrary code, delete data, or move money. The severity is medium because inappropriate milestone creation could clutter project management systems and potentially confuse workflows, but milestones can be deleted or modified to undo the action.
From the tool's definition Tool name is 'gitlab_create_milestone' and description states 'Create a milestone.' This performs a create operation that adds a new milestone object to a GitLab project.
Documented attack patterns abuse exactly the kind of access gitlab_create_milestone 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_create_milestone:
{
"version": "1",
"default": "deny",
"tools": {
"gitlab_create_milestone": {
"limits": [
{
"counter": "gitlab_create_milestone_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}gitlab_create_milestone 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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Create a milestone. 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_create_milestone: 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_create_milestone 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_create_milestone 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_create_milestone. 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_create_milestone 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.