create_project_milestone · Linear MCP Server MCP

WHAT IT DOES

What create_project_milestone does on Linear MCP Server

AI agents use create_project_milestone to create or update resources in Linear MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Linear MCP Server environment.

WHY IT NEEDS A POLICY

Why create_project_milestone needs a policy

This tool creates a new milestone, which is a reversible modification to project data. It does not execute arbitrary code, delete data irreversibly, or move money. The severity is medium because creating milestones can affect project planning and team workflows, but the impact is scoped to milestone data and the action can be undone by deleting the milestone.

From the tool's definition Tool name is 'create_project_milestone' and description states it 'Creates a new milestone within a project.' The verb 'creates' indicates a write operation that adds new data to the system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_project_milestone Rate-limited

create_project_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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_project_milestone": {
      "limits": [
        {
          "counter": "create_project_milestone_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Linear MCP Server, so you can run agents against it safely.

FAQ

Questions about create_project_milestone

What does the create_project_milestone tool do? +

Creates a new milestone within a project. It is categorised as a Write tool in the Linear MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_project_milestone? +

Register the Linear MCP Server MCP server in PolicyLayer and add a rule for create_project_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 Linear MCP Server. Nothing to install.

What risk level is create_project_milestone? +

create_project_milestone is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit create_project_milestone? +

Yes. Add a rate_limit block to the create_project_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.

How do I block create_project_milestone completely? +

Set action: deny in the PolicyLayer policy for create_project_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.

What MCP server provides create_project_milestone? +

create_project_milestone is provided by the Linear MCP Server MCP server (sylphxai/linear-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.