migrate-new · MCP Atlas MCP: Risk & Policy

WHAT IT DOES

What migrate-new does on MCP Atlas

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

WHY IT NEEDS A POLICY

Why migrate-new needs a policy

This tool creates a new migration file, which is a reversible write operation. It does not execute migrations (which would be Execute), delete files (Destructive), or modify financial data. While creating migration files is generally safe, misuse by an AI agent could create numerous spurious migration files that clutter the codebase or confuse the version control history, warranting a medium severity rating.

From the tool's definition Tool name 'migrate-new' and description 'Create a new empty migration file in the migration directory' indicate file creation within the migration system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

migrate-new Rate-limited

migrate-new 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": {
    "migrate-new": {
      "limits": [
        {
          "counter": "migrate-new_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 MCP Atlas, so you can run agents against it safely.

FAQ

Questions about migrate-new

What does the migrate-new tool do? +

Create a new empty migration file in the migration directory. It is categorised as a Write tool in the MCP Atlas MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on migrate-new? +

Register the MCP Atlas MCP server in PolicyLayer and add a rule for migrate-new: 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 MCP Atlas. Nothing to install.

What risk level is migrate-new? +

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

Can I rate-limit migrate-new? +

Yes. Add a rate_limit block to the migrate-new 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 migrate-new completely? +

Set action: deny in the PolicyLayer policy for migrate-new. 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 migrate-new? +

migrate-new is provided by the MCP Atlas MCP server (mpreziuso/mcp-atlas). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.