create_module · McFlow MCP: Risk & Policy

WHAT IT DOES

What create_module does on McFlow

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

WHY IT NEEDS A POLICY

Why create_module needs a policy

The tool creates new artifacts (code modules) that are shared across workflows, making it a Write operation. It is reversible (modules can typically be deleted or updated), so it does not rise to Destructive.

From the tool's definition Tool description states it will 'Create a shared code module' — this is a creation action that modifies the workflow system by adding new reusable code components.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_module Rate-limited

create_module 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_module": {
      "limits": [
        {
          "counter": "create_module_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 McFlow, so you can run agents against it safely.

FAQ

Questions about create_module

What does the create_module tool do? +

Create a shared code module that can be used across workflows. It is categorised as a Write tool in the McFlow 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_module? +

Register the McFlow MCP server in PolicyLayer and add a rule for create_module: 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 McFlow. Nothing to install.

What risk level is create_module? +

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

Can I rate-limit create_module? +

Yes. Add a rate_limit block to the create_module 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_module completely? +

Set action: deny in the PolicyLayer policy for create_module. 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_module? +

create_module is provided by the McFlow MCP server (mckinleymedia/mcflow-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.