create_directory · Test MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_directory does on Test MCP Server

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

WHY IT NEEDS A POLICY

Why create_directory needs a policy

Creating a directory is a reversible Write operation—it modifies filesystem state by adding a new directory, but can be undone by deleting the directory. It does not execute arbitrary code, delete data irreversibly, or move money. Severity is medium because an agent could create many directories and consume disk space or clutter the filesystem, but the impact is contained and reversible.

From the tool's definition Tool name is 'create_directory' and description states it 'Creates a new directory.' This is a data modification operation that creates a new filesystem artifact.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_directory Rate-limited

create_directory 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_directory": {
      "limits": [
        {
          "counter": "create_directory_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about create_directory

What does the create_directory tool do? +

Creates a new directory. It is categorised as a Write tool in the Test 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_directory? +

Register the Test MCP Server MCP server in PolicyLayer and add a rule for create_directory: 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 Test MCP Server. Nothing to install.

What risk level is create_directory? +

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

Can I rate-limit create_directory? +

Yes. Add a rate_limit block to the create_directory 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_directory completely? +

Set action: deny in the PolicyLayer policy for create_directory. 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_directory? +

create_directory is provided by the Test MCP Server MCP server (jojodiaz/mcp-local-context). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.