dir_create · Android MCP Server MCP: Risk & Policy

WHAT IT DOES

What dir_create does on Android MCP Server

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

WHY IT NEEDS A POLICY

Why dir_create needs a policy

This tool creates directories on an Android device, which is a reversible write operation. While it modifies filesystem state, it does not permanently destroy data or execute arbitrary code. The 'mkdir -p' behavior mentioned automatically creates parent directories if they don't exist and silently succeeds if the directory already exists.

From the tool's definition Tool name 'dir_create' and description '创建目录（mkdir -p 行为）' indicates directory creation with mkdir -p behavior, which creates new filesystem objects.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

dir_create Rate-limited

dir_create 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": {
    "dir_create": {
      "limits": [
        {
          "counter": "dir_create_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 Android MCP Server, so you can run agents against it safely.

FAQ

Questions about dir_create

What does the dir_create tool do? +

📁 创建目录（mkdir -p 行为）。自动创建所有父目录，已存在不报错。. It is categorised as a Write tool in the Android 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 dir_create? +

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

What risk level is dir_create? +

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

Can I rate-limit dir_create? +

Yes. Add a rate_limit block to the dir_create 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 dir_create completely? +

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

dir_create is provided by the Android MCP Server MCP server (wujie272/android-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.