Accessibility-Tool · Android MCP: Risk & Policy

WHAT IT DOES

What Accessibility-Tool does on Android

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

WHY IT NEEDS A POLICY

Why Accessibility-Tool needs a policy

An AI agent can call Accessibility-Tool faster than any human can review — one bad instruction and it creates or modifies resources in Android by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

Accessibility-Tool Rate-limited

Accessibility-Tool 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": {
    "Accessibility-Tool": {
      "limits": [
        {
          "counter": "accessibility-tool_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, so you can run agents against it safely.

FAQ

Questions about Accessibility-Tool

What does the Accessibility-Tool tool do? +

Control accessibility features and settings. It is categorised as a Write tool in the Android MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on Accessibility-Tool? +

Register the Android MCP server in PolicyLayer and add a rule for Accessibility-Tool: 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. Nothing to install.

What risk level is Accessibility-Tool? +

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

Can I rate-limit Accessibility-Tool? +

Yes. Add a rate_limit block to the Accessibility-Tool 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 Accessibility-Tool completely? +

Set action: deny in the PolicyLayer policy for Accessibility-Tool. 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 Accessibility-Tool? +

Accessibility-Tool is provided by the Android MCP server (tomdwipo/agent). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.