input_key · React Native MCP: Risk & Policy

WHAT IT DOES

What input_key does on React Native

AI agents invoke input_key to trigger actions in React Native. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why input_key needs a policy

This tool triggers external operations on a device by sending key events. It can simulate user interactions like pressing Enter or Back, which could trigger navigation, form submissions, or other UI actions. This is an Execute-category action as it runs device-level operations whose effects depend on the arguments provided and the current app state.

From the tool's definition Send key event to device (Return, Backspace, ENTER, BACK, etc.)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

input_key Rate-limited

input_key stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "input_key": {
      "limits": [
        {
          "counter": "input_key_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about input_key

What does the input_key tool do? +

Send key event to device (Return, Backspace, ENTER, BACK, etc.). It is categorised as a Execute tool in the React Native MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on input_key? +

Register the React Native MCP server in PolicyLayer and add a rule for input_key: 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 React Native. Nothing to install.

What risk level is input_key? +

input_key is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit input_key? +

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

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

input_key is provided by the React Native MCP server (@ohah/react-native-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.