rpc_type_focused_text · Rpcclient MCP: Risk & Policy

WHAT IT DOES

What rpc_type_focused_text does on Rpcclient

AI agents invoke rpc_type_focused_text to trigger actions in Rpcclient. 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 rpc_type_focused_text needs a policy

This tool inputs arbitrary text into a focused UI element on an iOS device, triggering real keyboard interactions and potentially submitting forms, entering credentials, or performing sensitive actions. It is an external operation whose effects depend entirely on the arguments passed and the current focused context, making it Execute.

From the tool's definition Type text into the currently focused element

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

rpc_type_focused_text Rate-limited

rpc_type_focused_text 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": {
    "rpc_type_focused_text": {
      "limits": [
        {
          "counter": "rpc_type_focused_text_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 Rpcclient, so you can run agents against it safely.

FAQ

Questions about rpc_type_focused_text

What does the rpc_type_focused_text tool do? +

Type text into the currently focused element (useful when Safari overlay fields are not AX-exposed). It is categorised as a Execute tool in the Rpcclient MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on rpc_type_focused_text? +

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

What risk level is rpc_type_focused_text? +

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

Can I rate-limit rpc_type_focused_text? +

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

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

rpc_type_focused_text is provided by the Rpcclient MCP server (appknox/rpcclient-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.