rpc_type_text · Rpcclient MCP: Risk & Policy

WHAT IT DOES

What rpc_type_text does on Rpcclient

AI agents invoke rpc_type_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_text needs a policy

This tool executes an action (typing text) on a remote iOS device. It has real side effects: it can fill form fields, send messages, submit queries, or enter credentials in any app. Misuse could lead to unintended data submission, account changes, or exposure of sensitive input fields.

From the tool's definition 'Type text by explicit label, semantic intent, or anchor-relative targeting' — actively triggers keyboard input into a running iOS application via RPC automation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

rpc_type_text Rate-limited

rpc_type_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_text": {
      "limits": [
        {
          "counter": "rpc_type_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_text

What does the rpc_type_text tool do? +

Type text by explicit label, semantic intent, or anchor-relative targeting. 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_text? +

Register the Rpcclient MCP server in PolicyLayer and add a rule for rpc_type_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_text? +

rpc_type_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_text? +

Yes. Add a rate_limit block to the rpc_type_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_text completely? +

Set action: deny in the PolicyLayer policy for rpc_type_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_text? +

rpc_type_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.