register_ios_device · HC3 MCP Server MCP: Risk & Policy

WHAT IT DOES

What register_ios_device does on HC3 MCP Server

AI agents use register_ios_device to create or update resources in HC3 MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your HC3 MCP Server environment.

WHY IT NEEDS A POLICY

Why register_ios_device needs a policy

This tool creates a new device entry in the HC3 smart home system, which is a reversible write operation. While it modifies system state by adding a device, it does not delete data (Destructive), execute arbitrary code (Execute), involve financial transactions (Financial), or require read-only access (Read).

From the tool's definition Tool name is 'register_ios_device' and description states 'Register a new iOS device'. The verb 'register' indicates a write operation that creates a new record/entry in the system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

register_ios_device Rate-limited

register_ios_device 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": {
    "register_ios_device": {
      "limits": [
        {
          "counter": "register_ios_device_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 HC3 MCP Server, so you can run agents against it safely.

FAQ

Questions about register_ios_device

What does the register_ios_device tool do? +

Register a new iOS device. It is categorised as a Write tool in the HC3 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 register_ios_device? +

Register the HC3 MCP Server MCP server in PolicyLayer and add a rule for register_ios_device: 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 HC3 MCP Server. Nothing to install.

What risk level is register_ios_device? +

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

Can I rate-limit register_ios_device? +

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

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

register_ios_device is provided by the HC3 MCP Server MCP server (jangabrielsson/hc3_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.