addressbook_add · HashPilot MCP: Risk & Policy

WHAT IT DOES

What addressbook_add does on HashPilot

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

WHY IT NEEDS A POLICY

Why addressbook_add needs a policy

This tool creates (writes) a new addressbook entry by adding an account reference. It is reversible (addressbook entries can be removed via addressbook_remove), so it does not qualify as Destructive. It does not execute arbitrary code, move funds, or retrieve data without side effects.

From the tool's definition Tool description states 'Add an existing Hedera account to the address book' — this creates a new addressbook entry, which is a reversible data creation operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

addressbook_add Rate-limited

addressbook_add 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": {
    "addressbook_add": {
      "limits": [
        {
          "counter": "addressbook_add_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 HashPilot, so you can run agents against it safely.

FAQ

Questions about addressbook_add

What does the addressbook_add tool do? +

Add an existing Hedera account to the address book without storing private key. Useful for accounts you want to reference but not manage. It is categorised as a Write tool in the HashPilot MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on addressbook_add? +

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

What risk level is addressbook_add? +

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

Can I rate-limit addressbook_add? +

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

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

addressbook_add is provided by the HashPilot MCP server (justmert/hashpilot). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.