home_inventory · Personal Brain MCP: Risk & Policy

WHAT IT DOES

What home_inventory does on Personal Brain

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

WHY IT NEEDS A POLICY

Why home_inventory needs a policy

The tool primarily performs Write operations (create/update) on household inventory records. The Read aspect ("View") is subordinate. While it stores sensitive information like paint codes and HVAC specifications, these are not financial, destructive, or executable in nature. The misuse risk is low—an AI agent injecting false warranty dates or appliance models causes minor inconvenience but is easily corrected.

From the tool's definition Tool description explicitly states "View, add, or update household items" — the add/update operations constitute reversible modifications to stored data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

home_inventory Rate-limited

home_inventory 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": {
    "home_inventory": {
      "limits": [
        {
          "counter": "home_inventory_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 Personal Brain, so you can run agents against it safely.

FAQ

Questions about home_inventory

What does the home_inventory tool do? +

View, add, or update household items (appliances, paint codes, HVAC filter sizes, tools, electronics). Includes warranty info. It is categorised as a Write tool in the Personal Brain MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on home_inventory? +

Register the Personal Brain MCP server in PolicyLayer and add a rule for home_inventory: 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 Personal Brain. Nothing to install.

What risk level is home_inventory? +

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

Can I rate-limit home_inventory? +

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

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

home_inventory is provided by the Personal Brain MCP server (phantomts/personal-brain-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.