pets · Personal Brain MCP: Risk & Policy

WHAT IT DOES

What pets does on Personal Brain

AI agents use pets 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 pets needs a policy

The tool primarily enables creation and modification of pet and health event records (add, update, log_event). While it also includes read operations (list, get, due_events), the presence of irreversible write capabilities elevates it above Read category. It does not delete data (Destructive), execute code (Execute), or involve financial transactions (Financial).

From the tool's definition Tool supports 'add', 'update', and 'log_event' actions for pet records and health events (vaccines, vet visits, medications). These are create and modify operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pets Rate-limited

pets 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": {
    "pets": {
      "limits": [
        {
          "counter": "pets_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 pets

What does the pets tool do? +

Manage pets and their health events. Actions: list active pets, get one, add, update, log_event (vaccine/vet/meds/etc.), due_events (what. 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 pets? +

Register the Personal Brain MCP server in PolicyLayer and add a rule for pets: 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 pets? +

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

Can I rate-limit pets? +

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

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

pets 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.