append_contact_note · Apple Contacts MCP: Risk & Policy

WHAT IT DOES

What append_contact_note does on Apple Contacts MCP

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

WHY IT NEEDS A POLICY

Why append_contact_note needs a policy

This tool modifies existing contact data by appending text to a note field. It is a reversible write operation (the note can be edited again), not a destructive deletion. The dry-run and confirmation requirements indicate the authors treat it as a write action. Severity is medium because misuse could pollute contact records with spurious entries, but it does not delete data or have financial implications.

From the tool's definition Append a dated interaction log entry to a contact note. Dry-run by default; actual writes require dryRun=false and confirm=true.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

append_contact_note Rate-limited

append_contact_note 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": {
    "append_contact_note": {
      "limits": [
        {
          "counter": "append_contact_note_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 Apple Contacts MCP, so you can run agents against it safely.

FAQ

Questions about append_contact_note

What does the append_contact_note tool do? +

Append a dated interaction log entry to a contact note. Dry-run by default; actual writes require dryRun=false and confirm=true. It is categorised as a Write tool in the Apple Contacts MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on append_contact_note? +

Register the Apple Contacts MCP server in PolicyLayer and add a rule for append_contact_note: 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 Apple Contacts MCP. Nothing to install.

What risk level is append_contact_note? +

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

Can I rate-limit append_contact_note? +

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

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

append_contact_note is provided by the Apple Contacts MCP server (lu-wo/apple-contacts-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.