configure_napkin_api_key

THE RISK

Medium Risk

Why configure_napkin_api_key needs a policy

API key configuration is a write operation because it creates/modifies credentials and session state. It's severity:high because misconfigured or leaked API keys can grant unauthorized access to external services and expose user data or enable fraudulent API usage. The confidence is high because the description explicitly mentions configuring an API key, which is unambiguously a credential-write operation.

From the tool's definition The tool 'configure_napkin_api_key' accepts and stores API credentials ('Configure the Napkin AI API key for this session').

Documented attack patterns abuse exactly the kind of access configure_napkin_api_key gives an agent:

POLICY

How to control configure_napkin_api_key

PolicyLayer is an MCP gateway — it sits between your AI agents and Apple Shortcuts, and nothing reaches the server without passing your rules. This is the rule we recommend for configure_napkin_api_key:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "configure_napkin_api_key": {
      "limits": [
        {
          "counter": "configure_napkin_api_key_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

configure_napkin_api_key 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.

Create a free account and register Apple Shortcuts — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Apple Shortcuts tools

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All 423 Apple Shortcuts tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about configure_napkin_api_key

What does the configure_napkin_api_key tool do? +

Configure the Napkin AI API key for this session. It is categorised as a Write tool in the Apple Shortcuts MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on configure_napkin_api_key? +

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

What risk level is configure_napkin_api_key? +

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

Can I rate-limit configure_napkin_api_key? +

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

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

configure_napkin_api_key is provided by the Apple Shortcuts MCP server (@mindstone/mcp-server-apple-shortcuts). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Apple Shortcuts tool call.

Start from Apple Shortcuts, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →