AI agents use send_mixmax_email to create or update resources in Apple Shortcuts — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Apple Shortcuts environment.
This tool creates new data (an email message) and has side effects (notification to recipient, email storage), but the action is reversible through standard email deletion/recall mechanisms. It does not execute arbitrary code, delete data, or move financial instruments.
From the tool's definition Tool description states it will 'Send an email via Mixmax' - a clear write operation that creates/sends a new message. The tool modifies external state by adding an email to a recipient's inbox.
Documented attack patterns abuse exactly the kind of access send_mixmax_email gives an agent:
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 send_mixmax_email:
{
"version": "1",
"default": "deny",
"tools": {
"send_mixmax_email": {
"limits": [
{
"counter": "send_mixmax_email_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}send_mixmax_email 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.
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Send an email via Mixmax through the user. 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.
Register the Apple Shortcuts MCP server in PolicyLayer and add a rule for send_mixmax_email: 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.
send_mixmax_email is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the send_mixmax_email 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.
Set action: deny in the PolicyLayer policy for send_mixmax_email. 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.
send_mixmax_email 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.
Start from Apple Shortcuts, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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423 Apple Shortcuts tools catalogued and risk-classified — across an index of 43,000+ MCP servers.