AI agents use send_chat_message 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 message records in a chat system, which is a reversible write operation. It does not execute arbitrary code, delete data, or move money. Severity is medium because misuse could spam users, leak sensitive information to wrong recipients, or disrupt communication, but the effects are contained to chat messaging and reversible through deletion/editing mechanisms.
From the tool's definition Tool name 'send_chat_message' and description 'Send a message to a chat' indicate creation/posting of message data to a communication system.
Documented attack patterns abuse exactly the kind of access send_chat_message 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_chat_message:
{
"version": "1",
"default": "deny",
"tools": {
"send_chat_message": {
"limits": [
{
"counter": "send_chat_message_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}send_chat_message 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 a message to a chat. 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_chat_message: 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_chat_message 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_chat_message 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_chat_message. 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_chat_message 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.