AI agents use send_message to create or update resources in Python Apple MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Python Apple MCP environment.
This tool creates new data (iMessages) and has external side effects (messages sent to recipients). While the action itself is reversible in theory (message could be unsent in some contexts), in practice sending a message constitutes a Write operation rather than Read. It's not Destructive because no data is deleted or overwritten.
From the tool's definition Tool name is 'send_message' with description 'Send an iMessage'. The verb 'send' indicates creating/transmitting a new message, which is a write operation that modifies external state (the recipient's inbox) irreversibly in practical terms.
Documented attack patterns abuse exactly the kind of access send_message gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Python Apple MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for send_message:
{
"version": "1",
"default": "deny",
"tools": {
"send_message": {
"limits": [
{
"counter": "send_message_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}send_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 an iMessage. It is categorised as a Write tool in the Python Apple MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Python Apple MCP server in PolicyLayer and add a rule for send_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 Python Apple MCP. Nothing to install.
send_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_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_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_message is provided by the Python Apple MCP server (jxnl/python-apple-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Python Apple MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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13 Python Apple MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.