AI agents use update_retell_llm 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 modifies configuration for a Retell LLM (a voice AI service), changing how the system responds. This is a Write operation—it changes data but is typically reversible (previous configurations could be restored).
From the tool's definition Tool name 'update_retell_llm' and description 'Update a Retell LLM response engine' indicate modification of an existing LLM configuration or state. The verb 'update' is a reversible write operation.
Documented attack patterns abuse exactly the kind of access update_retell_llm 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 update_retell_llm:
{
"version": "1",
"default": "deny",
"tools": {
"update_retell_llm": {
"limits": [
{
"counter": "update_retell_llm_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_retell_llm 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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Update a Retell LLM response engine. 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 update_retell_llm: 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.
update_retell_llm 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 update_retell_llm 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 update_retell_llm. 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.
update_retell_llm 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.