Create a new Retell LLM response engine with prompt and model settings. WHEN TO USE: - Creating a new agent that needs its own prompt/model config - Separating a new call workflow from an existing agent
AI agents use create_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 creates a new LLM agent/engine in an external service (Retell), which is a write operation that modifies state in the system. The blast radius is elevated because an improperly configured LLM engine could be used for malicious prompt injection, impersonation, or unauthorized call handling workflows.
From the tool's definition Tool performs 'Create a new Retell LLM response engine' with 'prompt and model settings' configuration. The action is definitively creating/provisioning a new resource (not querying), but reversible via deletion or reconfiguration.
Documented attack patterns abuse exactly the kind of access create_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 create_retell_llm:
{
"version": "1",
"default": "deny",
"tools": {
"create_retell_llm": {
"limits": [
{
"counter": "create_retell_llm_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_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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Create a new Retell LLM response engine with prompt and model settings. WHEN TO USE: - Creating a new agent that needs its own prompt/model config - Separating a new call workflow from an existing agent. 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 create_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.
create_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 create_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 create_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.
create_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.
Free to start. No card required.
423 Apple Shortcuts tools catalogued and risk-classified — across an index of 43,000+ MCP servers.