Create a browser-based voice call session. Returns a web_call_link the user can open to talk to a Retell agent. WHEN TO USE: - User wants a voice call in their browser instead of their phone - Phone call route is blocked (e.g. phone number binding issue) - Testing or demoing an agent without usin...
AI agents invoke create_web_call to trigger actions in Apple Shortcuts. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This tool initiates an external voice call session with a Retell agent, triggering an external operation (creating a live call session). It is not merely reading or writing data — it spins up an active communication session, which constitutes executing an external operation.
From the tool's definition Create a browser-based voice call session. Returns a web_call_link the user can open to talk to a Retell agent.
Documented attack patterns abuse exactly the kind of access create_web_call 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_web_call:
{
"version": "1",
"default": "deny",
"tools": {
"create_web_call": {
"limits": [
{
"counter": "create_web_call_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}create_web_call stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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Create a browser-based voice call session. Returns a web_call_link the user can open to talk to a Retell agent. WHEN TO USE: - User wants a voice call in their browser instead of their phone - Phone call route is blocked (e.g. phone number binding issue) - Testing or demoing an agent without using phone minutes EXAMPLE: {. It is categorised as a Execute tool in the Apple Shortcuts MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Apple Shortcuts MCP server in PolicyLayer and add a rule for create_web_call: 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_web_call is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the create_web_call 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_web_call. 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_web_call 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.