retell_create_agent · Retell AI MCP Server MCP

WHAT IT DOES

What retell_create_agent does on Retell AI MCP Server

AI agents use retell_create_agent to create or update resources in Retell AI MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Retell AI MCP Server environment.

WHY IT NEEDS A POLICY

Why retell_create_agent needs a policy

This tool creates a new resource (a voice agent) in the Retell AI platform. It is a reversible write operation — the agent can be deleted later. Misuse could lead to unauthorized agent deployments, but it does not directly execute code, delete data, or move money. Severity is medium because a malicious agent configuration could be used to interact with users or make calls.

From the tool's definition Create a new voice agent with specified configuration including voice, LLM engine, and behavior settings.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

retell_create_agent Rate-limited

retell_create_agent 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "retell_create_agent": {
      "limits": [
        {
          "counter": "retell_create_agent_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Retell AI MCP Server, so you can run agents against it safely.

FAQ

Questions about retell_create_agent

What does the retell_create_agent tool do? +

Create a new voice agent with specified configuration including voice, LLM engine, and behavior settings. It is categorised as a Write tool in the Retell AI MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on retell_create_agent? +

Register the Retell AI MCP Server MCP server in PolicyLayer and add a rule for retell_create_agent: 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 Retell AI MCP Server. Nothing to install.

What risk level is retell_create_agent? +

retell_create_agent is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit retell_create_agent? +

Yes. Add a rate_limit block to the retell_create_agent 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.

How do I block retell_create_agent completely? +

Set action: deny in the PolicyLayer policy for retell_create_agent. 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.

What MCP server provides retell_create_agent? +

retell_create_agent is provided by the Retell AI MCP Server MCP server (itsanamune/retellsimp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.