retell_create_llm · Retell AI MCP Server MCP: Risk & Policy

WHAT IT DOES

What retell_create_llm does on Retell AI MCP Server

AI agents use retell_create_llm 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_llm needs a policy

Creating a new LLM configuration is a reversible write operation that establishes new data in the system. While it could potentially affect agent behavior depending on how the configuration is used downstream, the tool itself performs a straightforward create action without executing code, triggering calls, or deleting data.

From the tool's definition Tool name includes 'create' and description states 'Create a new Retell LLM configuration with custom prompts and settings.' This is a create operation that modifies system state by adding new LLM configurations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

retell_create_llm Rate-limited

retell_create_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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "retell_create_llm": {
      "limits": [
        {
          "counter": "retell_create_llm_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_llm

What does the retell_create_llm tool do? +

Create a new Retell LLM configuration with custom prompts and 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_llm? +

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

What risk level is retell_create_llm? +

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

Can I rate-limit retell_create_llm? +

Yes. Add a rate_limit block to the retell_create_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.

How do I block retell_create_llm completely? +

Set action: deny in the PolicyLayer policy for retell_create_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.

What MCP server provides retell_create_llm? +

retell_create_llm 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.