update_tool · Vapi Mcp Server Enhanced MCP: Risk & Policy

WHAT IT DOES

What update_tool does on Vapi Mcp Server Enhanced

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

WHY IT NEEDS A POLICY

Why update_tool needs a policy

An AI agent can call update_tool faster than any human can review — one bad instruction and it creates or modifies resources in Vapi Mcp Server Enhanced by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_tool Rate-limited

update_tool 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": {
    "update_tool": {
      "limits": [
        {
          "counter": "update_tool_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 Vapi Mcp Server Enhanced, so you can run agents against it safely.

FAQ

Questions about update_tool

What does the update_tool tool do? +

Updates an existing Vapi tool. It is categorised as a Write tool in the Vapi Mcp Server Enhanced MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_tool? +

Register the Vapi Mcp Server Enhanced MCP server in PolicyLayer and add a rule for update_tool: 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 Vapi Mcp Server Enhanced. Nothing to install.

What risk level is update_tool? +

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

Can I rate-limit update_tool? +

Yes. Add a rate_limit block to the update_tool 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 update_tool completely? +

Set action: deny in the PolicyLayer policy for update_tool. 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 update_tool? +

update_tool is provided by the Vapi Mcp Server Enhanced MCP server (vapi-mcp-server-enhanced). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.