Payments_UpdateCustomFields · ServiceTitan MCP Server MCP

WHAT IT DOES

What Payments_UpdateCustomFields does on ServiceTitan MCP Server

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

WHY IT NEEDS A POLICY

Why Payments_UpdateCustomFields needs a policy

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

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

Payments_UpdateCustomFields Rate-limited

Payments_UpdateCustomFields 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": {
    "Payments_UpdateCustomFields": {
      "limits": [
        {
          "counter": "payments_updatecustomfields_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about Payments_UpdateCustomFields

What does the Payments_UpdateCustomFields tool do? +

Payments_UpdateCustomFields. It is categorised as a Write tool in the ServiceTitan 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 Payments_UpdateCustomFields? +

Register the ServiceTitan MCP Server MCP server in PolicyLayer and add a rule for Payments_UpdateCustomFields: 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 ServiceTitan MCP Server. Nothing to install.

What risk level is Payments_UpdateCustomFields? +

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

Can I rate-limit Payments_UpdateCustomFields? +

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

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

Payments_UpdateCustomFields is provided by the ServiceTitan MCP Server MCP server (jordandalton/servicetitanmcpserver). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.