Payments_UpdateCustomFields

A write tool on the ServiceTitan MCP server.

SERVERServiceTitan MCP Server SOURCEjordandalton/servicetitanmcpserver

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/jordandalton-servicetitanmcpserver/payments-updatecustomfields.md

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.

RISK

Why Payments_UpdateCustomFields is rated Medium

This tool modifies payment data through custom field updates. While the description is empty (lowering confidence slightly), the name strongly suggests a Write operation on financial payment records. It is categorized as Write rather than Financial because it appears to update metadata/custom fields on payments rather than move money or create financial obligations.

From the tool's definition Tool name 'Payments_UpdateCustomFields' indicates modification of payment-related custom fields. The 'Update' verb directly implies write/modification operations on payment data.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs Payments_UpdateCustomFields safely

PolicyLayer is an MCP gateway: it sits between your AI agents and ServiceTitan MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For Payments_UpdateCustomFields, this is the rule to start with:

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"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect ServiceTitan MCP Server, apply this rule, and every Payments_UpdateCustomFields call is checked against it from then on.

FAQ

Questions about Payments_UpdateCustomFields

What does the Payments_UpdateCustomFields tool do? +

Payments_UpdateCustomFields is a write tool on the ServiceTitan MCP Server MCP server. 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.

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