transfers_update_custom_fields

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/transfers-update-custom-fields.md

WHAT IT DOES

What transfers_update_custom_fields does on ServiceTitan MCP Server

AI agents use transfers_update_custom_fields 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 transfers_update_custom_fields is rated Medium

The 'update' action modifies data reversibly, placing this in the Write category rather than Read or Destructive. In a business context like ServiceTitan (field service management), transfers typically involve moving resources, inventory, or assignments between entities. Custom field updates could have business impact depending on what fields are modified, hence 'high' severity.

From the tool's definition Tool name 'transfers_update_custom_fields' indicates an update operation on transfer-related custom fields. The 'update' verb in the name signifies modification of existing data. Description is empty, reducing specificity.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs transfers_update_custom_fields 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 transfers_update_custom_fields, this is the rule to start with:

transfers_update_custom_fields Rate-limited

transfers_update_custom_fields 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": {
    "transfers_update_custom_fields": {
      "limits": [
        {
          "counter": "transfers_update_custom_fields_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 transfers_update_custom_fields call is checked against it from then on.

FAQ

Questions about transfers_update_custom_fields

What does the transfers_update_custom_fields tool do? +

transfers_update_custom_fields 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 transfers_update_custom_fields? +

Register the ServiceTitan MCP Server MCP server in PolicyLayer and add a rule for transfers_update_custom_fields: 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 transfers_update_custom_fields? +

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

Can I rate-limit transfers_update_custom_fields? +

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

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

transfers_update_custom_fields 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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