inventory_bills_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/inventory-bills-update-custom-fields.md

WHAT IT DOES

What inventory_bills_update_custom_fields does on ServiceTitan MCP Server

AI agents use inventory_bills_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 inventory_bills_update_custom_fields is rated Medium

The tool updates custom fields on inventory bills, which is a reversible data modification operation. This falls into the Write category rather than Destructive because updates are typically reversible (can be changed again). Severity is medium because incorrect updates to billing information could cause operational issues but are not inherently destructive or financial in nature.

From the tool's definition Tool name 'inventory_bills_update_custom_fields' contains 'update' which indicates modification of data. The sibling tools show patterns of read operations (get, get_list) and write operations (update, adjustments_update).

Attacks that exploit this kind of access

RECOMMENDED RULE

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

inventory_bills_update_custom_fields Rate-limited

inventory_bills_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": {
    "inventory_bills_update_custom_fields": {
      "limits": [
        {
          "counter": "inventory_bills_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 inventory_bills_update_custom_fields call is checked against it from then on.

FAQ

Questions about inventory_bills_update_custom_fields

What does the inventory_bills_update_custom_fields tool do? +

inventory_bills_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 inventory_bills_update_custom_fields? +

Register the ServiceTitan MCP Server MCP server in PolicyLayer and add a rule for inventory_bills_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 inventory_bills_update_custom_fields? +

inventory_bills_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 inventory_bills_update_custom_fields? +

Yes. Add a rate_limit block to the inventory_bills_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 inventory_bills_update_custom_fields completely? +

Set action: deny in the PolicyLayer policy for inventory_bills_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 inventory_bills_update_custom_fields? +

inventory_bills_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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