receipts_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/receipts-update-custom-fields.md

WHAT IT DOES

What receipts_update_custom_fields does on ServiceTitan MCP Server

AI agents use receipts_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 receipts_update_custom_fields is rated Medium

The 'update' verb indicates this tool modifies existing receipt custom field data reversibly. In a financial/business platform like ServiceTitan, receipts are critical transactional records. Unauthorized or erroneous updates to receipt custom fields could alter business records, audit trails, and financial reporting, justifying 'high' severity.

From the tool's definition Tool name 'receipts_update_custom_fields' contains 'update', which modifies data. Description is empty, but the naming convention and pattern match other sibling tools like 'adjustments_update' on this ServiceTitan business management platform.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

receipts_update_custom_fields Rate-limited

receipts_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": {
    "receipts_update_custom_fields": {
      "limits": [
        {
          "counter": "receipts_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 receipts_update_custom_fields call is checked against it from then on.

FAQ

Questions about receipts_update_custom_fields

What does the receipts_update_custom_fields tool do? +

receipts_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 receipts_update_custom_fields? +

Register the ServiceTitan MCP Server MCP server in PolicyLayer and add a rule for receipts_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 receipts_update_custom_fields? +

receipts_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 receipts_update_custom_fields? +

Yes. Add a rate_limit block to the receipts_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 receipts_update_custom_fields completely? +

Set action: deny in the PolicyLayer policy for receipts_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 receipts_update_custom_fields? +

receipts_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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