# transfers_update_custom_fields

A write tool on the ServiceTitan MCP Server MCP server.

Agent View of the PolicyLayer registry record for `transfers_update_custom_fields`. HTML page: https://policylayer.com/tools/jordandalton-servicetitanmcpserver/transfers-update-custom-fields

## Facts

- Tool: `transfers_update_custom_fields`
- Server: ServiceTitan MCP Server (`jordandalton/servicetitanmcpserver`) — https://policylayer.com/tools/jordandalton-servicetitanmcpserver.md
- Homepage: https://github.com/JordanDalton/ServiceTitanMcpServer
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "transfers_update_custom_fields",
    "arguments": {}
  }
}
```

## 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 own 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."

## Use case

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.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches ServiceTitan MCP Server:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "transfers_update_custom_fields": {
      "limits": [
        {
          "counter": "transfers_update_custom_fields_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on ServiceTitan MCP Server (453)

- `appointments_delete` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/appointments-delete.md
- `appointments_remove_hold` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/appointments-remove-hold.md
- `bulk_tags_remove_tags` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/bulk-tags-remove-tags.md
- `categories_delete` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/categories-delete.md
- `contact_methods_DeleteContactMethod` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/contact-methods-deletecontactmethod.md
- `contacts_deletecontact` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/contacts-deletecontact.md
- `contacts_deletecontactrelationship` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/contacts-deletecontactrelationship.md
- `customers_delete_contact` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/customers-delete-contact.md
- `customers_delete_note` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/customers-delete-note.md
- `customers_delete_tag` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/customers-delete-tag.md
- `DiscountAndFees_Delete` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/discountandfees-delete.md
- `equipment_delete` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/equipment-delete.md
- `estimates_delete_item` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/estimates-delete-item.md
- `gross_pay_items_delete` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/gross-pay-items-delete.md
- `invoices_delete_invoice_item` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/invoices-delete-invoice-item.md
- `jobs_cancel` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/jobs-cancel.md
- `jobs_remove_cancellation` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/jobs-remove-cancellation.md
- `locations_delete_contact` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/locations-delete-contact.md
- `locations_delete_note` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/locations-delete-note.md
- `locations_delete_tag` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/locations-delete-tag.md
- `materials_delete` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/materials-delete.md
- `non_job_appointments_delete` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/non-job-appointments-delete.md
- `purchase_orders_cancel` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/purchase-orders-cancel.md
- `purchase_orders_markup_delete` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/purchase-orders-markup-delete.md
- `receipts_cancelreceipts` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/receipts-cancelreceipts.md
- `returns_cancel` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/returns-cancel.md
- `services_delete` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/services-delete.md
- `suppressions_remove` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/suppressions-remove.md
- `team_delete` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/team-delete.md
- `technician_shifts_bulk_delete` — Destructive — https://policylayer.com/tools/jordandalton-servicetitanmcpserver/technician-shifts-bulk-delete.md
- …and 423 more: https://policylayer.com/tools/jordandalton-servicetitanmcpserver.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=jordandalton-servicetitanmcpserver · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/jordandalton-servicetitanmcpserver