list_custom_field_definitions

List the agency's custom-field schema for locations or clients — the extra fields an agency has defined beyond the built-in profile fields (e.g. "Franchise ID", "Contract renewal date"). Use this before get_custom_field_values or set_custom_field_value to discover what keys/types exist. Each definition has an id, an immutable key (used with set_custom_field_value), a label, a type (text/number/date/single_select/multi_select), whether it's required, its select options (for select types), and its display order. Archived definitions are excluded. You don't pass an agency — it comes from your credentials.

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "list_custom_field_definitions",
    "arguments": {
      "entityType": "location"
    }
  }
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "content": [
      {
        "type": "text",
        "text": "..."
      }
    ]
  }
}