# Duplicate customiser length pricing (`duplicate_customiser_length_pricing`)

Copies one length pricing of an advanced_letter or frame_fit customiser, with its shipping settings and every row and price, into a new length pricing on the same customiser. The copy is named name, or "Copy of" and the source name when name is omitted. Nothing uses the copy until a font or the settings icon_length_pricing_id point at it, so the copy changes no storefront price. On an advanced_letter customiser, to give AI Sign Designer its own prices, copy the price list AI designs pay from, then set icon_length_pricing_id to the copy with update_customiser. Through the API a frame_fit customiser holds one price list, because the pricing document holds exactly one, so its copy is refused with price_list_limit_reached; another pricing model is refused with pricing_model_mismatch. It requires the pricing:write scope and an idempotency_key, and supports dry_run.

- Source URL: https://www.signcustomiser.com/help/mcp/tools/duplicate_customiser_length_pricing/
- Markdown URL: https://www.signcustomiser.com/help/mcp/tools/duplicate_customiser_length_pricing.md
- MCP endpoint: https://mcp.signcustomiser.com
- Required scope: `pricing:write`
- Behaviour: write

## Purpose

Start a new length pricing from the prices of an existing one, for example to give AI Sign Designer designs their own prices on an advanced_letter customiser.

## Annotations

| Hint | Value |
| --- | --- |
| readOnlyHint | false |
| destructiveHint | false |
| idempotentHint | true |
| openWorldHint | false |

## Prerequisites

- An advanced_letter or frame_fit customiser id from list_customisers and a length pricing id from list_customiser_length_pricings.
- A merchant has connected this store and approved the pricing:write scope.

## Side effects

- Creates one length pricing on one customiser, a copy of the source price list.
- Clears the customiser cached storefront configuration.
- Spends one unit of the store option-write budget.
- Claims the idempotency_key for at least 24 hours.

## Arguments

| Property | Type | Required | Description |
| --- | --- | --- | --- |
| `customiser_id` | integer | yes | The customiser id, from list_customisers. |
| `length_pricing_id` | integer | yes | The id of the length pricing to copy, from list_customiser_length_pricings. |
| `name` | string | no | The name of the copy. Omit it for "Copy of" and the source name. |
| `idempotency_key` | string | unless `dry_run` is true | A client-generated key unique to this logical write, such as a UUID. Required: repeating the call with the same key and the same arguments replays the original result instead of writing twice, and the same key with different arguments is an idempotency_key_conflict. |
| `dry_run` | boolean | no | When true, the source price list, the customiser pricing model and the frame_fit limit are checked is checked and nothing is written: the result is the same verdict the apply would have reached, and a problem the apply would have raised comes back as the same tool error. Defaults to false. A dry run claims no key. |

## Result

The new length pricing with every row, in the shape get_customiser_length_pricing returns. A dry run returns the duplicate verdict instead and writes nothing.

| Property | Type | Required | Description |
| --- | --- | --- | --- |
| `request_id` | string | yes |  |
| `store` | object | yes |  |
| `store.id` | integer | yes |  |
| `store.name` | string | yes |  |
| `customiser_id` | integer | yes |  |
| `source_length_pricing_id` | integer | yes |  |
| `length_pricing` | object | no | The new length pricing with every row. Absent on a dry run. |
| `length_pricing.id` | integer | yes |  |
| `length_pricing.customiser_id` | integer | yes |  |
| `length_pricing.name` | string or null | no |  |
| `length_pricing.letter_pricing_mode` | string or null | no | One of: `every_letter_cost`, `price_by_position`. |
| `length_pricing.letter_pricing_method` | string or null | no | One of: `material_length`, `fixed_letter`. |
| `length_pricing.shipping` | object | no |  |
| `length_pricing.shipping.calculation` | string or null | no |  |
| `length_pricing.shipping.volumetric_divisor` | integer or null | no |  |
| `length_pricing.shipping.volumetric_divisor_authored` | integer or null | no |  |
| `length_pricing.shipping.volumetric_divisor_unit` | string or null | no |  |
| `length_pricing.shipping.volumetric_divisor_canonical` | number or null | no |  |
| `length_pricing.shipping.authored_units` | object | no |  |
| `length_pricing.shipping.add_weight_to_product` | boolean | no |  |
| `length_pricing.currency` | string or null | no | The ISO 4217 currency of every integer minor-unit amount on the record. |
| `length_pricing.rows_revision` | integer | no |  |
| `length_pricing.rows` | array of object | no |  |
| `length_pricing.rows[].id` | string | no |  |
| `length_pricing.rows[].base_price` | number or null | no |  |
| `length_pricing.rows[].price_per_letter` | number or null | no |  |
| `length_pricing.rows[].price_per_cm` | number or null | no |  |
| `length_pricing.rows[].price_per_in` | number or null | no |  |
| `length_pricing.rows[].price_per_sq_cm` | number or null | no |  |
| `length_pricing.rows[].price_per_sq_in` | number or null | no |  |
| `length_pricing.rows[].price_per_lb` | number or null | no |  |
| `length_pricing.rows[].max_price_multiplier` | number or null | no |  |
| `length_pricing.rows[].width_limit_cm` | number or null | no |  |
| `length_pricing.rows[].width_limit_in` | number or null | no |  |
| `length_pricing.rows[].height_limit_cm` | number or null | no |  |
| `length_pricing.rows[].height_limit_in` | number or null | no |  |
| `length_pricing.rows[].length_limit_cm` | number or null | no |  |
| `length_pricing.rows[].length_limit_in` | number or null | no |  |
| `length_pricing.rows[].fixed_length_cm` | number or null | no |  |
| `length_pricing.rows[].fixed_length_in` | number or null | no |  |
| `length_pricing.rows[].width_modifier` | number or null | no |  |
| `length_pricing.rows[].width_modifier_in` | number or null | no |  |
| `length_pricing.rows[].height_modifier` | number or null | no |  |
| `length_pricing.rows[].height_modifier_in` | number or null | no |  |
| `length_pricing.rows[].length_modifier` | number or null | no |  |
| `length_pricing.rows[].length_modifier_in` | number or null | no |  |
| `length_pricing.rows[].price_per_sq_cm_basis` | string | no | One of: `per_sq_cm`, `per_kg_volumetric`. |
| `length_pricing.rows[].price_per_letter_by_position` | array of integer | no |  |
| `length_pricing.rows[].authored_units` | object | no |  |
| `length_pricing.created_at` | string or null | no |  |
| `length_pricing.updated_at` | string or null | no |  |
| `idempotent_replay` | boolean | no | True when this call replayed a previously recorded response for the same idempotency_key instead of applying the write again. |
| `dry_run` | boolean | no | Present and true only when dry_run was requested. |
| `valid` | boolean | no | Present only on a dry run, and always true: a failing dry run returns a tool error instead. |
| `verdict` | object | no | Present only on a dry run: the duplicate verdict. |

## Error cases

| Code | Recovery |
| --- | --- |
| `idempotency_subject_changed` | The copy was later deleted. Issue a new key and re-check the resource before writing again. |
| `insufficient_scope` | The connection was approved without pricing:write. |
| `pricing_model_mismatch` | The customiser does not price by advanced_letter or frame_fit, so a length pricing would never be used. |
| `rate_limited` | The store option-write budget is spent. Wait retry_after seconds. |
| `resource_not_found` | No length pricing with that id belongs to that customiser in this store. Sheet pricing is not a length pricing. |
| `unknown_field` | Remove the field named by pointer; the duplicate takes only name. |
| `validation_failed` | The name is longer than 255 characters, or the customiser is frame_fit and already has the one price list the API allows (price_list_limit_reached). The pointer names the field. |

## Example: Copy the price list AI designs pay from

Request:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "duplicate_customiser_length_pricing",
    "arguments": {
      "customiser_id": 42,
      "length_pricing_id": 9,
      "name": "Standard (AI Sign Designer)",
      "idempotency_key": "d5e6f7a8-b9c0-4d1e-8f2a-3b4c5d6e7f80"
    }
  }
}
```

Response:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "structuredContent": {
      "request_id": "req_01jz9x2k7c8f3m5n6p7q8r9s0t",
      "store": {
        "id": 12,
        "name": "Demo Signs"
      },
      "customiser_id": 42,
      "source_length_pricing_id": 9,
      "length_pricing": {
        "id": 10,
        "customiser_id": 42,
        "name": "Standard (AI Sign Designer)",
        "letter_pricing_mode": "every_letter_cost",
        "letter_pricing_method": "material_length",
        "shipping": {
          "calculation": "physical",
          "volumetric_divisor": null,
          "add_weight_to_product": false
        },
        "currency": "USD",
        "rows": [
          {
            "base_price": 4500,
            "width_limit_cm": 120,
            "height_limit_cm": 60,
            "length_limit_cm": null,
            "price_per_sq_cm": null,
            "price_per_sq_cm_basis": "per_sq_cm",
            "fixed_length_cm": null,
            "width_modifier": null,
            "height_modifier": null,
            "length_modifier": null,
            "max_price_multiplier": null,
            "price_per_cm": 1.25,
            "price_per_letter": null,
            "price_per_letter_by_position": null
          }
        ],
        "created_at": "2026-11-14T00:00:00Z",
        "updated_at": "2026-11-14T00:00:00Z"
      },
      "idempotent_replay": false
    }
  }
}
```

## Example: A frame_fit customiser already has its price list (error)

Request:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "duplicate_customiser_length_pricing",
    "arguments": {
      "customiser_id": 43,
      "length_pricing_id": 12,
      "dry_run": true
    }
  }
}
```

Response:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "isError": true,
    "structuredContent": {
      "error": {
        "code": "validation_failed",
        "title": "Validation failed",
        "detail": "Through the API a frame-fit customiser holds one price list, because the customiser pricing document holds exactly one. Update the existing one instead.",
        "recovery": "Correct every field listed in errors, using its pointer to locate the value and allowed_values where one is given, then call the tool again.",
        "pointer": "",
        "errors": [
          {
            "pointer": "",
            "code": "price_list_limit_reached",
            "detail": "This customiser already has the one price list the API allows for its pricing model."
          }
        ]
      }
    }
  }
}
```