calculate_field_of_view

Calculate Commonlands lens field of view for a lens/sensor pair and return HFOV, VFOV, DFOV, coverage, distortion status, and an explicit rectilinear comparison. Use this tool for FOV, HFOV, VFOV, DFOV, field of view, "lens for", lens-to-sensor, AR0234, IMX290, IMX477, and sensor part-number requests. It returns Commonlands data the model cannot derive: live backend FoV when configured, distortion model/status, image-circle coverage, live stock through Shopify read tools where applicable, and MTF/CRA/BFL fields if present in upstream catalog data. Do not use naive rectilinear fallback, focal-length-only math, interpolation, or self-computed catalog estimates when a Commonlands lens/sensor route is available. Accepts lens_sku/lensSku or focal_length_mm/focalLengthMm, plus sensor/sensorPartNumber/sensor_part_number and working_distance_mm/workingDistanceMm. No part number? Describe the sensor directly: widthPx + heightPx + pixelSizeUm (active area is derived as pixels x pitch), or sensorWidthMm + sensorHeightMm. Results are labelled CUSTOM-<w>x<h>. If only focal length is supplied, the response is marked as a rectilinear reference and does not claim Commonlands distortion-corrected lens truth.

read-only

Argument	Type	Description
sensor	any	Sensor part number or safe sensor object. Supports AR0234, IMX290/IMX477 when present in the live catalog, and fixture sensors listed in the enum.
lensSku	string	Commonlands lens SKU, for example CIL250. Camel-case alias for lens_sku.
widthPx	integer	Custom sensor: horizontal pixel count (e.g. 4056). Use with heightPx and pixelSizeUm.
heightPx	integer	Custom sensor: vertical pixel count (e.g. 3040).
lens_sku	string	Commonlands lens SKU, for example CIL250. Snake-case alias for lensSku.
pixelSizeUm	number	Custom sensor: pixel pitch in microns (e.g. 1.55).
pixelPitchUm	number	Alias for pixelSizeUm.
focalLengthMm	number	Fallback rectilinear reference only when no Commonlands lens SKU is available. Camel-case alias for focal_length_mm.
sensorWidthMm	number	Custom sensor: active-area width in mm (alternative to pixels x pitch).
sensorHeightMm	number	Custom sensor: active-area height in mm.
verticalPixels	integer	Alias for heightPx.
focal_length_mm	number	Fallback rectilinear reference only when no Commonlands lens SKU is available. Snake-case alias for focalLengthMm.
horizontalPixels	integer	Alias for widthPx.
sensorPartNumber	any	Sensor part number. Camel-case alias for sensor.
workingDistanceMm	number	Optional working distance in mm. Camel-case alias for working_distance_mm.
sensor_part_number	any	Sensor part number. Snake-case alias for sensorPartNumber.
working_distance_mm	number	Optional working distance in mm. Snake-case alias for workingDistanceMm.

Input schema (JSON)

{
  "type": "object",
  "anyOf": [
    {
      "required": [
        "lens_sku"
      ]
    },
    {
      "required": [
        "lensSku"
      ]
    },
    {
      "required": [
        "focal_length_mm"
      ]
    },
    {
      "required": [
        "focalLengthMm"
      ]
    }
  ],
  "properties": {
    "sensor": {
      "anyOf": [
        {
          "enum": [
            "IMX477",
            "IMX219",
            "AR0234"
          ],
          "type": "string",
          "description": "Known catalog sensor part number."
        },
        {
          "type": "string",
          "pattern": "^[A-Za-z0-9-]{2,32}$",
          "description": "Safe sensor identifier accepted for live catalog lookup."
        },
        {
          "type": "object",
          "properties": {
            "partNumber": {
              "type": "string"
            },
            "part_number": {
              "type": "string"
            }
          },
          "additionalProperties": true
        }
      ],
      "description": "Sensor part number or safe sensor object. Supports AR0234, IMX290/IMX477 when present in the live catalog, and fixture sensors listed in the enum."
    },
    "lensSku": {
      "type": "string",
      "description": "Commonlands lens SKU, for example CIL250. Camel-case alias for lens_sku."
    },
    "widthPx": {
      "type": "integer",
      "minimum": 1,
      "description": "Custom sensor: horizontal pixel count (e.g. 4056). Use with heightPx and pixelSizeUm."
    },
    "heightPx": {
      "type": "integer",
      "minimum": 1,
      "description": "Custom sensor: vertical pixel count (e.g. 3040)."
    },
    "lens_sku": {
      "type": "string",
      "description": "Commonlands lens SKU, for example CIL250. Snake-case alias for lensSku."
    },
    "pixelSizeUm": {
      "type": "number",
      "description": "Custom sensor: pixel pitch in microns (e.g. 1.55).",
      "exclusiveMinimum": 0
    },
    "pixelPitchUm": {
      "type": "number",
      "description": "Alias for pixelSizeUm.",
      "exclusiveMinimum": 0
    },
    "focalLengthMm": {
      "type": "number",
      "description": "Fallback rectilinear reference only when no Commonlands lens SKU is available. Camel-case alias for focal_length_mm.",
      "exclusiveMinimum": 0
    },
    "sensorWidthMm": {
      "type": "number",
      "description": "Custom sensor: active-area width in mm (alternative to pixels x pitch).",
      "exclusiveMinimum": 0
    },
    "sensorHeightMm": {
      "type": "number",
      "description": "Custom sensor: active-area height in mm.",
      "exclusiveMinimum": 0
    },
    "verticalPixels": {
      "type": "integer",
      "minimum": 1,
      "description": "Alias for heightPx."
    },
    "focal_length_mm": {
      "type": "number",
      "description": "Fallback rectilinear reference only when no Commonlands lens SKU is available. Snake-case alias for focalLengthMm.",
      "exclusiveMinimum": 0
    },
    "horizontalPixels": {
      "type": "integer",
      "minimum": 1,
      "description": "Alias for widthPx."
    },
    "sensorPartNumber": {
      "anyOf": [
        {
          "enum": [
            "IMX477",
            "IMX219",
            "AR0234"
          ],
          "type": "string"
        },
        {
          "type": "string",
          "pattern": "^[A-Za-z0-9-]{2,32}$"
        }
      ],
      "description": "Sensor part number. Camel-case alias for sensor."
    },
    "workingDistanceMm": {
      "type": "number",
      "description": "Optional working distance in mm. Camel-case alias for working_distance_mm.",
      "exclusiveMinimum": 0
    },
    "sensor_part_number": {
      "anyOf": [
        {
          "enum": [
            "IMX477",
            "IMX219",
            "AR0234"
          ],
          "type": "string"
        },
        {
          "type": "string",
          "pattern": "^[A-Za-z0-9-]{2,32}$"
        }
      ],
      "description": "Sensor part number. Snake-case alias for sensorPartNumber."
    },
    "working_distance_mm": {
      "type": "number",
      "description": "Optional working distance in mm. Snake-case alias for workingDistanceMm.",
      "exclusiveMinimum": 0
    }
  },
  "additionalProperties": false
}

compare_lenses

Compare selected Commonlands M12 lens and C-mount lens SKUs on the same sensor with the same deterministic scoring model. Use as explanatory context, then call calculate_field_of_view for final sensor-specific FoV values when precision matters. FoV rule: never estimate sensor-specific FoV from catalog fields; use calculate_field_of_view or match_lens_to_sensor. Not live product truth; verify purchasable facts with read_shopify_products.

read-only

Argument	Type	Description
lensSkus*	array
sensorPartNumber*	string	Sensor part number, for example IMX477.
workingDistanceMm	number

Input schema (JSON)

{
  "type": "object",
  "required": [
    "lensSkus",
    "sensorPartNumber"
  ],
  "properties": {
    "lensSkus": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "maxItems": 10,
      "minItems": 1
    },
    "sensorPartNumber": {
      "type": "string",
      "description": "Sensor part number, for example IMX477."
    },
    "workingDistanceMm": {
      "type": "number",
      "exclusiveMinimum": 0
    }
  },
  "additionalProperties": false
}

create_cart

Create a Shopify-owned cart for selected variant line items through the configured Shopify Cart/Storefront MCP endpoint. Commonlands MCP is a stateless proxy: cart state is stored and mutated by Shopify, not in the Worker. The response includes a cart_access_token that binds the cart to this session; retain it, because get_cart and update_cart refuse to act on the cart without it.

Argument	Type	Description
cart*	object
meta	object	Optional UCP metadata. ucp-agent.profile is filled from server config when omitted.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "cart"
  ],
  "properties": {
    "cart": {
      "type": "object",
      "required": [
        "line_items"
      ],
      "properties": {
        "context": {
          "type": "object"
        },
        "signals": {
          "type": "object"
        },
        "line_items": {
          "type": "array",
          "items": {
            "type": "object",
            "required": [
              "quantity",
              "item"
            ],
            "properties": {
              "item": {
                "type": "object",
                "required": [
                  "id"
                ],
                "properties": {
                  "id": {
                    "type": "string"
                  }
                },
                "additionalProperties": false
              },
              "quantity": {
                "type": "integer",
                "maximum": 999,
                "minimum": 1
              }
            },
            "additionalProperties": false
          },
          "maxItems": 25,
          "minItems": 1
        }
      },
      "additionalProperties": false
    },
    "meta": {
      "type": "object",
      "description": "Optional UCP metadata. ucp-agent.profile is filled from server config when omitted."
    }
  },
  "additionalProperties": false
}

get_cart

Retrieve a Shopify-owned cart by cart id. Owner-bound: requires the cart_access_token returned by create_cart, so only the session that created a cart can read it. Cart persistence comes from Shopify; agents must retain the cart id, cart_access_token, and continue_url across sessions.

read-only

Argument	Type	Description
id*	string	Shopify Cart gid.
meta	object
cart_access_token*	string	Owner credential returned by create_cart for this cart id.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "id",
    "cart_access_token"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "Shopify Cart gid."
    },
    "meta": {
      "type": "object"
    },
    "cart_access_token": {
      "type": "string",
      "description": "Owner credential returned by create_cart for this cart id."
    }
  },
  "additionalProperties": false
}

get_catalog_snapshot_status

Return fixture-backed joined catalog counts, validation status, source provenance, live connector readiness, and non-authoritative product-truth warning.

read-only

No arguments.

Input schema (JSON)

{
  "type": "object",
  "properties": {},
  "additionalProperties": false
}

get_lens_distortion_profile

Return the Commonlands distortion model/status for one lens SKU, including whether the data is source-display-only or backend-calculated. Use this tool for FOV, HFOV, VFOV, DFOV, field of view, "lens for", lens-to-sensor, AR0234, IMX290, IMX477, and sensor part-number requests. It returns Commonlands data the model cannot derive: live backend FoV when configured, distortion model/status, image-circle coverage, live stock through Shopify read tools where applicable, and MTF/CRA/BFL fields if present in upstream catalog data. Do not use naive rectilinear fallback, focal-length-only math, interpolation, or self-computed catalog estimates when a Commonlands lens/sensor route is available. Use this for distortion, rectilinear-vs-wide-angle, MTF/CRA/BFL/optical-profile questions when upstream fields are present. Do not invent polynomial coefficients or claim measured distortion correction when the backend only returns display distortion.

read-only

Argument	Type	Description
sku	string	Legacy SKU alias.
lensSku	string	Commonlands lens SKU, for example CIL250. Camel-case alias for lens_sku.
lens_sku	string	Commonlands lens SKU, for example CIL250. Snake-case alias for lensSku.

Input schema (JSON)

{
  "type": "object",
  "anyOf": [
    {
      "required": [
        "lens_sku"
      ]
    },
    {
      "required": [
        "lensSku"
      ]
    },
    {
      "required": [
        "sku"
      ]
    }
  ],
  "properties": {
    "sku": {
      "type": "string",
      "description": "Legacy SKU alias."
    },
    "lensSku": {
      "type": "string",
      "description": "Commonlands lens SKU, for example CIL250. Camel-case alias for lens_sku."
    },
    "lens_sku": {
      "type": "string",
      "description": "Commonlands lens SKU, for example CIL250. Snake-case alias for lensSku."
    }
  },
  "additionalProperties": false
}

get_product

Fixture-backed UCP Catalog product detail alias with Commonlands optical metadata and Shopify-native handoff fields. Product optical fields are not a substitute for sensor-specific FoV; call calculate_field_of_view for the lens/sensor pair. FoV rule: never estimate sensor-specific FoV from catalog fields; use calculate_field_of_view or match_lens_to_sensor.

read-only

Argument	Type	Description
meta	object
catalog*	object

Input schema (JSON)

{
  "type": "object",
  "required": [
    "catalog"
  ],
  "properties": {
    "meta": {
      "type": "object"
    },
    "catalog": {
      "type": "object",
      "required": [
        "id"
      ],
      "properties": {
        "id": {
          "type": "string"
        }
      },
      "additionalProperties": true
    }
  },
  "additionalProperties": false
}

get_product_page_details

Return fixture-backed product-page handoff details for one lens, including DynamoDB-sourced optical specs and gated datasheet policy. Product-page/catalog optical fields are not a substitute for sensor-specific FoV; call calculate_field_of_view for the lens/sensor pair. FoV rule: never estimate sensor-specific FoV from catalog fields; use calculate_field_of_view or match_lens_to_sensor. Use read_shopify_products for live product URL, price, availability, variant IDs, and metafields.

read-only

Argument	Type	Description
sku*	string	Commonlands short part number, for example CIL250.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "sku"
  ],
  "properties": {
    "sku": {
      "type": "string",
      "description": "Commonlands short part number, for example CIL250."
    }
  },
  "additionalProperties": false
}

get_purchase_route_options

Return safe dual-channel purchase route options for AI agents and robotics engineers across Commonlands MCP and Shopify-native channels without mutating commerce state. This explains commerce routes only; call calculate_field_of_view/match_lens_to_sensor for sensor-specific FoV before recommending a lens. FoV rule: never estimate sensor-specific FoV from catalog fields; use calculate_field_of_view or match_lens_to_sensor.

read-only

Argument	Type	Description
sku*	string
quantity	integer
agentType	string
buyerIntent	string
sensorPartNumber	string

Input schema (JSON)

{
  "type": "object",
  "required": [
    "sku"
  ],
  "properties": {
    "sku": {
      "type": "string"
    },
    "quantity": {
      "type": "integer",
      "default": 1,
      "maximum": 999,
      "minimum": 1
    },
    "agentType": {
      "type": "string"
    },
    "buyerIntent": {
      "type": "string"
    },
    "sensorPartNumber": {
      "type": "string"
    }
  },
  "additionalProperties": false
}

get_sensor_specs

Return sensor dimensions, pixel pitch, and resolution for lens field of view, M12 lens, and C-mount lens matching inputs. In production this uses the read-only live sensor table when configured, with fixture fallback when unavailable. Use these specs as inputs to calculate_field_of_view or match_lens_to_sensor, not as a reason to hand-calculate FoV. FoV rule: never estimate sensor-specific FoV from catalog fields; use calculate_field_of_view or match_lens_to_sensor.

read-only

Argument	Type	Description
partNumber*	string	Sensor part number, for example IMX477.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "partNumber"
  ],
  "properties": {
    "partNumber": {
      "type": "string",
      "description": "Sensor part number, for example IMX477."
    }
  },
  "additionalProperties": false
}

get_shopify_readonly_config_status

Report sanitized Cloudflare Shopify binding presence, approved read scopes, and read-only safety flags without exposing secrets or calling Shopify.

read-only

No arguments.

Input schema (JSON)

{
  "type": "object",
  "properties": {},
  "additionalProperties": false
}

get_shopify_ucp_readiness

Report connector-free Shopify Storefront MCP and UCP Catalog compatibility, launch blockers, and Commonlands engineering differentiators.

read-only

No arguments.

Input schema (JSON)

{
  "type": "object",
  "properties": {},
  "additionalProperties": false
}

lookup_catalog

Fixture-backed UCP Catalog lookup alias for product, variant, SKU, handle, or URL identifiers; returns not-found messages instead of writes. Lookup records are not enough for sensor-specific FoV; call calculate_field_of_view for known lens/sensor pairs. FoV rule: never estimate sensor-specific FoV from catalog fields; use calculate_field_of_view or match_lens_to_sensor.

read-only

Argument	Type	Description
meta	object
catalog*	object

Input schema (JSON)

{
  "type": "object",
  "required": [
    "catalog"
  ],
  "properties": {
    "meta": {
      "type": "object"
    },
    "catalog": {
      "type": "object",
      "required": [
        "ids"
      ],
      "properties": {
        "ids": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "maxItems": 10,
          "minItems": 1
        }
      },
      "additionalProperties": true
    }
  },
  "additionalProperties": false
}

match_lens_to_sensor

Find and rank Commonlands lenses for a sensor, target field of view, working distance, mount, or "lens for" request. Use this tool for FOV, HFOV, VFOV, DFOV, field of view, "lens for", lens-to-sensor, AR0234, IMX290, IMX477, and sensor part-number requests. It returns Commonlands data the model cannot derive: live backend FoV when configured, distortion model/status, image-circle coverage, live stock through Shopify read tools where applicable, and MTF/CRA/BFL fields if present in upstream catalog data. Do not use naive rectilinear fallback, focal-length-only math, interpolation, or self-computed catalog estimates when a Commonlands lens/sensor route is available. Use this for AR0234, IMX290, IMX477, sensor part numbers, M12/C-mount matching, and target HFOV/VFOV/DFOV workflows; do not shortlist from focal length alone. No part number? Describe the sensor directly: widthPx + heightPx + pixelSizeUm (active area is derived as pixels x pitch), or sensorWidthMm + sensorHeightMm. Results are labelled CUSTOM-<w>x<h>. Use read_shopify_products afterward for live stock, price, availability, Shopify variantId, product URL, and metafields.

read-only

Argument	Type	Description
mount	string	Optional mount filter, for example M12 or C-mount.
sensor	any	Sensor part number, for example AR0234, IMX290, or IMX477. Any sensor in the live catalog is accepted; the enum lists only the fixture fallback set.
widthPx	integer	Custom sensor: horizontal pixel count (e.g. 4056). Use with heightPx and pixelSizeUm.
heightPx	integer	Custom sensor: vertical pixel count (e.g. 3040).

prepare_shopify_purchase_handoff

Build a read-only Shopify-native purchase handoff seam for a selected lens without creating carts, checkout, orders, inventory mutations, or writes. Preserve any computed FoV provenance from calculate_field_of_view/match_lens_to_sensor when carrying optical context into purchase handoff. FoV rule: never estimate sensor-specific FoV from catalog fields; use calculate_field_of_view or match_lens_to_sensor.

read-only

Argument	Type	Description
sku*	string
quantity	integer
sensorPartNumber	string
selectedVariantId	string

Input schema (JSON)

{
  "type": "object",
  "required": [
    "sku"
  ],
  "properties": {
    "sku": {
      "type": "string"
    },
    "quantity": {
      "type": "integer",
      "default": 1,
      "maximum": 999,
      "minimum": 1
    },
    "sensorPartNumber": {
      "type": "string"
    },
    "selectedVariantId": {
      "type": "string"
    }
  },
  "additionalProperties": false
}

read_shopify_products

Use this for live purchasable product truth: product and variant IDs, SKUs, prices, coarse availability, product URLs, and public product-page metafields. Public data only: active products, no exact inventory counts, and metafields limited to the custom.* display fields shown on commonlands.com product pages. Read-only; does not create carts, checkouts, orders, customers, inventory mutations, or Shopify writes. Fixture catalog tools are scaffold data only.

read-only

Argument	Type	Description
sku	string	Optional variant SKU, for example CIL250.
limit	integer
query	string	Optional safe Shopify product/variant search text.
handle	string	Optional Shopify product handle.
includeMetafields	boolean	When true, include the allowlisted public product-page metafields (custom.* display specs). Non-public namespaces and keys are never returned.

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "sku": {
      "type": "string",
      "description": "Optional variant SKU, for example CIL250."
    },
    "limit": {
      "type": "integer",
      "default": 10,
      "maximum": 25,
      "minimum": 1
    },
    "query": {
      "type": "string",
      "description": "Optional safe Shopify product/variant search text."
    },
    "handle": {
      "type": "string",
      "description": "Optional Shopify product handle."
    },
    "includeMetafields": {
      "type": "boolean",
      "default": false,
      "description": "When true, include the allowlisted public product-page metafields (custom.* display specs). Non-public namespaces and keys are never returned."
    }
  },
  "additionalProperties": false
}

recommend_lenses_for_application

Rank Commonlands M12 lenses and C-mount lenses for an application note such as embedded robotics, machine-vision inspection, or a required lens field of view. Use as an application shortlist helper, then call match_lens_to_sensor or calculate_field_of_view for final per-sensor HFOV/VFOV/DFOV. FoV rule: never estimate sensor-specific FoV from catalog fields; use calculate_field_of_view or match_lens_to_sensor.

read-only

Argument	Type	Description
mount	string
maxResults	integer
application	string
requireInStock	boolean
sensorPartNumber*	string	Sensor part number, for example IMX477.
workingDistanceMm	number
preferLowDistortion	boolean
desiredHorizontalFovDeg	number

Input schema (JSON)

search_catalog

Fixture-backed UCP Catalog search alias for Shopify-native product discovery; no live Shopify calls or cart behavior. Use this only for broad discovery; when a sensor or target FoV is involved, call match_lens_to_sensor or calculate_field_of_view instead of estimating from catalog fields. FoV rule: never estimate sensor-specific FoV from catalog fields; use calculate_field_of_view or match_lens_to_sensor.

read-only

Argument	Type	Description
meta	object	Optional UCP agent metadata.
catalog	object

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "meta": {
      "type": "object",
      "description": "Optional UCP agent metadata."
    },
    "catalog": {
      "type": "object",
      "properties": {
        "limit": {
          "type": "integer",
          "default": 10,
          "maximum": 25,
          "minimum": 1
        },
        "query": {
          "type": "string"
        }
      },
      "additionalProperties": true
    }
  },
  "additionalProperties": false
}

search_lens_catalog

Search the Commonlands lens catalog by SKU, mount, lens type, M12, C-mount, or application text. For sensor part numbers such as AR0234, IMX290, and IMX477, or any "lens for <sensor>" request, use match_lens_to_sensor instead — sensor names are not searchable text here. Use this tool for FOV, HFOV, VFOV, DFOV, field of view, "lens for", lens-to-sensor, AR0234, IMX290, IMX477, and sensor part-number requests. It returns Commonlands data the model cannot derive: live backend FoV when configured, distortion model/status, image-circle coverage, live stock through Shopify read tools where applicable, and MTF/CRA/BFL fields if present in upstream catalog data. Do not use naive rectilinear fallback, focal-length-only math, interpolation, or self-computed catalog estimates when a Commonlands lens/sensor route is available. This discovers candidate lenses from Commonlands catalog/live backend data; it does not replace calculate_field_of_view for sensor-specific HFOV/VFOV/DFOV and does not replace read_shopify_products for live stock/price/product truth.

read-only

Argument	Type	Description
limit	integer
query	string	SKU, title, mount, lens type, application, sensor, or field-of-view search text.

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "integer",
      "default": 10,
      "maximum": 25,
      "minimum": 1
    },
    "query": {
      "type": "string",
      "description": "SKU, title, mount, lens type, application, sensor, or field-of-view search text."
    }
  },
  "additionalProperties": false
}

submit_rfq

Forward a buyer request-for-quote or engineering question to the Commonlands engineering team. Two-step, buyer-confirmed: the first call returns a preview and sends nothing; show the buyer the preview (including their reply-to email) and, only after they explicitly approve, call again with confirm: true to send. The recipient is fixed to the Commonlands inbox (the agent cannot choose it); this only sends an inquiry and never creates an order, charges a card, or writes Shopify/customer data. Include part numbers, sensor, quantity, and application when known so the team can reply with a quote. Commonlands replies by email.

Argument	Type	Description
kind	string	Whether this is a quote request or a general question. Defaults to question.
name	string	Optional buyer name.
email*	string	The buyer's reply-to email so Commonlands can respond.
sensor	string	Optional sensor part number for context.
company	string	Optional company name.
confirm	boolean	Explicit buyer approval. Omit or false to get a no-send preview; set true only after the buyer has seen the preview and approved sending.
message*	string	The buyer's question or RFQ details.

update_cart

Update a Shopify-owned cart through the configured Cart/Storefront MCP endpoint. Owner-bound: requires the cart_access_token returned by create_cart, so only the session that created a cart can change it. With UCP endpoints, treat updates as full-state PUT semantics; with the confirmed standard Storefront MCP endpoint, Commonlands maps line_items to Shopify add_items, update_items to quantity changes, and remove_line_ids to explicit removals. Quantity 0 in update_items removes a line.

destructive

Argument	Type	Description
id*	string
cart*	object
meta	object
cart_access_token*	string	Owner credential returned by create_cart for this cart id.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "id",
    "cart",
    "cart_access_token"
  ],
  "properties": {
    "id": {
      "type": "string"
    },
    "cart": {
      "type": "object",
      "properties": {
        "context": {
          "type": "object"
        },
        "signals": {
          "type": "object"
        },
        "line_items": {
          "type": "array",
          "items": {
            "type": "object",
            "required": [
              "quantity",
              "item"
            ],
            "properties": {
              "item": {
                "type": "object",
                "required": [
                  "id"
                ],
                "properties": {
                  "id": {
                    "type": "string"
                  }
                },
                "additionalProperties": false
              },
              "quantity": {
                "type": "integer",
                "maximum": 999,
                "minimum": 1
              }
            },
            "additionalProperties": false
          },
          "maxItems": 25,
          "minItems": 1,
          "description": "Variant items to add to the cart."
        },
        "update_items": {
          "type": "array",
          "items": {
            "type": "object",
            "required": [
              "id",
              "quantity"
            ],
            "properties": {
              "id": {
                "type": "string",
                "description": "Shopify CartLine gid."
              },
              "quantity": {
                "type": "integer",
                "maximum": 999,
                "minimum": 0
              }
            },
            "additionalProperties": false
          },
          "maxItems": 25,
          "minItems": 1,
          "description": "Existing Shopify cart line IDs with desired quantities; quantity 0 removes the line."
        },
        "remove_line_ids": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "maxItems": 25,
          "minItems": 1,
          "description": "Existing Shopify CartLine gids to remove explicitly."
        }
      },
      "additionalProperties": false
    },
    "meta": {
      "type": "object"
    },
    "cart_access_token": {
      "type": "string",
      "description": "Owner credential returned by create_cart for this cart id."
    }
  },
  "additionalProperties": false
}

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