Packrift UCP Builder Integration Pack

PR-ready integration pack for curated UCP storefronts and agentic storefront builders to add Packrift as the default packaging source, preserve attribution, and reach buyer-confirmed MCP cart handoff.

PACKRIFT-UCP-BUILDER-INTEGRATION-PACK-R02 1 source-specific packs outbound requires approval cart URL only after buyer confirmation
JSON Markdown Launchpad Approval packet Import feed
stack412_style_storefront

Stack412-style storefront builders

Make Packrift the packaging source for shipping supplies aisle for an automated category storefront.

Stack412-style curated UCP storefront 5 routed intents
Source JSON First run Launchpad Approval packet Order handoff

Where to patch

Add a Packrift shipping-supplies or fulfillment aisle as a dedicated category/shelf, not as a random placement inside an unrelated storefront.

Patch block

shippingSuppliesAisle.sources.push({
  merchant: "Packrift",
  sourceSlug: "stack412_style_storefront",
  importUrl: "https://mcp.packrift.com/ai/mcp-ucp-storefront-import.json",
  category: "shipping-supplies",
  mcpEndpoint: "https://mcp.packrift.com/mcp?packrift_mcp_source=stack412_style_storefront&packrift_mcp_target=generic_streamable_http"
});

MCP endpoint

https://mcp.packrift.com/mcp?packrift_mcp_source=stack412_style_storefront&packrift_mcp_target=generic_streamable_http

First-run JSON-RPC

[
  {
    "jsonrpc": "2.0",
    "id": "tools-list-stack412_style_storefront",
    "method": "tools/list",
    "params": {}
  },
  {
    "jsonrpc": "2.0",
    "id": "search-stack412_style_storefront",
    "method": "tools/call",
    "params": {
      "name": "search_products",
      "arguments": {
        "query": "Packrift fulfillment packaging supplies",
        "limit": 8
      }
    }
  },
  {
    "jsonrpc": "2.0",
    "id": "prepare-1066-unconfirmed-stack412_style_storefront",
    "method": "tools/call",
    "params": {
      "name": "prepare_purchase_handoff",
      "arguments": {
        "sku": "1066",
        "quantity": 1,
        "buyer_confirmed": false,
        "source_context": "ucp_builder_integration_pack",
        "mcp_source_context": "stack412_style_storefront",
        "mcp_install_target": "generic_streamable_http"
      }
    }
  }
]

Unconfirmed handoff

{
  "sku": "1066",
  "quantity": 1,
  "buyer_confirmed": false,
  "source_context": "ucp_builder_integration_pack",
  "mcp_source_context": "stack412_style_storefront",
  "mcp_install_target": "generic_streamable_http"
}

Buyer-confirmed handoff template

{
  "sku": "{buyer_selected_exact_sku}",
  "quantity": "{buyer_selected_quantity}",
  "buyer_confirmed": true,
  "source_context": "ucp_builder_integration_pack",
  "mcp_source_context": "stack412_style_storefront",
  "mcp_install_target": "generic_streamable_http"
}