add mock Shopify adapter + MCP server (Python)

[bahmad503]

Summary

I added a new Shopify adapter sample (mock) in Python that exposes a UCP-like shopping API, plus an MCP server that lets agent clients (e.g., Claude Desktop) interact with the adapter as tools.

This is a mock implementation (in-memory + mock catalog) so contributors can validate the end-to-end flow without Shopify credentials.

What’s included

UCP-like REST adapter (mock)

Path: adapters/shopify/python/

• Discovery profile: GET /.well-known/ucp
• Catalog:
  • GET /products
  • GET /products/{id}
• Checkout sessions:
  • POST /checkout-sessions
  • GET /checkout-sessions/{id}
  • PUT /checkout-sessions/{id} (shipping destination + option selection)
  • POST /checkout-sessions/{id}/complete (mock payment token)
• Orders:
  • GET /orders/{id}
• Testing:
  • POST /testing/simulate-shipping/{id} (requires Simulation-Secret)

Extras:

• Basic idempotency-key handling:
  • same key + same payload ⇒ returns the original response
  • same key + different payload ⇒ 409 IDEMPOTENCY_CONFLICT

MCP server

Path: adapters/shopify/python/mcp/

• Exposes adapter functionality as tools:
  • discovery_profile, list_products, get_product
  • create_checkout, set_shipping, complete_checkout
  • get_order, simulate_shipping
• Designed to target the running adapter via ADAPTER_BASE_URL (default: http://127.0.0.1:8183).

How to run (quick start)

1) Run the adapter

cd adapters/shopify/python
python -m venv .venv
source .venv/bin/activate
pip install -e .
ucp-shopify-adapter

2) Run the MCP server (separate terminal)
cd adapters/shopify/python/mcp
python -m venv .venv
source .venv/bin/activate
pip install -e .
ADAPTER_BASE_URL=http://127.0.0.1:8183 ucp-shopify-adapter-mcp

[bahmad503]

Hi maintainers I’d appreciate feedback on (1) whether the adapter should live under adapters/ or another directory, and (2) whether the exposed MCP tools match what you’d want as a canonical “agent shopping” interface. The implementation is mock/in-memory by design so anyone can run it without Shopify tokens.