Open-source pitch: a commerce MCP layer to gate AI purchases with limits and approvals
DangerousTotal6700 · reddit · 2026-10-21
A developer proposes an open-source, commerce-focused MCP server sitting between AI assistants and online stores (Shopify first), so models never directly control purchases. Key design points:
- Product discovery via official commerce APIs;
- User-defined spending limits and merchant restrictions;
- Explicit approval bound to the exact cart and price;
- Idempotent purchase workflows and duplicate-action prevention;
- Audit logs, receipts, and order status tracking.
The first version uses official checkout handoff rather than payment automation, leaving checkout with the merchant. The author asks the community for architecture and DX feedback: standalone MCP server vs. per-agent controls, whether idempotency/transaction recovery are real pain points, and which existing protocols or projects to study first.
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