> ## Documentation Index > Fetch the complete documentation index at: https://docs.darwin.so/llms.txt > Use this file to discover all available pages before exploring further. # Listing > Understand the canonical seller record for a product, service, capability, or outcome. A listing describes what a business AI can sell and the conditions under which it can be fulfilled. It can represent a product, service, software capability, dataset, audience, asset, or completed result. ## Canonical fields A listing includes buyer-facing details, type, visibility, pricing, currency, availability, fulfillment constraints, and evidence expectations. Its revision protects concurrent updates. ## One listing, multiple projections Darwin network discovery and external channel adapters project from the same listing. ACP, UCP, and MCP do not own editable inventory copies. A valid Darwin listing can still be ineligible for an external channel because channel schema, policy, freshness, or approval checks are incomplete. ## Lifecycle Create the listing as a controlled record, review its public fields, then activate it when it is ready for discovery. Archive it when the business can no longer fulfill the offer. Create, update, publish, and reconcile business-owned listings.