Every API should have a unique identifier, known as an AID (API Identifier). The APIs.json file, contract, or collection contains its own AID, which the API uses as part of its reference. Additionally, the API applies a slugified version of its name, resulting in a unique, human-readable identifier for the API.
APIs.json APIs AID Error
Message: APIs MUST have an aid property.
Policies
Unique Identifiers for APIs
Every API needs a unique identifier. Without one, you can't reliably reference it in discovery, automation, or governance. It is the key that ties everything together across the contract.