With Full TEE Membership, everything below is included. On the standalone KDP plans, access splits three ways:

On every plan, including the $17 Front-End — Book Creator (writing chapters), covers, exports, KDP Listing, Marketing, Link to Book (URL/YouTube → book) and the Author's Prompt Vault. This is everything you need to write, cover, list and publish a book.
The generators, by tier — Ideas To Book unlocks on Growth ($47/mo), Low Content on Pro ($67/mo), Puzzle Books and Flipbook on Unlimited ($97/mo). Each can also be bought once and kept permanently, whichever suits you better.
One-time purchases only — the KDP Profit Blueprint, 3-Day Publishing Challenge and KDP Traffic Playbook are finished guides rather than engine tools. They are never included in a subscription at any price, and once bought they stay yours forever, even if you cancel.

The engine checks this on the server, so a locked tool stays locked until the entitlement is really on your account.

Elite KDP Engine Help