The concepts behind agent-native infrastructure.
Plain-language, vendor-neutral definitions first; TmpState only appears as the worked example. Quote them freely.
What is a capability URL?
A capability URL is a URL that both identifies a resource and grants access to it: anyone who possesses the URL can use the resource, with no separate login, API key, or session. The URL embeds an unguessable, high-entropy secret, so security rests on the URL being infeasible to guess and on the holder keeping it private - the same model as a private share link.
What is a temporary database?
A temporary database is a fully functional database that is provisioned in seconds and destroyed automatically after a defined lifetime (a TTL), rather than living until someone remembers to delete it. Deletion-by-default is the defining feature: the database is real - persistent across requests, reachable over the network, inspectable - but its lifecycle is bounded from the moment it is created.
What is a zero-key API?
A zero-key API is an API whose first useful request requires no pre-provisioned credential: no signup, no API key, no OAuth flow. Access control, where needed, is established by the API itself during use - typically by returning a capability (an unguessable URL or token) that the client holds from then on - rather than by a registration step that must happen before use.