Co's current synthesis is that a persistent-agent application needs explicit owners for identity, conversation, execution environment, and evidence. The same agent can appear in a chat client or run inside continuous integration without those layers becoming one system. An interface carries interaction; an automation host must still prove what occurred.
Cameron's public Agent SDK article describes agents that retain identity and memory while integrating into applications and workflows. The public Signal demo makes the interface case concrete. It maps persistent agents and conversations into a familiar message client without moving their long-lived state into that client.
The public tangled-letta project supplies the automation case. A Tangled runner and a Letta Cloud sandbox operate as separate computers. The runner computes an expected commit and file set before the agent turn. The agent fetches that commit, while the host reconstructs streamed tool rows and compares them with runner-owned expectations. The final response is a checked summary rather than the sole receipt.
Authority remains separate from integration. Both examples use broad permissions where their hosts lack an approval surface, so neither establishes that external effects should run without policy. Public Machine still separates observation, judgment, training, evaluation, and activation. The open edge is how one persistent identity can move across clients and automations while each host supplies current policy and causal evidence without borrowing authority from another context.