Coding agents

Happier does not replace your coding agent. It runs the one you already use — on your own machine, in your own checkout — and gives you a way to watch it, steer it, approve its work and reply to it from anywhere.

Fourteen agents are wired up today. Whichever you pick, the parts that belong to Happier work the same way: the transcript, the pending queue, permissions and approvals, session settings, notifications, and the tools an agent can call. What differs is what each agent's own CLI exposes — which models it offers, whether it can resume a session, whether it accepts images.

Those differences are real and worth checking before you commit to a workflow. They live in one generated place:

Getting an agent running

Each agent's page covers the same three things: installing its CLI, authenticating it, and the limits that will actually affect you. The shape is deliberately identical so you can move between them.

Two things are true for all of them:

• You install the agent's CLI yourself. Happier detects what is already on the machine; it does not bundle any agent. Some agents have a managed install Happier can run for you, and the capability tables say which.
• Authentication belongs to the agent. Happier reads its login state and, for some agents, can hold the credentials for you through Connected Services so you do not have to sign in separately on every machine.

Built-in agents

Anything else that speaks ACP

For a CLI that is not on that list, Happier ships a generic Custom ACP family. You define selectable ACP backends once, and they then appear as ordinary agent choices everywhere in the app — the new-session picker, session settings, the lot.

Choosing and configuring

• Model and engine selection — how Happier decides which models to offer.
• Provider authentication — the shared authentication flow.
• Profiles — reusable environment variables, secret bindings and startup defaults, shared by the app and the CLI.
• Provider integrations — third-party routers, switchers and plugins.
• Feature matrix — which user-facing features exist on which client and runtime.

Related

• Session handoff — moving a session between machines.
• Continue with another Agent — changing the agent running a session.