Agents

An agent is a harness the host serves, such as Claude, with the models it offers. A new session picks one. The host also offers slash commands and completions.

Screen

A new session asks for the agent and the model first. In a session, the palette (ctrl+p) has Choose harness and Choose model. / lists the slash commands, and @ completes a file path on the host.

Commands

Command		Flags
agents	The agents the host serves, with their models	--json
models	Every model, grouped by agent	--json
commands	The slash commands the host offers	--json
completions <uri> <text>	What the host would complete	--offset N --json

The provider name from agents is what session new --agent and exec --agent take.

MCP tools

Always served.

Tool	What it does	Arguments
list_agents core, read only	The harnesses this host serves and the models each offers. The provider name from here is what new_session takes.

Host support

Every AHP host lists its agents. Slash commands and completions depend on the host.