Run one
Start the server, add a model, give it a sandbox, and hold a session. Quickstart
horsie
An open-source managed agent harness. Durable sessions, a sandbox per session, and unattended runs — on infrastructure you own, with models you already pay for.
An agent is a model plus a harness — the loop that assembles context, calls the model, decides whether a tool call is allowed, runs it, and writes down what happened. horsie is the harness. You bring the model.
Sessions that survive
An append-only record of every model call, tool call and result. Close the tab, restart the server, walk back in. Sessions & durability
A sandbox per session
Your own machine over a connection it dials out, or a container the server builds and throws away. Runtimes & vendors
Work without you
Scheduled and API-triggered runs that report back a session you can read and continue — not a log file. Routines
Your own outer harness
Skills, hooks, MCP servers, agent presets and environments, selected per session. The harness
Read the loop
The interesting part of an agent is not the model. All of it is source you can read and change. What horsie is