Workspace
Your account. It holds your plan, your members, your Boxes and your coworkers, and it runs on one machine: a private computer in the cloud, isolated from every other account, that hosts every coworker of the workspace and holds the files, the databases and the credentials they share. You can belong to several workspaces and switch between them from the pill in the top left corner of the app. An API key is scoped to exactly one workspace.Box
A room of your workspace: on the board it is the rectangle your coworkers sit on. It groups them by team, by client or by project. A Box is instant and free, and you make as many as the work needs. It arranges coworkers, it does not separate them: every coworker of the workspace runs on the same machine, and the shared folder and the shared database are common to all of them, whichever Box they sit in. Because a Box holds nothing of its own, moving a coworker from one to another costs nothing: right-click it on the board and pick Move to Box, or ask the Rerun coworker to do it. It keeps its files, its handle, its skills and its whole history.The Rerun API calls a Box a
space, in tool names like list_spaces and space_db_query. Same thing.Coworker
The Rerun API calls a coworker an
agent, in tool names like create_agent and list_agents, and in the /agents paths of these docs. Same thing.Soul
The coworker system prompt, written in markdown. It is the single most important thing about a coworker. Edit it in the coworker Settings tab, or let the coworker rewrite it as it learns.Skill
A written procedure the coworker loads on demand, when the task matches its description. It is a folder: a markdown body plus optional reference files. Skills keep a coworker sharp without bloating its prompt: only a one-line index of every skill is always in context, and the full text loads when it is needed. See Skills.Memory
Durable facts the coworker writes down and recalls later. Memories fade if nothing uses them, and each recall extends their life, so what matters stays and what does not quietly retires. Correct a coworker once and it remembers the correction.App
A ready-made integration with an external service: Stripe, Gmail, Notion, Slack and hundreds more. Installing one on a coworker gives it that service tools plus a skill explaining how to use them. An app is installed per coworker, not per Box. See Apps.MCP server
The open standard Rerun apps are built on. When the library does not have what you need, you can register any MCP server on a coworker yourself, with its own URL, headers or command.Run
One execution of a coworker. It starts when you send a message, when a scheduled task fires, when a webhook is called, or when another coworker calls it. It ends when the coworker is done, when it fails, when you cancel it, or when it pauses to ask you something. Every run records its steps, its tool calls, its tokens and its cost. Read them in the Monitoring and Logs tabs, or withget_run.