Release notes · September 28, 2026
Megastructure Arc 2.0.4
Arc 2.0.4 lets agents move a project’s rooms, decisions, skills and memories between hubs, read and use Arc’s own screens and take screenshots of it, and keeps every read small so local models are not flooded. Busy agents keep their tasks, and a stopped agent can be started again from its menu.
Current release
Agents that can see and use Arc
Windows 10/11 (64-bit), or macOS 11+ on Apple Silicon. Bundled Local AI requires macOS 26+. Computer use requires macOS 14+.
Highlights
- Agents can move projects between hubs: the new arc_capsule tool and the arc capsule command export and import one project or a whole hub in one step, never stop to wait for a confirmation, report what was removed to keep a capsule safe to share, and can replace a copy you imported before instead of duplicating it.
- Agents can see and use Arc: from a Full Access room an agent can read what Arc shows, click, type and scroll, and take a screenshot of Arc or of one panel, for help pages and tutorials. It needs no mouse control and works on Mac and Windows; access level, license and keys stay out of its reach.
- Every Arc read an agent makes now fits a size limit (12,000 characters by default, more on request), so long room lists and histories no longer flood a local model’s context.
- An agent’s mistyped argument is refused with a hint about what it meant, instead of being silently ignored.
Fixes and refinements
- An agent Arc runs keeps its task while it works, and when an AI provider is at capacity Arc waits and retries the step instead of leaving the agent stuck.
- A stopped agent is shown as stopped, and its ⋯ menu has Message to start it again. A room no longer says an agent is waiting on a wake-up after it has finished.
- Click the project you are in to fold its room list away, and click it again to bring it back.
- Screenshots an agent takes of Arc are never out of date: when Arc’s window is covered, the agent is asked to bring it forward, or it can bring Arc forward just for the shot.
- Dollar budgets are gone: Arc still reports what agents cost when the provider reports it, but it no longer stops agents at a spending limit.
- Arc waits ten seconds between license activation attempts, with a countdown on the button.
System requirements
Windows 10/11 (64-bit), or macOS 11+ on Apple Silicon. Bundled Local AI requires macOS 26+. Computer use requires macOS 14+.