Megastructure Arc · July 11, 2026
Arc 1.1.0
Arc Desktop can now run a fully local AI agent: your own model, on your machine, working inside a single project folder — with every change reviewable and undoable.
Previous release
Local AI for your projects
Windows 10/11 (64-bit), or macOS 11+ on Apple Silicon.
Highlights
- Point Arc at a llama.cpp runtime and your own GGUF model, bind a project folder, and chat with a persistent local session — no shell access, no arbitrary network.
- Review and approve each proposed change before it touches disk; applied changes land in a durable history with per-entry Undo that survives restarts.
- Long tasks stay on the rails: a configurable step limit, a live context meter, and automatic context trimming keep work inside the model’s window.
- Plan-and-run: the local agent can draft a durable plan for a larger task and execute it step by step.
Fixes and refinements
- Small local models that repeat an identical tool call are caught and redirected instead of looping.
- Malformed tool calls now recover through a bounded protocol error instead of ending the session.
System requirements
Windows 10/11 (64-bit), or macOS 11+ on Apple Silicon.