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.