ARCUSYour repo writes the code. You hold the gate.

ARCUS (Any Repository Can Use Spec-driven development) turns a written requirements into a tested, reviewed pull request. You approve the big moments; it sweats the rest. For simpler ones, it lets you sleep if you like ;)

Cut-the-chase

Lets-take-it-Slow

Tell-me-Everything

How-the-Magic-Happens

What's Inside

Meet-the-Team

Spec-driven-development (SDD)

Provides orchestration of Spec → Code → Pull Request flow through human-gated SDLC phases (Brainstorming, Test Planning, Implementation, Code Review, Closure).

Context Engineering - the Edge !

Scans your repository to build the context snapshot (one-time) to make it "AI Ready" and also helps refresh and keep the context always in sync with the evolving code during each SDD cycle.

Three Modes (pick your pace)

One `arcus-controller` orchestrator, three modes. Use `arcus ` to start — it runs the pipeline in the mode you configure. See [modes](/concepts/modes) for the full comparison (gated with optional phase gates, intelligent for cloud CI, afk for hands-off).

Multi-tool (Copilot CLI / Claude Code / VS Code / OpenCode)

One plugin format serves GitHub Copilot CLI, Claude Code, VS Code, and OpenCode from the same marketplace. Install once, use everywhere.

Install

Inside any Claude Code or Copilot CLI session:

/plugin marketplace add piyushbhargava1412/arcus-plugin
/plugin install arcus-plugin@arcus

For OpenCode, use the one-command global installer — see the README for details.