Fragua is live in private beta. It’s an AI agent orchestrator built specifically for Rails developers, and it’s the newest product under the Maquina umbrella.
Fragua is Spanish for forge — the place where raw material becomes a finished tool under heat and pressure. That’s the intent: take a project from a one-line idea to a shipped pull request, running through research, planning, spec-driven development, and execution.
Why we built it
Coding agents are good at writing code and bad at remembering why. Every new session tends to start from zero — the spec gets re-pasted, the data model gets re-explained, and the agent has no memory of a decision it helped make yesterday.
What Fragua actually sells isn’t an AI that writes code. It’s durable context and a disciplined workflow. Each phase — brief, research, plan, spec — produces a structured artifact that persists in the workspace and becomes context for the next agent. By the time the execution agent runs, it’s not guessing; it’s reading the plan, the technical guide, and the spec that already exist.
The shape of it
Foundation → Spec → Execution → Pull Request
Only Foundation (a working copy of your codebase) and an accepted Spec are required. Everything else — Product Brief, Research, MVP Plan, Brand Guide, Technical Guide — is optional enrichment that makes the execution agent sharper without ever gating it. Execution itself starts on its own: a sweep every ~2 minutes picks up accepted specs and approved issue fixes, so there’s no button for “start the build.”
Under the hood, Fragua splits the work across two planes — a web app that plans and directs, and your own machine that actually runs the agent and pushes the branch. We walk through that split, plus a live tour of the web app, in the video below.
Rails-first, not Rails-only
Every new app Fragua scaffolds is Rails 8.1 with Hotwire — Stimulus controllers, Minitest fixtures, Turbo Streams, the full set of conventions the agents already know how to read and write. That part is deliberate and non-negotiable: it’s what lets Fragua write code that looks like it belongs in your app instead of generic output.
Where you’re pointing Fragua at a codebase that already exists, the door is wider. Foundation and the Spec and Issue agents read your repo rather than dictate its stack, so brownfield projects outside Rails are something we’re genuinely open to exploring — if that’s your situation, say so in your access request and tell us what you’re working in.
What’s actually different day to day
- Durable context — nothing evaporates between sessions; later phases build on everything earlier ones produced.
- BYOK — tokens bill straight to your own Anthropic account. Fragua never proxies the call, never stores the key, can’t see your bill.
- Full observability — a live run timeline, per-turn cost broken down by phase and rolled up by workspace and month, and a durable audit trail. Metering, not gating — there are no spend caps to trip.
- Institutional memory — the Knowledge Base, every phase artifact, and the full run history live in the workspace, not in one person’s head. When someone hands off or leaves, the context stays.
- Your host, your code — agents run on your machine, against your repo, with your own git and GitHub credentials. Nothing you own leaves it.
- Claude Code today, Codex coming — the agent runtime is Claude Code right now, with Codex support coming shortly.
- Sandboxed if you want it — run the agent directly on your host, or isolate it inside Docker or a macOS Container instead. Setup is in the CLI guide.
Watch the two-plane split in action
Where things stand
Fragua is in private beta, by invitation. A human reads every request before a seat opens — there’s no schedule, seats open based on fit rather than a calendar.
| Plan | Price | Includes |
|---|---|---|
| Solo | $19/month | 1 user, unlimited workspaces, full cost dashboard, per-feature worktrees, BYOK |
| Team | $69/month, flat | 2–10 users, shared workspaces, admin & member roles, audit trail across every run, priority support, BYOK |
| Enterprise | Contact for quote | 11+ users, unlimited workspaces, on-premises deployment, dedicated support, BYOK |
All plans are free for the duration of the beta. Pricing begins 30 days after public launch, with email notice ahead of time. A read-only viewer role is on the roadmap — not shipped yet.
Need more than 10 seats, or want it on-premises? Email mario@fragua.app and we’ll work out the details directly.
If you’re building on Rails 8.x and Hotwire — solo, freelance, a small consultancy, or a growing product team — request access at fragua.app/#access. Working in something else on an existing codebase? Tell us in the request; we’d like to hear about it.
The full docs live at fragua.app, including dedicated pages on observability, teams, and trust.
Agents that respect the craft. Your host, your keys, your repo.
Fragua is built by Maquina.