ostack-saas

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Your tool to build an Empire using AI. One AI-agent at a time.

Built by Oussama Ammar (@daedalium) — solo capitalist and venture builder operating as a "Holding Company of One" from Dubai. Early investor in Stripe, Algolia, PayFit, Trainline. Previously co-founded The Family, a European startup accelerator whose portfolio raised $1.5B+.

Standing on the shoulders of a giant.

ostack is a fork of gstack by Garry Tan — Y Combinator President and legendary builder. Garry open-sourced gstack as an AI-powered engineering team for Claude Code, and made it free and MIT-licensed for everyone. That generosity is rare at his level, and it gave people like me a foundation that would have taken months to build from scratch. All credit for the original architecture, skills system, browser engine, and sprint philosophy goes to Garry and the gstack contributors.

ostack takes that foundation and injects a different soul — my own. Different philosophy, different mental models, different decision frameworks. Same incredible bones.

What is ostack?

ostack turns Claude Code into a virtual engineering team. Not a copilot that completes your lines — a full team that thinks, plans, reviews, tests, and ships.

You get a CEO who rethinks the product, an eng manager who locks architecture, a designer who catches AI slop, a staff engineer who finds production bugs, a QA lead who opens a real browser and clicks through your app, a security officer who runs OWASP + STRIDE audits, and a release engineer who ships the PR.

Specialist skills. All slash commands. All Markdown. All free.

Who this is for

• Solo founders — one person, institutional output. The org chart is gone.
• Technical CEOs — who still want to ship, not just manage.
• First-time Claude Code users — structured roles instead of a blank prompt.
• Staff engineers — rigorous review, QA, and release automation on every PR.

How ostack differs from gstack

ostack is not a cosmetic rebrand. It's a philosophical fork.

The core idea: AI collapses the org chart. A single operator with the right tools achieves institutional output — not because the tools replace judgment, but because they multiply it.

Quick start

# 1. Install (30 seconds)
git clone https://github.com/mr-daedalium/ostack.git ~/.claude/skills/ostack
cd ~/.claude/skills/ostack && ./setup

# 2. Try it
/office-hours          # Describe what you're building
/plan-ceo-review       # Challenge the scope
/review                # Find bugs in your branch
/qa https://your.app   # QA with a real browser
/ship                  # Ship the PR

Stop after /qa. You'll know if this is for you.

See it work

You:    I want to build a daily briefing app for my calendar.
You:    /office-hours
Claude: [asks about the pain — specific examples, not hypotheticals]

You:    Multiple Google calendars, events with stale info, wrong locations.
        Prep takes forever and the results aren't good enough...

Claude: I'm going to push back on the framing. You said "daily briefing
        app." But what you actually described is a personal chief of
        staff AI.
        [extracts 5 capabilities you didn't realize you were describing]
        [challenges 4 premises — you agree, disagree, or adjust]
        [generates 3 implementation approaches with effort estimates]
        RECOMMENDATION: Ship the narrowest wedge tomorrow, learn from
        real usage. The full vision is a 3-month project — start with
        the daily briefing that actually works.
        [writes design doc -> feeds into downstream skills automatically]

You:    /plan-ceo-review
        [reads the design doc, challenges scope, runs 10-section review]

You:    /plan-eng-review
        [ASCII diagrams for data flow, state machines, error paths]
        [test matrix, failure modes, security concerns]

You:    Approve plan. Exit plan mode.
        [writes 2,400 lines across 11 files. ~8 minutes.]

You:    /review
        [AUTO-FIXED] 2 issues. [ASK] Race condition -> you approve fix.

You:    /qa https://staging.myapp.com
        [opens real browser, clicks through flows, finds and fixes a bug]

You:    /ship
        Tests: 42 -> 51 (+9 new). PR: github.com/you/app/pull/42

You said "daily briefing app." The agent said "you're building a chief of staff AI" — because it listened to your pain, not your feature request. Eight commands, end to end. That is not a copilot. That is a team.

The sprint

ostack is a process, not a collection of tools. The skills run in the order a sprint runs:

Think -> Plan -> Build -> Review -> Test -> Ship -> Reflect

Each skill feeds into the next. /office-hours writes a design doc that /plan-ceo-review reads. /plan-eng-review writes a test plan that /qa picks up. /review catches bugs that /ship verifies are fixed. Nothing falls through the cracks because every step knows what came before it.

Your team

Power tools

Deep dives with examples for every skill ->

The effort compression table

This is why ostack exists. The ratio between human-team time and AI-assisted time:

The last 10% of completeness that teams used to skip? It costs seconds now. Do the full thing. Every time.

Install

Requirements: Claude Code or Codex, Git, Bun v1.0+, Node.js (Windows only)

Claude Code

Global install:

git clone https://github.com/mr-daedalium/ostack.git ~/.claude/skills/ostack
cd ~/.claude/skills/ostack && ./setup

Per-project install:

cp -Rf ~/.claude/skills/ostack .claude/skills/ostack
rm -rf .claude/skills/ostack/.git
cd .claude/skills/ostack && ./setup