Open source · Claude Code harness

What if you could have a technical co-founder available to you 24 hours a day

Cofounder.md gives you an AI agent that works as your technical co-founder. Disciplined, risk-averse, available around the clock. You own the what and the why. It owns the how.

COFOUNDER.md
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# Your AI Co-Founder   status: online # available 24/7 role: Technical Co-Founder specialty: Full-stack engineering equity: 0%   ## What it does - Plans every feature before building it - Ships production code on demand - Explains every decision in plain English   > Ready when you are.
The old playbook is broken

Every path to shipping software costs you something brutal

Agencies drain your runway. Co-founders take half your company. No-code platforms collapse under real scale. There has never been a fourth option. Until now.

Dev agency MVP
$30,000

For a standard MVP that takes four months, misses the spec, and locks you into their retainer to maintain it.

Technical co-founder
50%

Half your company, forever, plus the co-founder conflict risk that kills more startups than competition does.

No-code platforms
The wall

Fast until it isn't. Performance ceilings, vendor lock-in, and zero ability to hire real engineers onto it later.

The workflow loop

You describe it. Your CTO plans, builds, tests, and ships it.

A repeatable four-step loop a non-technical founder runs to build an entire software product. No Git. No SQL. No terminal anxiety.

STEP 01

State the intent

Describe the outcome in plain English, exactly like you'd brief a human CTO.

> "Add a premium tier to the dashboard"
STEP 02

Approve the spec

Claude returns a blueprint with scope, implications, and a risk profile. You type one word.

> "Approved"
STEP 03

Sandboxed build

Code gets written in an isolated branch, edge cases handled, tests run automatically.

$ npm run ai:verify
STEP 04

Ship to production

Build passes, version bumps, commit drafts itself, and the feature goes live.

$ npm run ai:ship
Safety nets

Guardrails that stop the AI from destroying your product

Generic AI chat sessions end in context bloat, spaghetti code, and abandoned projects. Cofounder.md wraps every development cycle in hard execution boundaries.

External memory via progress.json

A machine-readable map of every table, API, and user flow. Claude checks it before any change so legacy features never get silently deleted.

Pre-commit lockouts

Broken code physically cannot be saved. A Git hook blocks the commit, rolls back to the last stable state, and forces a rethink.

Live API docs via MCP

Built-in Model Context Protocol links fetch current Stripe, Supabase, and Resend docs so Claude never ships deprecated patterns.

The no-jargon protocol

No raw compiler errors. No stack traces. Every technical issue gets translated into a business trade-off you can actually decide on.

The 3-bullet response

Before any complex change: scope, implications, risk profile. You always know what's about to happen before it happens.

Atomic code limits

No file exceeds 150 lines. UI never touches the database. If you hire human engineers later, they inherit a pristine codebase.

The automation layer

Four commands replace an entire DevOps education

Complex developer operations wrapped into declarative scripts that Claude executes internally. You never touch them. You just benefit from them.

$ npm run ai:plan
Parses your intent, checks project state, and outputs an implementation spec before a single line gets written.
$ npm run ai:verify
Runs compiler checks, linting, and the full test suite. Silent bugs get caught immediately, not in production.
$ npm run ai:clean
Compresses old logs and flushes expired context so the AI stays sharp and token costs stay low.
$ npm run ai:ship
Tests, versions, commits, and pushes to production. Git branches and merge conflicts become someone else's problem. The AI's.

The traditional playbook said find a co-founder, give up half, and pray. The new playbook is you, Claude Code, and one markdown file that keeps it honest.

The math

Run the numbers on your "technical co-founder"

Same enterprise-grade stack. Next.js, Tailwind, Postgres. One of these options also wants half your company.

Senior developer
$120,000
per year, plus equity expectations
  • x Months of recruiting before day one
  • x Velocity depends on mood and meetings
  • x Walks out with the codebase in their head
  • x Equity conversation is always coming
Cofounder.md + Claude
~$30
per month in API tokens
  • + Working tonight, not next quarter
  • + 100% ownership stays with you
  • + Every decision logged in progress.json
  • + Standardized codebase any human can inherit
Early access

Your co-founder is one email away

Cofounder.md is in private development. Get on the list and we'll send you the repo the moment it goes live.

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