# Checklist before the first line of code

> Template from Jorel del Portal's method (joreldelportal.com/metodo-en.html).
> If any item is "no", the code can wait. The system doesn't interpret; it executes.

## Vision and domain
- [ ] The vision fits in one sentence and someone else can repeat it without reading it
- [ ] What the project is NOT is written down
- [ ] Domain entities are named and defined
- [ ] Invariants are written (what must always be true)

## Contracts
- [ ] Every module has an explicit responsibility and contract
- [ ] The data/code boundary is decided and written
- [ ] Data schemas are versioned with fail-fast validation

## Execution
- [ ] The vertical slice is defined with verifiable acceptance criteria
- [ ] The roadmap has phases with advance criteria (not decorative dates)
- [ ] Decisions taken so far have their ADR

## Delegation (people, automation, AI)
- [ ] What can be delegated, and within which limits, is written down
- [ ] What requires explicit human approval is written down
- [ ] Mandatory post-work is defined (build, validation, tests)

## Red flags (if you check any, go back up)
- [ ] "We'll define it as we go"
- [ ] "We'll adjust the schema later"
- [ ] "The AI already understands what we want"