Build on Mac with Codex
like a software engineer.
A practical field guide for turning agent output into reliable software. Set up your Mac, scope the work, protect your progress and verify what ships.
Good output starts with good boundaries.
Use Codex as an engineering collaborator with context, constraints and a testable definition of done.
Specify the outcome
Give observable requirements and preserve existing contracts.
Checkpoint deliberately
Review and preserve your work before significant changes.
Inspect before editing
Trace the real implementation before choosing a fix.
Ask for evidence
Require actual checks, reviewed diffs and honest limitations.
16 chapters. One disciplined practice.
Read in order or jump directly to the problem in front of you.
Start with a predictable Mac environment
Open chapter →
Begin at the repository boundary
Open chapter →
Give every project an AGENTS.md
Open chapter →
Give specifications, not vague requests
Open chapter →
Deliver in verified stages
Open chapter →
Inspect evidence before implementation
Open chapter →
Make Codex prove the result
Open chapter →
Use Git as a deliberate safety system
Open chapter →
Give Codex controlled autonomy
Open chapter →
Debug from a reproduction, not a guess
Open chapter →
Verify the browser experience
Open chapter →
Recover failed work without losing evidence
Open chapter →
Keep the next session reproducible
Open chapter →
Use parallel agents selectively
Open chapter →
Use specialist perspectives with evidence
Open chapter →
Establish a professional completion contract
Open chapter →
Your environment is part of the program.
Apple Silicon & Intel
Inspect architecture, package prefixes and Rosetta constraints.
zsh, CLT & Homebrew
Build a repeatable setup with a deliberate PATH.
Permissions & security
Separate executable bits, privacy access and Gatekeeper.
BSD command toolkit
Use commands that actually match the Mac in front of you.
Turn the guide into a working habit.
Task prompt builder
Write a bounded specification with a live, copyable preview.
AGENTS.md generator
Capture project commands, conventions and constraints.
Readiness & completion
Track your review and interpret local diagnostics honestly.
28 reusable prompts
Repository analysis, specialist reviews and Mac compatibility.