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THE 201

The SDLC, in practice

How you actually drive a feature from idea to production

Eight commands, six phases, one checkpoint at each step.

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THE COMMANDS

Eight commands map to the lifecycle

/specDefine what to buildSpec before code
/planBreak it into tasksSmall, atomic tasks
/buildImplement incrementallyOne slice at a time
/testProve it worksTests are proof
/reviewReview before mergeImprove code health
/webperfAudit performanceMeasure, then optimize
/code-simplifySimplifyClarity over cleverness
/shipDeployFaster is safer
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SOLO PROJECTS

The daily loop

agent-skills Solo projects: your daily loop Install once. Drive each phase with a command. You approve at every checkpoint. /spec Write a short PRD before any code /build Thin slices, each tested + committed /test Prove it works red, green, refactor /ship Go live with a go / no-go repeat per feature Hands-off option /build auto generates the plan and implements every task in one approved pass. Still test-driven, still committed per task. skills.addy.ie npx skills add addyosmani/agent-skills

Install once. Drive each phase with a command. Repeat per feature.

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DEFINE + PLAN

Get the intent right before writing code

  • interview-me extracts what you actually want, one question at a time
  • spec-driven-development writes objectives, structure, tests, and boundaries
  • planning-and-task-breakdown turns the spec into small, ordered, verifiable tasks
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BUILD + VERIFY

Write it in slices, prove each one

  • incremental-implementation lands thin vertical slices, rollback-friendly
  • test-driven-development enforces red, green, refactor with a real test pyramid
  • Anti-rationalization tables stop "I will add tests later" before it happens
  • debugging-and-error-recovery finds the root cause instead of guessing
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REVIEW + SHIP

Gate on quality, then roll out

  • code-review-and-quality runs a five-axis review with severity labels
  • security-and-hardening applies OWASP Top 10 prevention and boundary checks
  • shipping-and-launch handles staged rollouts, monitoring, and rollback
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HANDS-OFF

Approve the plan once, let it run

$ /build auto

Generates the plan and implements every task in one approved pass. Still test-driven, still committed per task, still pauses on failures.

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Drive the whole lifecycle with a checkpoint at each phase

$ npx skills add addyosmani/agent-skills
skills.addy.ie/lifecyclegithub.com/addyosmani/agent-skills