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Modernizing existing projects

Skill VKK-00/agentic-project-lifecycle/plugins/agentic-project-lifecycle/skills/modernizing-existing-projects

Use when changing a legacy or brownfield system with unclear behavior, weak tests, old dependencies, compatibility constraints, risky data migrations, public contracts, staged replacement, or decommissioning work.From its SKILL.md

Install
npx -y skills add VKK-00/agentic-project-lifecycle --skill modernizing-existing-projects

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SKILL.md

1.8 KB, 300 tokens by cl100k_base, as published. Nobody here has run it

Modernizing Existing Projects

Modernize from executable truth toward a safer target in reversible slices. Do not begin with a clean-room rewrite proposal.

Establish current truth

  • RULE-MOD-01: Inventory runtime entry points, critical workflows, external contracts, data ownership, deployments, telemetry, incidents, and actual consumers before selecting a target architecture.
  • RULE-MOD-02: Add characterization tests or production-derived contract checks around behavior that must survive. Distinguish intended behavior from accidental behavior explicitly.

Migrate reversibly

  • RULE-MOD-03: Prefer strangler slices, adapters, and stable seams over a big-bang rewrite unless an explicit constraint makes incremental migration impossible.
  • RULE-MOD-04: Use expand-and-contract changes for schemas and public interfaces. Define compatibility windows, dual-read/write rules where needed, cutover criteria, and rollback for every slice.
  • RULE-MOD-05: Rehearse data migration and reconciliation on production-shaped data. Measure loss, duplication, ordering, latency, and recovery rather than trusting a successful command exit.
  • RULE-MOD-06: Decommission only after traffic, data, consumers, alerts, support procedures, and rollback windows prove the old path is no longer required.

Read brownfield discovery, migration patterns, and cutover and decommission.

What ships with it: 5 files

4.2 KB alongside SKILL.md

agents/

evals/

references/

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