Stop AI coding agents from adding dependency and build ownership without a decision note.
Skill Claude CodeCodex
Use when coding, designing implementations, choosing dependencies, or reviewing whether a task should use built-ins, platform features, installed packages, open source, commercial services, or in-house code.
Skill Claude CodeCodex
Use when a non-obvious buy-vs-build decision was just made and should be recorded durably, or when a project keeps a docs/decisions/ log of Architecture Decision Records (ADRs) for build/buy/reuse and dependency choices.
Skill Claude CodeCodex
Use when auditing a repository or subsystem for avoidable in-house implementations, unnecessary dependencies, duplicated platform features, vendor lock-in, maintenance burden, or unclear buy-vs-build ownership decisions.
Skill Claude CodeCodex
Use when choosing between built-ins, standard libraries, native platform features, installed packages, open source libraries, commercial products, or in-house implementation for a feature or technical design.
Skill Claude CodeCodex
Use when evaluating whether to adopt a specific open-source or commercial dependency (npm/PyPI/etc. package or library) — to research its fit, maintenance and health, security and supply-chain risk, license, and footprint before taking it on.
Skill Claude CodeCodex
Use when summarizing Buy vs Build benchmark cases, behavior measurements, expected impact, release notes, or evidence that the ruleset reduces unnecessary code, dependencies, cost, or ownership risk.
Skill Claude CodeCodex
Use when reviewing a code diff, pull request, or local changes for buy-vs-build mistakes, avoidable custom code, unnecessary dependencies, missed built-ins, missed platform features, or weak decision notes.
Skill Claude CodeCodex
Use when choosing between options at the same ownership rung — a transport, API style, data store, job/async mechanism, integration pattern, or cache — and you want the one that fits the requirement's real shape (directionality, volume, latency, consistency, failure mode) rather than the most powerful, popular, or…