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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.
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SOC 職業分類に基づく
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.
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.
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 familiar default.
Use when coding, designing an implementation, choosing dependencies, adding features, reviewing diffs for custom code, evaluating whether to use built-ins, standard libraries, native platform features, installed packages, open source libraries, commercial services, or an in-house implementation.
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.
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.
| name | buy-vs-build-decision |
| description | 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. |
Make the smallest useful decision memo. The goal is clarity, not ceremony.
Use this format:
Decision: use <option/rung>.
Why: <one or two sentences on the winning tradeoff>.
Rejected: <main alternative> because <constraint>.
Revisit if: <specific trigger>.
If building in-house, name the reuse option that failed and the constraint it failed. If adding a dependency or service, name the built-in or installed option that was insufficient.