Behavior-Structure Separation 振る舞い変更と構造変更の分離・外部挙動維持 SKILL.md skillA
Behavior-Structure Separation 振る舞い変更と構造変更の分離・外部挙動維持 from s977043/river-review is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add s977043/river-review/Behavior-Structure Separation 振る舞い変更と構造変更の分離・外部挙動維持@v0.1.0Pins v0.1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- s977043/river-review
- Path
skills/midstream/behavior-structure-separation/SKILL.md- Versions recorded
- 2
- Latest version
- v0.1.0, committed Jul 19, 2026
- First version recorded
- Jul 19, 2026
- Size
- 14,862 bytes
- Repository stars
- 7
- License
- MIT
リファクタリング（構造変更）と機能変更（behavior change）が同一 diff に混在していないかを識別し、structural change に対する external behavior preservation の証拠（テスト・型・静的解析）が揃っているかを diff-time で確認する。証拠不足のときは Characterization Test 追加を促すか question とする。DTO/公開 API の破壊的変更検出は api-compatibility、完了主張の反証や抽出リファクタの性能特性退行は refactor-claim-audit、新知識の命名・責務・境界への反映は knowledge-to-code-alignment、投機的抽象化・スコープ逸脱は altitude-generalization / fix-scope-integrity へ委譲する.
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What the file says
## Origin / 由来 inspired by: - <https://agilejourney.uzabase.com/entry/2026/07/16/103000> — 構造変更（リファクタリング）と振る舞い変更を分離し、外部挙動を維持したまま設計を更新する営みとしてのリファクタリング論。Preparatory / Post-change Refactoring と Behavior Change の識別、Characterization / Safety Net の考え方。 上記は観測された考え方の紹介であり、本文の転載・著者による endorsement を含まない（nominative fair use）。命名は `skills/README.md` Naming に従い value を表す新規名として付与した。 ## Pattern declaration Primary pattern: Reviewer Secondary patterns: Inversion Why: 振る舞い/構造変更の混在と外部挙動維持の証拠評価は意味的判断が主だが、構造変更の証拠が差分に無い変更では実行を止めるゲートが必要。 ## Goal / 目的 diff に対し、次を diff-time で確認する。テストが通るだけでは分からない「仕様混在」と「安全網なしの構造変更」を検出する。 1. **分離**: 外部挙動を変える behavior change と、外部挙動を変えない structural change（リファクタリング）が同一 diff に混在していないか。混在する場合、diff・説明・コミットからそれを識別できるか。 2. **外部挙動維持の証拠**: structural change の前後で外部挙動が維持されている証拠（テスト・型・静的解析）が揃っているか。証拠が不足する場合、Characterization Test の追加を促すか `needs_review`（question）とする。 PlanGate が Behavior Change / Preparatory Refactoring / Post-change Refactoring / Characterization の区分を提供する場合はそれを入力とし、River Review は Plan を再作成せず、**diff と検証結果が Plan の変更順序・完了条件を満たすか**を確認する。 report-only。finding/question のみを出力し、自動修正・自動マージはしない。 ## Non-goals / 扱わないこと（委譲表） …
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How to install
mdr add s977043/river-review/Behavior-Structure Separation 振る舞い変更と構造変更の分離・外部挙動維持@sha256:0fbaf7aea83cece2The line at the top of this page pins the label v0.1.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_xgqi2wtkwrvawabd)
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Versions
The registry has recorded 2 versions of this file, all committed on Jul 19, 2026.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v0.1.0 latest | 2026-07-19 | 1468991 | 14,862 B | A | view · diff |
| v0.1.0 | 2026-07-19 | c55a357 | 14,088 B | A | view |
Audit of the latest version
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Source
s977043/river-review · 7 stars · license MIT · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_xgqi2wtkwrvawabd GET https://markdownregistry.com/api/v1/resolve?ref=s977043/river-review/Behavior-Structure Separation 振る舞い変更と構造変更の分離・外部挙動維持 GET https://markdownregistry.com/api/v1/blob/0fbaf7aea83cece224b5b4e7bb7aa8df13449a612163c22733d571f354116bb5
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