design-legacy-seams

Get legacy code under test before changing it — find seams, write characterization tests. Use when changing untested code, breaking dependencies, or taming legacy.

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Repository: laurigates/claude-plugins
Letzte Quellaktivität: 23. Juni 2026 um 11:21
Erkannte Sprache von SKILL.md: Englisch
Sterne: 49
Forks: 7

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npx skills add https://github.com/laurigates/claude-plugins --skill design-legacy-seams

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SKILL.md

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name	design-legacy-seams
description	Get legacy code under test before changing it — find seams, write characterization tests. Use when changing untested code, breaking dependencies, or taming legacy.
args	[target]
argument-hint	file\|class\|function\|diff to bring under test; omit for current change
allowed-tools	Read, Grep, Glob, Bash(git diff ), Bash(git log ), TodoWrite
created	"2026-06-23T00:00:00.000Z"
modified	"2026-06-23T00:00:00.000Z"
reviewed	"2026-06-23T00:00:00.000Z"

name	design-legacy-seams
description	Get legacy code under test before changing it — find seams, write characterization tests. Use when changing untested code, breaking dependencies, or taming legacy.
args	[target]
argument-hint	file\|class\|function\|diff to bring under test; omit for current change
allowed-tools	Read, Grep, Glob, Bash(git diff ), Bash(git log ), TodoWrite
created	"2026-06-23T00:00:00.000Z"
modified	"2026-06-23T00:00:00.000Z"
reviewed	"2026-06-23T00:00:00.000Z"

Use this skill when...	Use something else instead when...
About to modify untested code and want a safety net first	The code already has good tests → `code-quality-plugin:code-review`
A dependency (DB, clock, network, global) blocks unit testing	Judging test quality of existing tests → `code-quality-plugin:code-test-quality`
Pinning current behaviour before a risky refactor	A large multi-phase refactor → `workflow-orchestration-plugin:workflow-checkpoint-refactor`
Breaking a hidden dependency to inject a fake	Diagnosing a live bug → `code-quality-plugin:debugging-methodology`

Seam type	Where you alter behaviour	Typical use
Object seam	Override a method / inject a collaborator	Replace a real dependency with a fake (most common)
Link seam	Swap a library/module at build/link time	Stub a third-party at the boundary
Preprocessing seam	Macro/build substitution before compile	Last resort in C/C++-style builds

Mistake	Correct approach
Refactoring untested code "carefully" by hand	Get it under test first — careful is not a safety net
Writing tests for what the code should do	Characterize what it does; behaviour change comes after
A giant rewrite to make one method testable	Smallest seam-opening edit (Extract & Override / Parameterize)
"Fixing" a surprising behaviour mid-characterization	Flag it; change behaviour as a separate, deliberate step

design-legacy-seams

Installationsoptionen

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Design: Legacy Code Seams

Design: Legacy Code Seams

When to Use This Skill

Core Principle

Parameters

Execution

Step 1: Find the change point and its dependencies

Step 2: Find or create a seam

Step 3: Write characterization tests

Step 4: Now change, then report

Anti-patterns

Quick Reference

Related

Blocker	Seam move
Collaborator constructed inside	Parameterize Constructor
Hard call buried in a method	Extract & Override
Global / singleton / clock	Inject via an object seam
Untouchable third-party	Link seam / Adapter at the boundary
Need to pin behaviour	Characterization test asserting current output

design-legacy-seams

Quellinformationen

Installationsoptionen

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Mehr aus diesem Repository

Mehr aus diesem Repository

Design: Legacy Code Seams

Design: Legacy Code Seams

When to Use This Skill

Core Principle

Parameters

Execution

Step 1: Find the change point and its dependencies

Step 2: Find or create a seam

Step 3: Write characterization tests

Step 4: Now change, then report

Anti-patterns

Quick Reference

Related