domains / families / software-engineering / working-effectively-with-legacy-code

working-effectively-with-legacy-code

separate

Apply Michael Feathers-inspired legacy-code rules when changing hard-to-test code safely with characterization tests, seams, sprout methods, or wrap methods.

When to use

risky legacy changes
missing tests
characterization tests
seams
dependency breaking
sprout method
wrap method
incremental risk reduction

Skill page

Source

Repository	Path
ciembor/agent-rules-books	`working-effectively-with-legacy-code/SKILL.md`