Skills for Real Engineers. Straight from my .agents directory.
39 skills
working-effectively-with-legacy-code
Agent skill from
Apply Michael Feathers-inspired legacy-code rules when changing hard-to-test code safely with characterization tests, seams, sprout methods, or wrap methods.
How to install working-effectively-with-legacy-code
install working-effectively-with-legacy-code
# install the agent-rules-books pack with the skills CLI
npx skills add ciembor/agent-rules-books# or add only this skill to Claude Code: copy the folder
working-effectively-with-legacy-code/
# into
~/.claude/skills/working-effectively-with-legacy-code/ (all projects)
.claude/skills/working-effectively-with-legacy-code/ (one project)
1# Working Effectively with Legacy Code Skill23Use this skill when a task involves risky legacy changes, missing tests, characterization tests, seams, dependency breaking, sprout method, wrap method, or incremental risk reduction.45Before making design or code decisions, read and apply [working-effectively-with-legacy-code.mini.md](working-effectively-with-legacy-code.mini.md). Use [working-effectively-with-legacy-code.md](working-effectively-with-legacy-code.md) only as a deeper reference when the mini rules are not enough for the current legacy-code tradeoff.
Excerpt shown under the repository's MIT license.
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