Book Legacy Code | Agent Skills Atlas

About this skill

Working Effectively with Legacy Code techniques (characterization tests, breaking dependencies, seams) to consult when changing untested legacy code. Reference material, not a review. Use when the user asks how to safely modify legacy code or add tests around it.

Quick start

Copy the install prompt. Use the green button above this README.
Send it to your agent. Paste it into your coding agent’s chat and send.
Review the setup. Your agent checks the skill’s instructions, requirements, and installation scope.

Installation guide →

Review, license & listing details

Review the source before using this skill

This is an imported listing. We haven’t certified its safety, license, or compatibility. Skills may include executable scripts.

Automated security scan: Partial

Only SKILL.md was scanned. Supporting files and scripts were not checked. No safety grade has been assigned.

0 potential findings · Scanned 11/4/2026 · Scanner 0.2.1

Content SHA-256: 74e83f04483983d9ba80ec3b412b6e398b74624794f3c26993c2083d5344cc45

About scan coverage and limitations

Original listing metadata

Original name

book-legacy-code

Original description

About this listing

Category: General
Reported license: Apache-2.0
Listing language (estimated): English
Review status: Not individually reviewed
Agent compatibility: Atlas installation supports Claude Code, Codex, and Cursor. Skill-specific dependencies and features are checked during setup.