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book-legacy-change-safety

Guides safe changes to legacy or weakly tested code by characterizing behavior before editing. In strict tasks, mandatory before the first behavior-changing edit for existing-behavior bug fixes or existing code with unclear behavior, low coverage, hidden dependencies, or high regression risk; in default/lite tasks, use on demand when those risks or explicit delivery requirements are present.

packages/omp-sbtd/skills/book-legacy-change-safety/SKILL.md

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Nov 5, 2026
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# Book Legacy Change Safety

Use this Skill when the main risk is not the requested change itself, but the uncertainty around existing behavior.

It is derived from the `mini` rule style of `agent-rules-books` and is intended to complement `diagnosing-bugs`, `tdd`, source/LSP/contract impact analysis, and project validation.

## Strict Development Gate

In a strict task, run this Skill before the first behavior-changing edit when either condition is true:

- The task fixes a bug in existing observable behavior.
- Existing target code has weak / missing tests, unclear or undocumented behavior, hidden dependencies, or high regression risk.

Emit a separate visible review: