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necromancer

Trace the purpose of suspicious legacy code using current callers, tests, and Git history when deciding whether it can be changed or removed.

benchmarks/results/installer-audit-01/installer-audit-cancellation--skill--1/project/skills/necromancer/SKILL.md

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# Necromancer

> The previous developer left. Their reasons didn't.

## Follow the haunting

Read known implementation and consumer/contract files together, including enclosing logic. Discover only missing locations; search unresolved bindings before expanding scope. Text matches in examples or generated/vendor copies need a supported loading or consumer path to establish a live dependency. A narrow search cannot establish absence of other callers.

Separate two questions:

- **Needed now?** Establish a required current caller/contract or reproducible failure. A concrete break can settle a removal-only decision; preserving behavior need not preserve its mechanism. Comments alone and absent local callers cannot settle supported public contracts.
- **Why introduced?** Inspect history when requested or when an unresolved compatibility, regression or replacement decision needs it. Current necessity does not establish origin, and a commit message does not establish current necessity.

For missing attribution, use `git blame -L <start>,<end> -- <path>` and inspect that commit's relevant before/after change. Reuse established facts instead of collecting them again. Use native Git for one fact; the optional [focused history guide and collector](references/focused-history.md) covers repeated collection, renames and oversized patches. Read it only for those needs.