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skills/lenses/dead-code.md
dan fb15000877 refactor: restructure for cross-repo deployment 
- Rename reviews/ to lenses/ (clearer terminology)
- Add workflows/ for beads proto templates
- Extract code-review proto to workflows/molecules.jsonl
- Update ai-skills.nix module:
  - Add enableLenses option (deploys to ~/.config/lenses/)
  - Add enableWorkflows option (deploys to ~/.beads/molecules.jsonl)
  - Derive repoRoot from skillsPath for sibling directories
- Update lens paths in proto to use deployed location

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2025-12-26 01:18:19 -05:00

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Dead Code Review Lens

Review the provided code for unused, unreachable, or obsolete code.

What to Look For

Zombie Code

  • Commented-out code blocks (should be deleted, git has history)
  • Functions/methods that are defined but never called
  • Exported symbols that are never imported elsewhere
  • Variables assigned but never read
  • Parameters passed but never used

Unreachable Code

  • Code after unconditional return/throw/break
  • Branches that can never execute (dead conditions)
  • Error handlers for errors that can't occur
  • Feature flags that are always on/off

Obsolete Code

  • Compatibility shims for deprecated dependencies
  • Polyfills for features now universally supported
  • Migration code that has already run
  • TODO comments older than 6 months with no activity
  • Version checks for versions no longer supported

Import/Dependency Cruft

  • Imported modules that are never used
  • Dependencies in package manifest but unused in code
  • Conditional imports that never trigger

Output Format

For each finding:

[DEAD] <severity:HIGH|MED|LOW> <file:line>
Type: <zombie|unreachable|obsolete|cruft>
Issue: <what's dead>
Evidence: <how you know it's unused>
Suggest: <delete|archive|verify-then-delete>

Guidelines

  • HIGH = definitely dead, safe to delete
  • MED = likely dead, needs verification (grep for dynamic usage)
  • LOW = possibly dead, context-dependent
  • Be careful with: reflection, dynamic imports, CLI entrypoints, test fixtures
  • When uncertain, suggest verification steps rather than immediate deletion