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simplify-and-harden

Post-completion self-review for coding agents that runs simplify, harden, and micro-documentation passes on non-trivial code changes. Use when: a coding task is complete in a general agent session and you want a bounded quality and security sweep before signaling done. For CI pipeline execution, use simplify-and-harden-ci.

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ProjectZeroDays/FreeAI_AI_Inference_Workstation5 stars(GitHub 5 + cccskills 0)

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SKILL.md (original)

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Simplify & Harden

Post-completion self-review for coding agents. Runs simplify, harden, and micro-documentation passes on non-trivial code changes.

When to Use

  • After any implementation work completes, before signaling "done"
  • When the diff contains a non-trivial code change (>=10 lines in executable files, or high-impact logic change)
  • NOT for docs-only, config-only, tests-only, or generated files

Three Passes

Pass 1: Simplify

Objective: Reduce unnecessary complexity introduced during implementation.

Review checklist:

  1. Dead code — Remove debug logs, commented-out attempts, unused imports
  2. Naming clarity — Rename functions/variables that don't read well
  3. Control flow — Flatten nested conditionals, use early returns
  4. API surface — Reduce unnecessary public exposure
  5. Over-abstraction — Flag but don't restructure unless significant
  6. Consolidation — Merge egregious duplication

Cosmetic fixes applied automatically. Refactors require human approval.

Pass 2: Harden

Objective: Close security and resilience gaps.

Review checklist:

  1. Input validation — Validate all external inputs
  2. Error handling — Specific catch blocks, no swallowed exceptions
  3. Injection vectors — SQLi, XSS, command injection, path traversal
  4. Auth and authorization — Permission checks present and correct
  5. Secrets — No hardcoded credentials
  6. Data exposure — No internal state in errors/logs
  7. Dependencies — Well-maintained, properly versioned
  8. Race conditions — Proper synchronization

Security patches applied automatically. Security refactors require human approval.

Pass 3: Document

Objective: Capture non-obvious decisions.

  • Add single-line comments for logic requiring >5 seconds of "why?"
  • Add comments with context for workarounds
  • Max 5 comments per task

Budget

  • Max additional changes: 20% of original diff
  • Max execution time: 60 seconds
  • If budget exceeded, stop and report what was done

Output

Produce a structured summary:

  • Files reviewed
  • Simplify changes applied (cosmetic vs refactor)
  • Harden findings (applied vs flagged)
  • Comments added
  • Learning candidates for self-improvement

Integration

This skill pairs with:

  • verify-gate — runs before simplify-and-harden
  • self-improvement — feeds learning candidates
  • self-healing — fixes verify-gate failures

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