Simplicity Filter (Karpathy Method)
by Boubacar B
Claude defaults to complex. This skill does not let that happen. Before your session ships a 400-line solution to a 20-line problem, the simplicity filter stops it and asks: does this actually need to be this complex?
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Works with the AI tools you already use
See it in action
You say
/karpathy audit the changes I just made to the auth middleware and user controller.
Your agent does
KARPATHY AUDIT
Principle 1 - Think Before Coding: PASS Principle 2 - Simplicity First: FAIL Evidence: Added generic 'DataWrapper' class in user_controller.rb:14 Action: Remove class; use raw hash to satisfy current task Principle 3 - Surgical Changes: PASS Principle 4 - Goal-Driven Execution: PASS
VERDICT: HOLD
- Remove DataWrapper class from user_controller.rb before shipping.
What you get
About this skill
The problem
AI agents often produce bloated code, introduce premature abstractions, or refactor unrelated files during a simple bug fix. This scope creep makes PR reviews difficult and introduces hidden technical debt.
What it does
- Evaluates code against four core principles: intentionality, simplicity, surgical precision, and goal-driven verification.
- Identifies complexity hotspots like N+1 queries, O(n^2) loops, and inefficient React render patterns.
- Produces a structured PASS/FAIL/WARN scorecard for every code change or proposal.
- Enforces a strict "HOLD" verdict if any principle is failed, preventing speculative or messy code from shipping.
Why this beats prompting it yourself
Manual prompting often yields generic feedback or missing edge cases. This skill follows a rigorous audit protocol with line-level evidence and specific remediation steps that stay consistent across every session. It treats code review as a gate rather than a suggestion.
Use cases
- Reviewing a PR before submittal to ensure it only touches relevant files.
- Auditing AI-generated code to strip out "just in case" abstractions.
- Scanning for performance bottlenecks in data-heavy loops or UI components.
- Verifying that a fix actually meets the pre-defined success criteria.
Known limitations
Complexity hotspot detection is focused on patterns; it may flag false positives if performance trade-offs were made intentionally without comments.
How to install
Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.
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