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Slash Command

Karpathy Check

Pre-flight gate walking four Karpathy principles (think first, simplicity, surgical edits, goal-driven). Use before implementation.

Type
Slash Command
GitHub stars
339
License
MIT
Repo last updated
Sep 24, 2026

What Karpathy Check is

Karpathy Check is a slash command published in the athola/claude-night-market repository on GitHub, which has about 339 stars. The repository describes itself as: “23 Claude Code plugins: TDD enforcement hooks, git/PR workflows, spec-driven development, code review, project lifecycle, fix-from-error, maintenance automation, context optimization, research, and multi-LLM delegation. 186 skills, 128 commands, 54 agents.”

A slash command is a reusable prompt saved as a markdown file and run by typing its name after a slash. In Claude Code, custom commands have been merged into skills: a file in .claude/commands/ and a skill folder in .claude/skills/ both create the same kind of command, and existing command files keep working.

Karpathy Check gives you a repeatable way to run the same instructions without retyping them, optionally with arguments.

How to install Karpathy Check

Claude Code

  1. Download karpathy-check.md from the repository.
  2. Save it to ~/.claude/commands/ (all projects) or .claude/commands/ (one project). As a skill, you can instead save it as ~/.claude/skills/<name>/SKILL.md.
  3. Run it by typing / followed by its name.

Claude Cowork

  1. Turn the command into a skill: create a folder with the file saved as SKILL.md and zip it.
  2. In Customize → Skills, click +, then upload the ZIP.
  3. Run it from any task with / and the skill name.

New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.

Inside the source file

An excerpt from plugins/imbue/commands/karpathy-check.md, shared under the repository's MIT license. Read the full file on GitHub.

A four-question pre-flight gate adapted from observations on common LLM coding pitfalls. Loads the imbue:karpathy-principles skill and walks each principle as a checkable question.

Usage

# Run as an inline pre-flight before starting work
/imbue:karpathy-check

# Pass a task description to anchor the check
/imbue:karpathy-check Add rate limiting to the signup endpoint

What It Does

  1. Loads Skill(imbue:karpathy-principles).
  2. Walks the four-question battery:
  • Think Before Coding: did I list assumptions, or guess silently?
  • Simplicity First: would a senior engineer call this overcomplicated?
  • Surgical Changes: does every changed line trace to the request?
  • Goal-Driven Execution: can I prove this is done with a check, not a feeling?
  1. For each question, captures the answer and any blockers.
  2. Outputs a verdict: PASS, NEEDS CLARIFICATION, or REWORK.

Verdict Semantics

  • PASS: all four answered concretely. Begin implementation.
  • NEEDS CLARIFICATION: at least one assumption or ambiguity needs the user's input. Surface the question, do not guess.
  • REWORK: the plan as drafted will violate one or more principles. Reshape before starting.

When to Use

  • Before any non-trivial implementation
  • When converting a vague request into a verifiable plan
  • During code review, applied to your own diff
  • When a task feels "too easy" (often a sign of hidden assumptions)

When NOT to Use

  • Trivial typos and one-line fixes
  • Throwaway scripts and exploratory spikes
  • Documentation-only changes
  • Production fires where the failing test wait is too long

See modules/tradeoff-acknowledgment.md in the skill for the full boundary discussion.

Related

  • Skill(imbue:karpathy-principles) - the underlying four-principle synthesis
  • Skill(imbue:scope-guard) - worthiness scoring before the four-question gate
  • Skill(imbue:proof-of-work) - Iron Law TDD enforcement after the gate clears
  • /imbue:justify - post-implementation audit using the same principles in reverse

Before you install

  • Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
  • Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
  • Try it in a test project or a copy of your files before pointing it at real work.
  • Pin the version you tested, and review changes before updating.
  • Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.

FAQ

What is Karpathy Check?

Karpathy Check is a slash command for Claude Code and Claude Cowork from the athola/claude-night-market repository on GitHub. Pre-flight gate walking four Karpathy principles (think first, simplicity, surgical edits, goal-driven). Use before implementation.

How do I install Karpathy Check in Claude Code?

Download karpathy-check.md from the repository. Save it to ~/.claude/commands/ (all projects) or .claude/commands/ (one project). As a skill, you can instead save it as ~/.claude/skills/<name>/SKILL.md. Run it by typing / followed by its name.

Can I use Karpathy Check in Claude Cowork?

Turn the command into a skill: create a folder with the file saved as SKILL.md and zip it. In Customize → Skills, click +, then upload the ZIP. Run it from any task with / and the skill name.

Is Karpathy Check safe to install?

It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.

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Listing data comes from the public GitHub repository and was last checked in September 2026. Excerpts are © their authors and shared under MIT. This directory is independent and not affiliated with Anthropic or the resource's authors.