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ccc-systematic-debugging SKILL.md skillA

ccc-systematic-debugging from kevinzai/commander is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add kevinzai/commander/ccc-systematic-debugging@git:20261025.55437a6

Pins git:20261025.55437a6 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: kevinzai/commander
Path: commander/cowork-plugin/skills/ccc-systematic-debugging/SKILL.md
Versions recorded: 5
Latest version: git:20261025.55437a6, committed Oct 25, 2026
First version recorded: Jul 7, 2026
Size: 7,920 bytes
Repository stars: 6
License: MIT

Root-cause debugging: reproduce, hypothesize, then fix once with a failing test first. Use for a bug, a failing or flaky test, or an unknown error.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# /ccc-systematic-debugging — root cause before fix

**CC Commander** · /ccc-systematic-debugging · a four-phase process that finds the cause, proves it, and fixes it once.

```
NO FIX WITHOUT CONFIRMED ROOT CAUSE
```

Guess-and-check fixes waste time and create new bugs; quick patches mask the real issue. Complete each phase before starting the next.

## When to use / when not to

- Use for any bug, failing or flaky test, crash, wrong output, or error whose cause is not yet proven.
- Use even when the issue looks simple; the process is fast for simple bugs.
- Do not use for a known, already-diagnosed change (a typo the user pointed at, a requested refactor). Make that edit directly.
- For investigations expected to run past ~20 turns, span several systems, or need hypothesis state held across cycles, delegate (see "Decision points").

## What happens

Start from `$ARGUMENTS` (the symptom, error text or failing test). Keep a short hypothesis log in the conversation: hypothesis, evidence, result, per cycle.

### Phase 1 — Root-cause investigation (before any fix)

1. **Read the error completely:** full stack trace, line numbers, error codes. Do not skim.
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add kevinzai/commander/ccc-systematic-debugging@sha256:15c55ac3d1267a4b

The line at the top of this page pins the label git:20261025.55437a6, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

[![mdr](https://markdownregistry.com/badge/art_5t7zplytkctheu4z.svg)](https://markdownregistry.com/a/art_5t7zplytkctheu4z)

1 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 5 versions of this file, between Jul 7, 2026 and Oct 25, 2026, about one every 28 days.

version	committed	commit	size	audit
git:20261025.55437a6 latest	2026-10-25	55437a6	7,920 B	A	view · diff
git:20261025.7eae921	2026-10-25	7eae921	7,891 B	A	view · diff
git:20261025.3b88727	2026-10-25	3b88727	7,916 B	A	view · diff
git:20261013.fbe187d	2026-10-13	fbe187d	8,002 B	A	view · diff
git:20260707.947ab2f	2026-07-07	947ab2f	4,982 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (7920 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag

Source

GitHub

kevinzai/commander · 6 stars · license MIT · pushed 2026-11-08 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_5t7zplytkctheu4z
GET https://markdownregistry.com/api/v1/resolve?ref=kevinzai/commander/ccc-systematic-debugging
GET https://markdownregistry.com/api/v1/blob/15c55ac3d1267a4b80a815cb5b2d14d3e8d943ca1b486c57f77bdb0c88606b02

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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