Apd Debug
MANDATORY before re-dispatching the builder after any APD verifier block or critical reviewer finding on Codex. Use on any bug, test failure, build failure, error, crash, regression, or unexpected behavior. Four-phase systematic debugging — root cause investigation, pattern analysis, hypothesis + controlled test, fix with TDD. Escalate after three failed hypotheses instead of piling on more guesses. Triggers on "bug", "fail", "failing", "broken", "doesn't work", "error", "crash", "regression", "verifier blocked", "reviewer rejected".
From the source SKILL.md
Do this BEFORE re-running any pipeline phase.
What this skill does
Apd Debug is a community-contributed Claude Code skill in the math-stats sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/apd-debug/ and loads when your prompt matches the skill's trigger.
Who uses this skill
The Apd Debug Claude Code skill is built for researchers, data scientists, academics, and analysts working with complex data and scientific literature. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 117,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
How to install
Free
Manual install (2 steps)
mkdir -p ~/.claude/skills/apd-debug
curl -L https://claudskills.com/skills/apd-debug/SKILL.md \
-o ~/.claude/skills/apd-debug/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/apd-debug/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/apd-debug/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\apd-debug\SKILL.md on Windows. See the full install guide for step-by-step instructions.
Telegram
📱 Install from your phone or desktop Telegram
Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →
Pro
One-click install via the desktop app
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
Pro
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
Frequently asked questions
How do I install the Apd Debug Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy
SKILL.md from the source repository to
~/.claude/skills/apd-debug/SKILL.md and restart Claude Code. Both flows are detailed at
claudskills.com/install/.
What does the Apd Debug skill do?
MANDATORY before re-dispatching the builder after any APD verifier block or critical reviewer finding on Codex. Use on any bug, test failure, build failure, error, crash, regression, or unexpected behavior. Four-phase systematic debugging — root cause investigation, pattern analysis, hypothesis + controlled test, fix with TDD. Escalate after three failed hypotheses instead of piling on more guesses. Triggers on "bug", "fail", "failing", "broken", "doesn't work", "error", "crash", "regression", "verifier blocked", "reviewer rejected".
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Apd Debug skill?
Use Apd Debug when your Claude Code task falls under the Science & Research category — specifically in the math stats area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Apd Debug" or describe the task and let Claude pick). Browse related skills at
/category/science/.
What is a Claude Code skill and how does the Apd Debug skill fit in?
A Claude Code skill is a
SKILL.md file that lives under
~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Apd Debug is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Science & Research category. Learn more at
/learn/what-is-a-claude-skill/.
Attribution & license
Cite this skill
If you reference this skill in a blog post, paper, or documentation, you can cite it as:
APA
zstevovich. (2026). Apd Debug [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/apd-debug/
BibTeX
@misc{apd-debug-2026,
author = {zstevovich},
title = {Apd Debug [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/apd-debug/}
}Embed this skill
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