systematic-debugging

systematic-debugging is a skill for Claude Code from ed3dai/ed3d-plugins. It costs 44 tokens per session (2,253 once invoked), scanned A, original, no licence file.

A four-phase method for investigating bugs, failed tests, and unexpected behavior. It moves from finding the root cause to studying patterns, testing explanations, and then changing the code.

In plain words
What is it for?
Use it to investigate software bugs, test failures, and behavior that differs from what you expected.
Why use it?
It helps avoid guessing at fixes before understanding the problem. This reduces the risk of masking the original issue or creating new ones.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter.

Part of the ed3d-plan-and-execute plugin — 14 skills, 5 commands, 4 agents shipped together

Good fit Use it to investigate software bugs, test failures, and behavior that differs from what you expected.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ed3dai/ed3d-plugins/systematic-debugging
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add ed3dai/ed3d-plugins --skill systematic-debugging
Clone the repo
git clone --depth 1 https://github.com/ed3dai/ed3d-plugins

Made for: Claude Code.

Or install ed3d-plan-and-execute, the plugin that ships this one along with the rest of its 14 skills, 5 commands, 4 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for systematic-debugging

README.md
[![agentmods](https://agentmods.dev/badge/skills/ed3dai/ed3d-plugins/systematic-debugging/github.svg)](https://agentmods.dev/skills/ed3dai/ed3d-plugins/systematic-debugging)
Your own site
<a href="https://agentmods.dev/skills/ed3dai/ed3d-plugins/systematic-debugging"><img src="https://agentmods.dev/badge/skills/ed3dai/ed3d-plugins/systematic-debugging/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for systematic-debugging

Your own site · 80×15
<a href="https://agentmods.dev/skills/ed3dai/ed3d-plugins/systematic-debugging"><img src="https://agentmods.dev/badge/skills/ed3dai/ed3d-plugins/systematic-debugging.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,253 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00044 $0.02253
Opus 5.5 $0.00018 $0.00901
Sonnet 5.5 $0.00009 $0.00451
Haiku 4.5 $0.00004 $0.00225

Measured 1mo ago against content hash f69f833515df, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

systematic-debugging scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/ed3d-plan-and-execute/skills/systematic-debugging/SKILL.md · 291 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 291 lines · 44 tokens per session scan A f69f833515df

Subscribe to this mod's changes

systematic-debugging is a skill published in the GitHub repository ed3dai/ed3d-plugins (252 stars, last pushed 1mo ago), with no licence file. It adds 44 tokens to every session and 2,253 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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debug

Interactive debugging workflow with hypothesis-driven probe loop. Use when: unknown bugs, script errors, silent failures, troubleshooting. Not for: known bugs (use bug-fix), GitHub issue analysis (use issue-analyze), code understanding (use code-explore). Output: debug report with probe journal + root cause + fix.

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code-explore

Pure Claude code investigation. Use when: tracing execution paths, understanding architecture, diagnosing issues. Not for: dual-perspective review (use code-investigate), code review (use codex-code-review). Output: analysis report with findings.

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code-investigate

Dual-perspective code investigation. Use when: deep code analysis needing both Claude and Codex perspectives. Not for: quick exploration (use code-explore), code review (use codex-code-review). Output: integrated findings from dual analysis.

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git-investigate

Git history investigation. Use when: tracking code changes, finding where bugs were introduced, root cause analysis. Not for: code exploration (use code-explore), issue analysis (use issue-analyze). Output: history trace + root cause report.

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