Borrowing it
Nothing to install: this file belongs to KbWen/agentic-os. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/KbWen/agentic-os/main/.agents/skills/systematic-debugging/SKILL.mdgit clone --depth 1 https://github.com/KbWen/agentic-osWrote 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.
[](https://agentmods.dev/skills/kbwen/agentic-os/systematic-debugging)<a href="https://agentmods.dev/skills/kbwen/agentic-os/systematic-debugging"><img src="https://agentmods.dev/badge/skills/kbwen/agentic-os/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.
<a href="https://agentmods.dev/skills/kbwen/agentic-os/systematic-debugging"><img src="https://agentmods.dev/badge/skills/kbwen/agentic-os/systematic-debugging.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00039 | $0.00442 |
| Opus 5.5 | $0.00016 | $0.00177 |
| Sonnet 5.5 | $0.00008 | $0.00088 |
| Haiku 4.5 | $0.00004 | $0.00044 |
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.
Copies of this mod
1 near-identical copy found in the catalogue:
- systematic-debugging — 100% identical, 2 lines differ
What it actually says
Systematic Debugging
Overview
The core of systematic debugging is: understand first, then fix. When encountering a bug, clarify symptoms, reproduction conditions, and blast radius. Draw hypotheses, verify them with experiments to isolate the root cause, and only then submit a minimal, verifiable fix.
Ironclad Rules
- No random patching: Do not submit fixes without root cause evidence.
- Change one variable at a time: Prevent unexplainable results from touching multiple areas at once.
- Fixes MUST include evidence: Include reproduction steps, verification, and regression results.
When to Use
- Hotfix incident response.
- Flaky tests.
- Cross-module anomalies that aren't intuitively obvious.
- Any "fixed but I don't know why" risk scenarios.
Four-Phase Process
Phase 1: Observe
- Precisely record error messages, timestamps, and input conditions.
- Create a Minimal Reproducible Example (MRE).
- Mark the blast radius (affected modules/users).
Phase 2: Hypothesize
- Propose 1–3 testable root cause hypotheses.
- Design "falsifiable" checks for each hypothesis.
- Prioritize high-probability, low-cost verifiable items.
Phase 3: Verify
- Run experiments and retain output logs.
- Adjust only one variable to confirm causality.
- Remove falsified hypotheses to converge on the most likely root cause.
Phase 4: Fix
- Implement a Minimal Fix.
- Add a Regression Test.
- Verify: The original error disappears AND existing behavior is not broken.
Common Mistakes
- Modifying code before reproducing the issue.
- Modifying too many files at once, failing to locate the effective fix point.
- Treating "accidental passes" as root cause resolved.
- Lacking regression tests, causing similar issues to happen again.
What ships with it
1 file 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.
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.
- 1mo ago Changed · +11 tokens per session 9bee4d30a787
- 1mo ago First seen · 57 lines · 28 tokens per session scan A 62c160464493
systematic-debugging is a skill published in the GitHub repository KbWen/agentic-os (220 stars, last pushed yesterday), licensed MIT. It adds 39 tokens to every session and 442 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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