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.
npx agentmods add skills/yimwoo/hotl-plugin/systematic-debuggingnpx skills add yimwoo/hotl-plugin --skill systematic-debugginggit clone --depth 1 https://github.com/yimwoo/hotl-pluginWhat 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 | $0.00022 | $0.00230 |
| Opus 5 | $0.00011 | $0.00115 |
| Sonnet 5 | $0.00004 | $0.00046 |
| Haiku 4.5 | $0.00002 | $0.00023 |
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 2d 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.
What it actually says
Systematic Debugging
Four Phases
Phase 1: Reproduce
- Get a minimal, reliable reproduction
- Never fix what you can't reproduce
Phase 2: Understand
- Read the error message fully — the answer is often there
- Trace the call path from symptom to root cause
- Check: recent changes, environment differences, assumptions about inputs
Phase 3: Hypothesize
- Form 1-3 specific hypotheses about root cause
- Test each hypothesis with the smallest possible change
- Never change multiple things at once
Phase 4: Fix and Verify
- Fix the root cause, not the symptom
- Run the reproduction case — confirm fixed
- Run full test suite — confirm no regressions
- Invoke
hotl:verification-before-completion
Red Flags
- "Let me try X and see what happens" without a hypothesis
- Changing multiple things before verifying
- Marking done without running full tests
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.
- 2d ago First seen · 35 lines · 22 tokens per session scan A cb5421eab794
systematic-debugging is a skill published in the GitHub repository yimwoo/hotl-plugin (26 stars, last pushed 1mo ago), licensed MIT. It adds 22 tokens to every session and 230 once invoked, about $0.0001 per session on Opus 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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