diagnose-systematically

diagnose-systematically is a skill for Claude Code, Codex from Drizzy07x/Skillquiver. It costs 31 tokens per session (874 once invoked), scanned A, original, MIT.

A step-by-step method for finding the demonstrated root cause of a software failure, flaky behavior, or regression. It uses repeatable checks and records the evidence for each hypothesis.

In plain words
What is it for?
Reproducing failures, checking environment assumptions, narrowing the cause by removing variables, and documenting commands, results, and conclusions.
Why use it?
It prevents guesses from being treated as fixes and makes it clear which experiment actually explains the problem.

Skill for Claude CodeCodex

Part of the skillquiver plugin — 24 skills shipped together

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.

agentmods
npx agentmods add skills/drizzy07x/skillquiver/diagnose-systematically
Any agent
npx skills add Drizzy07x/Skillquiver --skill diagnose-systematically
Clone the repo
git clone --depth 1 https://github.com/Drizzy07x/Skillquiver

Made for: Claude Code, Codex.

Or install skillquiver, the plugin that ships this one along with the rest of its 24 skills.

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 diagnose-systematically

README.md
[![agentmods](https://agentmods.dev/badge/skills/drizzy07x/skillquiver/diagnose-systematically.svg)](https://agentmods.dev/skills/drizzy07x/skillquiver/diagnose-systematically)
Your own site
<a href="https://agentmods.dev/skills/drizzy07x/skillquiver/diagnose-systematically"><img src="https://agentmods.dev/badge/skills/drizzy07x/skillquiver/diagnose-systematically.svg" alt="Measured on agentmods" height="20"></a>
Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 874 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original 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 $0.00031 $0.00874
Opus 5 $0.00015 $0.00437
Sonnet 5 $0.00006 $0.00175
Haiku 4.5 $0.00003 $0.00087

Measured 4d ago against content hash 1206b35f6360, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

diagnose-systematically 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 4d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (find-polluter.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/diagnose-systematically/SKILL.md · 83 lines

How it starts

The opening of the file, as written. The whole thing — 83 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Diagnose Systematically

Find the cause before proposing a fix. Diagnosis does not authorize implementation.

Preserve evidence

Keep an append-only investigation log with the symptom, commands, exit codes, decisive output, hypotheses, experiments, and verdicts. Put it in a scratch directory unless the user requested a versioned artifact. If the user requests read-only work or forbids edits, report that trail through command output and the final response; do not create any file, including a scratch or temporary log.

Evidence loop

  1. State the contract. Name the involved components, their expected behavior, and the exact observed symptom. Verify environment assumptions such as build, branch, configuration, and dependency versions.
  2. Make it fail. Run the smallest unattended signal that reaches the real symptom: focused test, CLI or HTTP assertion, headless UI check, trace replay, minimal harness, or seeded stress runner. A process starting, a string existing, or a silently skipped test is not a reproduction.
  3. Minimize. Remove one input, dependency, configuration value, or step at a time. Keep a removal only when the same symptom remains. For intermittent defects, measure a reproduction rate instead of treating one pass as proof.
  4. Form falsifiable hypotheses. First compare a working example of the same pattern with the failing path. Write only credible hypotheses, each with a distinguishing prediction and falsifier.
  5. Probe one variable. Observe state at the earliest boundary where the predictions diverge. Revert probes or instrumentation that did not explain the symptom before trying the next one.
  6. Claim only what discriminates. A cause is verified only when its prediction is observed through the symptom-specific signal and plausible alternatives are ruled out. Separate verified cause, inference, and proposed behavior change in the report.

A useful signal is symptom-specific, red-capable, deterministic or measured, fast enough to repeat, and agent-runnable. If no such signal can be built, report the attempts and request the smallest missing artifact or access.

Read the full file on GitHub · 83 lines

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. 4d ago First seen · 83 lines · 31 tokens per session scan A 1206b35f6360

Subscribe to this mod's changes

diagnose-systematically is a skill published in the GitHub repository Drizzy07x/Skillquiver (2 stars, last pushed 12d ago), licensed MIT. It adds 31 tokens to every session and 874 once invoked, about $0.0002 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 2026-08-31.

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