auto-why

auto-why is a skill for Claude Code, Codex from Insajin/autopus-adk. It costs 26 tokens per session (157 once invoked), scanned A, original, MIT.

A decision-tracing workflow that searches project documents such as Lore, specifications, and architecture notes. It looks for the recorded reason behind a design or implementation choice.

In plain words
What is it for?
Use it to investigate past decisions and report the supporting files and stated reasons.
Why use it?
It helps answer “why was this built this way?” without relying on memory or guessing from the code alone.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to investigate past decisions and report the supporting files and stated reasons.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/insajin/autopus-adk/auto-why
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 Insajin/autopus-adk --skill auto-why
Clone the repo
git clone --depth 1 https://github.com/Insajin/autopus-adk

Made for: Claude Code, Codex.

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 auto-why

README.md
[![agentmods](https://agentmods.dev/badge/skills/insajin/autopus-adk/auto-why/github.svg)](https://agentmods.dev/skills/insajin/autopus-adk/auto-why)
Your own site
<a href="https://agentmods.dev/skills/insajin/autopus-adk/auto-why"><img src="https://agentmods.dev/badge/skills/insajin/autopus-adk/auto-why/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 auto-why

Your own site · 80×15
<a href="https://agentmods.dev/skills/insajin/autopus-adk/auto-why"><img src="https://agentmods.dev/badge/skills/insajin/autopus-adk/auto-why.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 157 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 5.1 $0.00026 $0.00157
Opus 5 $0.00013 $0.00078
Sonnet 5 $0.00005 $0.00031
Haiku 4.5 $0.00003 $0.00016

Measured 9d ago against content hash 12ee86889648, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

auto-why 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 9d 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.

.omp/skills/auto-why/SKILL.md · 22 lines

What it actually says

auto-why

OMP Invocation

  • /auto why ...
  • /auto-why ...
  • Load detail skill auto-why for either entrypoint.

실행 계약

의사결정 근거 조회 — Lore, SPEC, ARCHITECTURE에서 이유를 추적합니다

  1. 대상 디렉터리와 전달된 인자를 확인합니다.
  2. Workspace tools로 Lore, SPEC, ARCHITECTURE를 검색해 요청된 결정의 근거를 추적합니다.
  3. 근거 파일과 결정 이유를 인용합니다.
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. 9d ago First seen · 22 lines · 26 tokens per session scan A 12ee86889648

Subscribe to this mod's changes

auto-why is a skill published in the GitHub repository Insajin/autopus-adk (111 stars, last pushed yesterday), licensed MIT. It adds 26 tokens to every session and 157 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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