An evidence-finding guide for explaining why a technical choice, behavior, regression, or threshold exists. It searches available sources such as version history, issue trackers, documents, chat, monitoring, error reports, and product data.

Use it for design rationale, postmortems, regression investigations, and questions about why a team chose a particular approach.

It replaces guesswork about design rationale with information gathered from the project's records and operational data. This helps explain not just what changed, but why.

why — Skill for Claude Code by danjdewhurst/dotclaude

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 danjdewhurst/dotclaude --skill why

Clone the repo

git clone --depth 1 https://github.com/danjdewhurst/dotclaude

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/danjdewhurst/dotclaude/why/github.svg)](https://agentmods.dev/skills/danjdewhurst/dotclaude/why)

Your own site

<a href="https://agentmods.dev/skills/danjdewhurst/dotclaude/why"><img src="https://agentmods.dev/badge/skills/danjdewhurst/dotclaude/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/danjdewhurst/dotclaude/why"><img src="https://agentmods.dev/badge/skills/danjdewhurst/dotclaude/why.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 89 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,140 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.

Model	Per session	Once invoked
Fable 5.1	$0.00089	$0.02140
Opus 5.5	$0.00036	$0.00856
Sonnet 5.5	$0.00018	$0.00428
Haiku 4.5	$0.00009	$0.00214

Measured 1mo ago against content hash 2e3c5dc49335, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

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 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.

skills/why/SKILL.md · 155 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

12 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.

1mo ago First seen · 155 lines · 89 tokens per session scan A 2e3c5dc49335

Subscribe to this mod's changes

why is a skill published in the GitHub repository danjdewhurst/dotclaude (6 stars, last pushed 21d ago), with no licence file. It adds 89 tokens to every session and 2,140 once invoked, about $0.0004 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 2026-09-11.

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