A walkthrough guide for explaining a technical object to a reader who has not seen it before. It first identifies the object, its version or state, the reader’s starting knowledge, and the decision the explanation should support.

Use it to prepare clear explanations of code, documents, designs, plans, or other technical objects.

It prevents explanations from describing the wrong version or assuming context the reader does not have.

walkthrough — Skill for Codex by ylxmf2005/Longrein

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 ylxmf2005/Longrein --skill walkthrough

Clone the repo

git clone --depth 1 https://github.com/ylxmf2005/Longrein

Made for: 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/ylxmf2005/longrein/walkthrough/github.svg)](https://agentmods.dev/skills/ylxmf2005/longrein/walkthrough)

Your own site

<a href="https://agentmods.dev/skills/ylxmf2005/longrein/walkthrough"><img src="https://agentmods.dev/badge/skills/ylxmf2005/longrein/walkthrough/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/ylxmf2005/longrein/walkthrough"><img src="https://agentmods.dev/badge/skills/ylxmf2005/longrein/walkthrough.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 82 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,177 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	$0.00082	$0.01177
Opus 5.5	$0.00033	$0.00471
Sonnet 5.5	$0.00016	$0.00235
Haiku 4.5	$0.00008	$0.00118

Measured 1mo ago against content hash 87c31dafefc2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

walkthrough 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/walkthrough/SKILL.md · 90 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

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.

agents/openai.yaml 253 B

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 Changed · +47 lines · -53 tokens per session 87c31dafefc2
1mo ago Changed · +12 lines · +41 tokens per session bbc95d111dcf
2mo ago First seen · 31 lines · 94 tokens per session scan A cfa53907556b

Subscribe to this mod's changes

walkthrough is a skill published in the GitHub repository ylxmf2005/Longrein (11 stars, last pushed 1mo ago), with no licence file. It adds 82 tokens to every session and 1,177 once invoked, about $0.0003 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.

Learning and teaching

walkthrough next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
walkthroughylxmf2005/Longrein	Skill	11	1mo ago	none	A	82	Codex
hr-onboardingnexu-io/open-design	Skill	106k	yesterday	Apache-2.0	A	62	Claude Code, Codex
book-mirrorgarrytan/gbrain	Skill	32k	yesterday	MIT	A	138	Claude Code
exam-forecastanthropics/claude-for-legal	Skill	9.9k	3d ago	Apache-2.0	A	73	Claude Code
lean-formalizewanshuiyin/Auto-claude-code-research-in-sleep	Skill	19k	3d ago	MIT	A	81	Claude Code
eli5companion-inc/feynman	Skill	10k	6d ago	MIT	A	63	Claude Code, Codex
deck-course-modulenexu-io/html-anything	Skill	9.4k	25d ago	Apache-2.0	A	25	Claude Code, Codex