write-guide

A set of instructions for writing technical guides that teach one practical task through small, progressively harder examples.

In plain words
What is it for?
Use it to create step-by-step tutorials for real development tasks, including an example, several focused steps, and suggested next steps.
Why use it?
It gives a consistent way to turn feature documentation or API information into a guide that shows both the problem and the working result.

Skill for Claude CodeCodex

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/vercel/next.js/write-guide
Any agent
npx skills add vercel/next.js --skill write-guide
Clone the repo
git clone --depth 1 https://github.com/vercel/next.js

Made for: Claude Code, Codex.

Per session 102 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,288 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 $0.00102 $0.01288
Opus 5 $0.00051 $0.00644
Sonnet 5 $0.00020 $0.00258
Haiku 4.5 $0.00010 $0.00129

Measured yesterday against content hash 19a5397fd694, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

write-guide 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 yesterday.

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.

.agents/skills/write-guide/SKILL.md · 126 lines

How it starts

The opening of the file, as written. The whole thing — 126 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Writing Guides

Goal

Produce a technical guide that teaches a real-world use case through progressive examples. Concepts are introduced only when the reader needs them.

Each guide solves one specific problem. Not a category of problems. If the outline has 5+ steps or covers multiple approaches, split it.

Structure

Every guide follows this arc: introduction, example setup, 2-5 progressive steps, next steps.

Each step follows this loop: working code → new requirement → friction → explanation → resolution → observable proof.

Sections: introduction (no heading, 2 paragraphs max), ## Example (what we're building + source link), ### Step N (action-oriented titles, 2-4 steps), ## Next steps (summary + related links).

Headings should tell a story on their own. If readers only saw the headings, they'd understand the guide's takeaway.

Template

---
title: {Action-oriented, e.g., "Building X" or "How to Y"}
description: {One sentence}
nav_title: {Short title for navigation}
---

{What the reader will accomplish and why it matters. The friction and how this approach resolves it. 2 paragraphs max.}

## Example

As an example, we'll build {what we're building}.

We'll start with {step 1}, then {step 2}, and {step 3}.

{Source code link.}

### Step 1: {Action-oriented title}

{Brief context, 1-2 sentences.}

```tsx filename="path/to/file.tsx"
// Minimal working code
```

{Explain what happens.}

{Introduce friction: warning, limitation, or constraint.}

{Resolution: explain the choice, apply the fix.}

{Verify the fix with observable proof.}

### Step 2: {Action-oriented title}

{Same pattern: context → code → explain → friction → resolution → proof.}

### Step 3: {Action-oriented title}

{Same pattern.}

## Next steps

You now know how to {summary}.

Next, learn how to:

- [Related guide 1]()
- [Related guide 2]()

Workflow

  1. Research: Check available skills for relevant features. Read existing docs for context and linking opportunities.
  2. Plan: Outline sections. Verify scope (one problem, 2-4 steps). Each step needs a friction point and resolution.
  3. Write: Follow the template above. Apply the rules below.
  4. Review: Re-read the rules, verify, then present.

Read the full file on GitHub · 126 lines

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. yesterday First seen · 126 lines · 102 tokens per session scan A 19a5397fd694

Subscribe to this mod's changes

write-guide is a skill published in the GitHub repository vercel/next.js (142,020 stars, last pushed yesterday), licensed MIT. It adds 102 tokens to every session and 1,288 once invoked, about $0.0005 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.