hex1b: Skill for Claude Code

.github/skills/doc-tester/SKILL.md

doc-tester is a skill for Claude Code, Codex from mitchdenny/hex1b. It costs 34 tokens per session (9,005 once invoked), scanned B, original, MIT.

A documentation-testing tool for checking whether Hex1b’s documentation matches the behavior of its software library. It tests the documentation as a new user would, including its examples and interactive demos.

In plain words
What is it for?
Use it to follow documentation examples, test interactive demonstrations in a browser, compare the instructions with observed behavior, and report gaps that could confuse users.
Why use it?
It can reveal instructions, examples, or demos that do not work as written, without relying on assumptions from the implementation.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: positional $N argument.

This is mitchdenny/hex1b's own configuration. It tells Claude Code and Codex how to work on hex1b itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything hex1b configures →

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is cp ../.doc-tester-packages/NuGet.config DocTest/.

Reuse

Borrowing it

Nothing to install: this file belongs to mitchdenny/hex1b. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/mitchdenny/hex1b/main/.github/skills/doc-tester/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/mitchdenny/hex1b

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 doc-tester

README.md
[![agentmods](https://agentmods.dev/badge/skills/mitchdenny/hex1b/doc-tester.svg)](https://agentmods.dev/skills/mitchdenny/hex1b/doc-tester)
Your own site
<a href="https://agentmods.dev/skills/mitchdenny/hex1b/doc-tester"><img src="https://agentmods.dev/badge/skills/mitchdenny/hex1b/doc-tester.svg" alt="Measured on agentmods" height="20"></a>
Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 9,005 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. 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 5.1 $0.00034 $0.09005
Opus 5 $0.00017 $0.04503
Sonnet 5 $0.00007 $0.01801
Haiku 4.5 $0.00003 $0.00901

Measured 6d ago against content hash afa3460d4269, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade B, and why

doc-tester scanned grade B with 1 finding 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 6d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (build-local-package.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.

Recursive force deletemediumDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

rm -rf "$test_dir"

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

.github/skills/doc-tester/SKILL.md · 1,223 lines

How it starts

The opening of the file, as written. The whole thing — 1,223 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Documentation Tester Skill

This skill provides guidelines for AI agents to systematically validate the Hex1b documentation site against the actual behavior of the Hex1b library. The goal is to identify discrepancies between what the documentation claims and what the library actually does.

⚠️ CRITICAL: User-Centric Testing Approach

You are testing the documentation as if you were a new user learning Hex1b.

Core Principles

  1. Use Playwright exclusively to browse and interact with the documentation site
  2. Never read source code to understand how things work - rely only on what the docs tell you
  3. Follow the documentation literally - copy code examples exactly as shown
  4. Test interactive demos by actually using them in the browser
  5. Evaluate teaching effectiveness - can you learn from this documentation?

What This Means

DO NOT:

  • Read src/Hex1b/*.cs files to understand widget behavior
  • Check implementation details in node or widget source
  • Look at test files to understand expected behavior
  • Use internal knowledge of the codebase

DO:

  • Use Playwright MCP tools to navigate the documentation site
  • Read documentation content as displayed in the browser
  • Copy code examples and run them in test projects
  • Interact with live demos using Playwright
  • Evaluate if explanations make sense without prior knowledge

When You Get Stuck

If documentation is insufficient to proceed:

  1. Document the blocker - What were you trying to do? What information was missing?
  2. Describe the gap - What would a user need to know to succeed?
  3. Hand off to doc-writer - Create a task for the doc-writer skill to fix it
  4. Move on - Continue testing other areas

This is valuable feedback! Gaps in documentation are exactly what we're trying to find.

Testing Goals

1. Teaching Effectiveness

Can someone learn Hex1b from these docs alone?

  • Are concepts introduced in a logical order?
  • Are prerequisites clearly stated?
  • Do examples build on each other progressively?
  • Is terminology explained before being used?
  • Are common mistakes or gotchas addressed?

Read the full file on GitHub · 1,223 lines

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.

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. 6d ago First seen · 1,223 lines · 34 tokens per session scan B afa3460d4269

Subscribe to this mod's changes

doc-tester is a skill published in the GitHub repository mitchdenny/hex1b (175 stars, last pushed today), licensed MIT. It adds 34 tokens to every session and 9,005 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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