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blog: Skill for Claude Code

.claude/skills/excalidraw-diagram/SKILL.md

excalidraw-diagram is a skill for Claude Code from gbmhunter/blog. It costs 34 tokens per session (5,469 once invoked), scanned B, original, no licence file.

A skill for creating Excalidraw diagram files. Excalidraw is a drawing tool for making diagrams, such as workflows, system designs, and explanations.

In plain words
What is it for?
Visualizing workflows, architectures, and other concepts as Excalidraw diagrams.
Why use it?
It gives the agent a defined way to turn ideas into visual diagrams that can be edited in Excalidraw.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

This is gbmhunter/blog's own configuration. It tells Claude Code how to work on blog 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 blog configures →

not rated 74repo +5 2d ago B scan 34 tokens custom licence
View source ↗ gbmhunter/blog blog.mbedded.ninja
Reuse

Borrowing it

Nothing to install: this file belongs to gbmhunter/blog. 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/gbmhunter/blog/master/.claude/skills/excalidraw-diagram/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/gbmhunter/blog

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.

agentmods badge for excalidraw-diagram

README.md
[![agentmods](https://agentmods.dev/badge/skills/gbmhunter/blog/excalidraw-diagram/github.svg)](https://agentmods.dev/skills/gbmhunter/blog/excalidraw-diagram)
Your own site
<a href="https://agentmods.dev/skills/gbmhunter/blog/excalidraw-diagram"><img src="https://agentmods.dev/badge/skills/gbmhunter/blog/excalidraw-diagram/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 excalidraw-diagram

Your own site · 80×15
<a href="https://agentmods.dev/skills/gbmhunter/blog/excalidraw-diagram"><img src="https://agentmods.dev/badge/skills/gbmhunter/blog/excalidraw-diagram.svg" alt="Reviewed on agentmods" width="80" 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 5,469 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00034 $0.05469
Opus 5.5 $0.00014 $0.02188
Sonnet 5.5 $0.00007 $0.01094
Haiku 4.5 $0.00003 $0.00547

Measured 2mo ago against content hash f737a9720455, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

excalidraw-diagram 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 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (references/render_excalidraw.py), 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.

Subtle steeringmediumPrompt injection

Instructions that bias recommendations or shape behaviour without the user noticing.

- **Don't write a Python generator script.** The templating and coordinate math seem helpful but introduce a layer of indirection that makes debugging harder. Hand-crafted JSON with descriptive IDs is more maintainable.
.claude/skills/excalidraw-diagram/SKILL.md · 553 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

8 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.

  1. 2mo ago First seen · 553 lines · 34 tokens per session scan B f737a9720455

Subscribe to this mod's changes

excalidraw-diagram is a skill published in the GitHub repository gbmhunter/blog (74 stars, last pushed 2d ago), with no licence file. It adds 34 tokens to every session and 5,469 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it B with 1 finding (subtle steering). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Design and UXblogelectronicsembeddedengineeringhugowebsite
Related

excalidraw-diagram compared with skills from other repositories

excalidraw-diagram next to 6 skills from other repositories
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excalidraw-diagramgbmhunter/blogSkill742d agononeB34Claude Code
ce-prototypeEveryInc/compound-engineering-pluginSkill26kyesterdayMITA69Claude Code
ce-polishEveryInc/compound-engineering-pluginSkill26kyesterdayMITA28Claude Code, Codex
senior-data-engineerbenchflow-ai/skillsbenchSkill1.9k2d agoApache-2.0A100Claude Code, Codex
article-magazinenexu-io/html-anythingSkill9.4k24d agoApache-2.0A23Claude Code, Codex
blog-postnexu-io/html-anythingSkill9.4k24d agoApache-2.0A25Claude Code, Codex
deck-blueprintnexu-io/html-anythingSkill9.4k24d agoApache-2.0A27Claude Code, Codex