A diagram-creation skill for showing software structure and system behaviour with LikeC4 or Mermaid. These are text-based tools for architecture, sequence, and data-flow diagrams.

Use it to create architecture diagrams, C4 models, sequence diagrams, dynamic flows, and data-flow diagrams.

It turns system designs and interactions into diagrams that are easier to inspect than prose alone.

diagram — Skill for Claude Code by agentpatterns/craft

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 agentpatterns/craft --skill diagram

Clone the repo

git clone --depth 1 https://github.com/agentpatterns/craft

Made for: Claude Code.

Or install crafter, the plugin that ships this one along with the rest of its 11 skills, 5 agents.

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/agentpatterns/craft/diagram/github.svg)](https://agentmods.dev/skills/agentpatterns/craft/diagram)

Your own site

<a href="https://agentmods.dev/skills/agentpatterns/craft/diagram"><img src="https://agentmods.dev/badge/skills/agentpatterns/craft/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.

Your own site · 80×15

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

Per session 47 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,561 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	$0.00047	$0.01561
Opus 5.5	$0.00019	$0.00624
Sonnet 5.5	$0.00009	$0.00312
Haiku 4.5	$0.00005	$0.00156

Measured 2mo ago against content hash 92ff0ee9a62f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

diagram 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 2mo 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.

plugins/crafter/skills/diagram/SKILL.md · 151 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

What ships with it

7 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.

2mo ago First seen · 151 lines · 47 tokens per session scan A 92ff0ee9a62f

Subscribe to this mod's changes

diagram is a skill published in the GitHub repository agentpatterns/craft (5 stars, last pushed 7mo ago), with no licence file. It adds 47 tokens to every session and 1,561 once invoked, about $0.0002 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 2026-08-31.

Design and UX

diagram next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
diagramagentpatterns/craft	Skill	5	7mo ago	none	A	47	Claude Code
webgl-holographic-foilnexu-io/open-design	Skill	106k	today	Apache-2.0	A	41	Claude Code, Codex
html-ppt-hermes-cyber-terminalnexu-io/open-design	Skill	106k	today	Apache-2.0	A	53	Claude Code, Codex
html-ppt-taste-brutalistnexu-io/open-design	Skill	106k	today	Apache-2.0	A	78	Claude Code, Codex
visual-ralphYeachan-Heo/oh-my-codex	Skill	34k	today	MIT	A	52	Codex
glance-canonical-layoutsandroid/skills	Skill	10k	yesterday	Apache-2.0	A	56	Claude Code
accessibilitymicrosoft/hve-core	Skill	1.6k	today	MIT	A	47	Claude Code