What is diagramming-expert?

A guide to communicating systems and ideas with text-based diagrams, using characters, lines, and structured notation. It covers flows, relationships, hierarchies, timelines, and decision logic.

Use it to show system architecture, process steps, state changes, organizational hierarchies, data relationships, decision trees, feedback loops, and before-and-after comparisons.

It makes complex structures easier to understand and maintain in places where image-based diagrams are unavailable or inconvenient.

diagramming-expert — Skill for Claude Code by curiositech

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 curiositech/some_claude_skills --skill diagramming-expert

Clone the repo

git clone --depth 1 https://github.com/curiositech/some_claude_skills

Made for: Claude Code.

Or install diagramming-expert, the plugin that ships this one along with the rest of its 1 skill.

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/curiositech/some_claude_skills/diagramming-expert/github.svg)](https://agentmods.dev/skills/curiositech/some_claude_skills/diagramming-expert)

Your own site

<a href="https://agentmods.dev/skills/curiositech/some_claude_skills/diagramming-expert"><img src="https://agentmods.dev/badge/skills/curiositech/some_claude_skills/diagramming-expert/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/curiositech/some_claude_skills/diagramming-expert"><img src="https://agentmods.dev/badge/skills/curiositech/some_claude_skills/diagramming-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 92 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,397 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. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00092	$0.02397
Opus 5	$0.00046	$0.01198
Sonnet 5	$0.00018	$0.00479
Haiku 4.5	$0.00009	$0.00240

Measured 12d ago against content hash 98dbf84baf3c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

diagramming-expert 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 12d 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

diagramming-expert — 98% identical, 26 lines differ

.claude/skills/diagramming-expert/SKILL.md · 296 lines

How it starts

The opening of the file, as written. The whole thing — 296 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Diagramming Expert

Master of text-based visual communication. Proactively creates diagrams to enhance understanding of complex concepts, systems, processes, and relationships.

Core Philosophy

"Above all else, show the data." — Edward Tufte

Diagrams should:

Reduce cognitive load — not add to it
Maximize signal — minimize noise (data-ink ratio)
Be maintainable — easy to update as understanding evolves
Work everywhere — monospace text renders universally

When to Use This Skill

Use for:

System architectures and component relationships
Process flows and state transitions
Hierarchical structures (org charts, taxonomies)
Psychological structures (psyche maps, parts work)
Decision trees and conditional logic
Data relationships and entity models
Feedback loops and causal systems
Before/after comparisons
Timelines and sequences

NOT for:

Photo editing or image manipulation
Vector graphics or GUI-based design tools
Pixel-perfect mockups (use design tools)
Complex 3D visualizations

Ask yourself: "Would this be clearer with a picture?" If yes → diagram it.

Diagram Types Reference

See /references/diagram-types.md for complete taxonomy

Quick Reference

Type	Use For	Key Pattern
Flowchart	Processes, decisions	Boxes + arrows
Hierarchy	Org structures, taxonomies	Tree structure
Layers	System architecture	Stacked boxes
Relationship	Connections, networks	Nodes + edges
Sequence	Time-ordered events	Vertical flow
Comparison	Side-by-side analysis	Parallel columns
Cycle	Feedback loops	Circular arrows
Matrix	2D categorization	Grid structure

Character Reference

See /references/unicode-characters.md for complete character set

Essential Characters

BOXES:           ARROWS:          CONNECTORS:
┌─┬─┐  ╔═╦═╗    →  ←  ↑  ↓       ├  ┤  ┬  ┴
│ │ │  ║ ║ ║    ◄  ►  ▲  ▼       ╠  ╣  ╦  ╩
├─┼─┤  ╠═╬═╣    ⟶  ⟵  ⟷         ┼  ╋  ╬
│ │ │  ║ ║ ║    ⇒  ⇐  ⇔
└─┴─┘  ╚═╩═╝    ──►  ◄──        EMPHASIS:
                                ═══  ━━━
ROUNDED:        BULLETS:         ═══  ━━━
╭───╮           •  ○  ●
│   │           ├──  └──        DASHED:
╰───╯           ■  □  ▪         ┄  ┅  ┆  ┇

Read the full file on GitHub · 296 lines

Files

What ships with it

5 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.

12d ago First seen · 296 lines · 92 tokens per session scan A 98dbf84baf3c

Subscribe to this mod's changes

diagramming-expert is a skill published in the GitHub repository curiositech/some_claude_skills (219 stars, last pushed 5d ago), licensed MIT. It adds 92 tokens to every session and 2,397 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.

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diagramming-expert