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generate-diagram

generate-diagram is a skill for Claude Code from edmondop/diagram-claude-plugin. It costs 118 tokens per session (4,831 once invoked), scanned A, original, MIT.

Instructions for creating diagrams such as flowcharts, architecture diagrams, entity-relationship diagrams, and sequence diagrams.

In plain words
What is it for?
Use it to plan and produce technical diagrams, including editable hand-drawn diagrams and standard UML, C4, and domain-design diagrams.
Why use it?
It helps choose an appropriate diagram format and creation method instead of treating every diagram request the same way.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Part of the diagram-claude-plugin plugin — 1 skill shipped together

not rated 2repo 3mo ago A scan 118 tokens original MIT

Good fit Use it to plan and produce technical diagrams, including editable hand-drawn diagrams and standard UML, C4, and domain-design diagrams.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/edmondop/diagram-claude-plugin/generate-diagram
View source ↗ edmondop/diagram-claude-plugin
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 edmondop/diagram-claude-plugin --skill generate-diagram
Clone the repo
git clone --depth 1 https://github.com/edmondop/diagram-claude-plugin

Made for: Claude Code.

Or install diagram-claude-plugin, 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.

agentmods badge for generate-diagram

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/edmondop/diagram-claude-plugin/generate-diagram"><img src="https://agentmods.dev/badge/skills/edmondop/diagram-claude-plugin/generate-diagram.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 118 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,831 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 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 $0.00118 $0.04831
Opus 5 $0.00059 $0.02416
Sonnet 5 $0.00024 $0.00966
Haiku 4.5 $0.00012 $0.00483

Measured 11d ago against content hash 04f76cc41042, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

generate-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 11d ago.

The scan reads SKILL.md. This mod also ships 18 executable files (references/examples/architecture-graphviz.py, references/examples/block-blockdiag.py, references/examples/block-schemdraw.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.

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.

skills/generate-diagram/SKILL.md · 452 lines

How it starts

The opening of the file, as written. The whole thing — 452 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Diagram Generation

Generate professional diagrams by routing each request to the best-fit tool. For UML, C4, and DDD diagram types, use PlantUML (text-based, standard notation). For everything else, use Python libraries via uv inline scripts. For editable hand-drawn diagrams, use Excalidraw JSON.

Interaction Protocol

  1. Classify the diagram type. If ambiguous, ask:

    What kind of diagram?

    • C4 (Context / Container / Component)
    • UML Use Case
    • UML Activity / BPMN-style workflow
    • UML State Machine
    • DDD Context Map
    • Subdomain Decomposition (WBS)
    • ERD (Conceptual or Logical)
    • Flowchart / pipeline
    • Architecture (generic boxes + arrows)
    • Cloud/infra architecture (AWS, GCP, K8s icons)
    • Pyramid / stacked layers
    • Sequence diagram
    • Network / DAG
    • Block diagram
    • Excalidraw (editable, hand-drawn sketch style)

  2. Pick the tool from the routing table. For PlantUML types, do NOT offer Python alternatives — PlantUML is the only correct choice for standard notation. Skip to step 3.

  3. Ask output path: "Where should I save the diagram?" Default to current directory if the user doesn't specify.

  4. Check prerequisites based on the tool:

    For PlantUML:

    plantuml -version 2>/dev/null || docker image inspect plantuml/plantuml-cli:plantuml-cli-v1.0.1 >/dev/null 2>&1

    If neither is available, show:

    • macOS: brew install plantuml
    • Docker: docker pull plantuml/plantuml-cli:plantuml-cli-v1.0.1
    • Do NOT fall back to a Python approximation. Stop and ask the user to install one of the above.

    For Graphviz-dependent Python libraries:

    dot -V

  5. Load the relevant reference for the tool you picked (see below). Generate the diagram following that reference.

    • PlantUML: write a .puml file, render with plantuml -tsvg or Docker. Open the SVG.
    • Python: write a uv run-compatible inline script. Run it. Open the SVG.
    • Excalidraw: write a .excalidraw JSON file. Open it.

Read the full file on GitHub · 452 lines

Files

What ships with it

37 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. 11d ago First seen · 452 lines · 118 tokens per session scan A 04f76cc41042

Subscribe to this mod's changes

generate-diagram is a skill published in the GitHub repository edmondop/diagram-claude-plugin (2 stars, last pushed 3mo ago), licensed MIT. It adds 118 tokens to every session and 4,831 once invoked, about $0.0006 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 2026-08-31.

Design and UX
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