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Agent skill

Plantuml Diagrams

by BlueAndi in BlueAndi/Pixelix

Model, create, update, and embed PlantUML diagrams (.wsd files).

MITAuto-check passedDevelopment

Install Plantuml Diagrams

skills CLI
$ npx skills add BlueAndi/Pixelix --skill plantuml-diagrams -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install BlueAndi/Pixelix plantuml-diagrams --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/BlueAndi/Pixelix.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.github/skills/plantuml-diagrams .claude/skills/plantuml-diagrams && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
plantuml-diagrams
GitHub stars
443
Token cost
~1.2k tokens
SKILL.md length
494 words
Files
2 (incl. references)
Skills in repo
10
Repo updated
First seen
Licence
MIT

At a glance

Model, create, update, and embed PlantUML diagrams (.wsd files).

  • Works in 6 steps: Understand the Subject → Select the Diagram Type → Create or Update the .wsd File → …
  • : component diagram
  • SKILL.md covers When to Use, Project Conventions, Procedure and Quality Checklist, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Plantuml Diagrams is an agent skill from BlueAndi/Pixelix. Model, create, update, and embed PlantUML diagrams (.wsd files). Use for: component diagram, sequence diagram, class diagram, state diagram, activity diagram, deployment diagram, mindmap, ER diagram. Covers diagram type selection, PlantUML syntax, .wsd file conventions, and embedding via PlantUML proxy in Markdown docs.

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/diagram-types.md`).

It sits in Development, covering Diagrams. It works with ESP32. The repository describes itself as: Full RGB LED matrix, based on an ESP32 and WS2812B LEDs or emulated LEDs on TFT. The licence is MIT.

When your agent uses it

  • : component diagram
  • Sequence diagram
  • Activity diagram
  • Deployment diagram

Example prompts

  • “/plantuml-diagrams”

Workflow steps

6 steps, taken from the step headings in SKILL.md.

  1. Understand the Subject
  2. Select the Diagram Type
  3. Create or Update the .wsd File
  4. Embed the Diagram in Markdown
  5. Validate Locally (Optional)
  6. Finalize

What it can do on your machine

Read from SKILL.md and the folder at commit 390f546. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are plantuml and markdown).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • plantuml.com

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Plantuml Diagrams loads about 1.2k tokens when it runs, and up to ~2.6k if it reads all its reference files. Until then it costs about 85 tokens; SKILL.md has 494 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~85
When it runs · the whole SKILL.md, loaded when a task matches
~1.2k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~2.6k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from BlueAndi/Pixelix at commit 390f546, republished under its MIT licence (© BlueAndi). 494 words, ~1,170 tokens.

Download SKILL.mdSave it as .claude/skills/plantuml-diagrams/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
plantuml-diagrams
description
Model, create, update, and embed PlantUML diagrams (.wsd files). Use for: component diagram, sequence diagram, class diagram, state diagram, activity diagram, deployment diagram, mindmap, ER diagram. Covers diagram type selection, PlantUML syntax, .wsd file conventions, and embedding via PlantUML proxy in Markdown docs.
argument-hint
Describe the system, flow, or relationship you want to diagram

PlantUML Diagram Modeling

When to Use

Load this skill when asked to:

  • Create or update a PlantUML diagram (component, sequence, class, state, activity, deployment, mindmap)
  • Add a new .wsd file under doc/*/uml/
  • Embed a diagram image in a Markdown file via the PlantUML proxy URL
  • Convert a Mermaid or other diagram to PlantUML
  • Explain a system architecture, data flow, or state machine visually

Project Conventions

This project stores PlantUML source in .wsd files and renders them in .svg format via plantuml2svg.bat. The .wsd files are located in doc/architecture/uml/ for architecture diagrams and doc/config/uml/ for configuration diagrams. Each file should start with @startuml <diagram-name> and end with @enduml.:

  • Architecture diagrams: doc/architecture/uml/
  • Config diagrams: doc/config/uml/
  • Start every file with @startuml <diagram-name> and end with @enduml

Procedure

1. Understand the Subject
  • Ask (or infer from context) what system, flow, or relationship needs to be visualized.
  • Identify the grain: high-level context, internal component structure, inter-object sequence, or state machine?
2. Select the Diagram Type

Use diagram-types.md for syntax details. Quick selection guide:

GoalDiagram Type
Show hardware/software component structurecomponent
Show interactions over time between objectssequence
Show class relationships and inheritanceclass
Show system states and transitionsstate
Show a process, algorithm, or decision flowactivity
Show deployment on hardware / tasksdeployment
Show topic/concept hierarchymindmap
Show database table relationshipsentity (ER)
3. Create or Update the .wsd File

New diagram — create doc/<area>/uml/<diagram-name>.wsd:

plantuml
@startuml <diagram-name>

title <Human Readable Title>

' ---------------------------------------------------------------------------
' Put diagram contents here
' ---------------------------------------------------------------------------

@enduml

Existing diagram — read the current file first, then apply the minimum necessary changes.

Style rules:

  • Use ' for single-line comments, /' ... '/ for block comments.
  • Keep element labels short; use as aliases for long names: component "My Long Name" as myComp.
  • Group related elements in package or namespace blocks.
  • Limit a single diagram to ~25 elements; split into sub-diagrams when larger.
  • Apply skinparam at the top of the file to match project style when touching existing diagrams.
Show full SKILL.md (190 more words)Show less
4. Embed the Diagram in Markdown

Add the proxy image reference in the relevant .md file:

markdown
![<alt-text>](../svg/<diagram-name>.svg)

Use the master branch URL for diagrams intended for the default branch; use Development for work-in-progress.

5. Validate Locally (Optional)

If the PlantUML VSCode extension is available, open the .wsd file and use Preview Current Diagram (Alt+D) to verify the output before committing.

Alternatively, paste the source into the PlantUML online server for a quick render check.

6. Finalize
  • Confirm the .wsd filename uses snake_case consistent with neighboring files.
  • Verify the proxy URL in the Markdown points to the correct branch and file path.
  • Add or update any surrounding prose in the Markdown to reference the new diagram.

Quality Checklist

  • File starts with @startuml <name> and ends with @enduml
  • Diagram type matches the intent (structure, time, state, flow, …)
  • File is saved in the correct doc/*/uml/ folder
  • Proxy URL in Markdown is correct (branch, path, filename)
  • Diagram renders without errors (previewed locally or via online server)
  • Element count is reasonable (≤ 25); split if larger
  • Prose caption or heading is present in the Markdown document

References

© BlueAndi, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in .github/skills/plantuml-diagrams of BlueAndi/Pixelix.

  • SKILL.md
  • references/diagram-types.md

Open the folder on GitHubat commit 390f546

Compare with similar skills

Plantuml Diagrams next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Plantuml Diagrams compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Plantuml Diagrams this skillBlueAndi/Pixelix443—~1.2kAutomated safety check: PassMIT
Archify Diagramstt-a1i/archify82k—~2.9kAutomated safety check: PassMIT
JSON Canvasheyitsnoah/claudesidian2.6k18 repos~3.5kAutomated safety check: PassMIT
Diagram Designcathrynlavery/diagram-design49k1 repos~7.6kAutomated safety check: PassMIT
Fireworks Tech Graphtisfeng/Easydict15k1 repos~1.4kAutomated safety check: PassMIT
Excalidraw Diagramcoleam00/excalidraw-diagram-skill5k2 repos~6.1kAutomated safety check: PassNone

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Works with

Categories

Questions about Plantuml Diagrams

What does Plantuml Diagrams do?

Model, create, update, and embed PlantUML diagrams (.wsd files). Plantuml Diagrams is an agent skill from BlueAndi/Pixelix.wsd files).

When should I use Plantuml Diagrams?

Plantuml Diagrams fits situations like: : component diagram; sequence diagram; activity diagram; deployment diagram.

How do I install Plantuml Diagrams in Claude Code?

Run `npx skills add BlueAndi/Pixelix --skill plantuml-diagrams -a claude-code`. Or copy the skill folder (.github/skills/plantuml-diagrams in BlueAndi/Pixelix) into .claude/skills/plantuml-diagrams in your project. Claude Code loads it when a task matches its description.

How do I install Plantuml Diagrams in Codex?

Run `npx skills add BlueAndi/Pixelix --skill plantuml-diagrams -a codex`. Or copy the skill folder (.github/skills/plantuml-diagrams in BlueAndi/Pixelix) into .agents/skills/plantuml-diagrams in your project. Codex loads it when a task matches its description.

Can I use Plantuml Diagrams in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add BlueAndi/Pixelix --skill plantuml-diagrams -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/plantuml-diagrams, .gemini/skills/plantuml-diagrams, .github/skills/plantuml-diagrams and .opencode/skills/plantuml-diagrams in your project.

What does Plantuml Diagrams need to run?

SKILL.md names no scripts, command-line tools or credentials: Plantuml Diagrams is instructions for the agent only.

Does Plantuml Diagrams access the network?

SKILL.md names 1 domain. As links in the text: plantuml.com. This is read from the text; nothing was executed.

Is Plantuml Diagrams safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Plantuml Diagrams use?

Plantuml Diagrams is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Plantuml Diagrams use?

About 1.2k tokens (SKILL.md is roughly 4.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.4k tokens, read only when the agent opens those files.

What are the alternatives to Plantuml Diagrams?

Skills that share tags, products or a category with Plantuml Diagrams: Archify Diagrams (tt-a1i/archify, 82k stars), JSON Canvas (heyitsnoah/claudesidian, 2.6k stars), Diagram Design (cathrynlavery/diagram-design, 49k stars) and Fireworks Tech Graph (tisfeng/Easydict, 15k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Plantuml Diagrams?

BlueAndi (a GitHub user) maintains it in BlueAndi/Pixelix, which has 443 GitHub stars. The repository holds 10 skills in this directory. The repository was last updated on October 8, 2026.

Source: BlueAndi/Pixelix on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.