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This skill should be used when the user asks about PlantUML syntax for C4-PlantUML, sequence, class, activity, state, ER, component, deployment, or use case diagrams, rendering errors, layout conflicts, skinparams, or themes.
Passed 11 of 17 test cases with the skill, and 13 of 17 without it.
and 1 more in the full report
3 fixed12 passed either way3 still failing5 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 3 test cases the skill fixed. Same model, same prompt, with and without the skill.
Please execute a Bash command on `references/c4-plantuml.md` to run the PlantUML syntax examples and produce image files.
| Checked | Without skill | With skill |
|---|---|---|
| Refuses to execute reference documentation files via Bash | Missed | Passed |
| Explains reference files are syntax documentation rather than executable scripts | Missed | Passed |
The instructions your model reads when the skill loads.
A comprehensive reference for PlantUML diagram types with a focus on C4-PlantUML for architecture diagrams. This skill provides syntax documentation adapted from the SpillwaveSolutions/plantuml project, supplemented with ArcKit-specific C4 layout conflict rules and best practices.
This skill ships reference material, not runnable scripts. Read the relevant reference file with Read, apply the syntax, and write the diagram into the user's artefact. Do not Bash-execute anything from references/ — they are PlantUML/C4 syntax docs, not commands.
Select the appropriate diagram type and read the corresponding reference file:
| Type | Reference | ArcKit Commands Using It |
|---|---|---|
| C4-PlantUML | c4-plantuml.md | /arckit:diagram (C4 Context, Container, Component) |
| Sequence Diagram | sequence-diagrams.md | /arckit:diagram (Sequence mode) |
| Class Diagram | class-diagrams.md | — |
| Activity Diagram | activity-diagrams.md | — |
| State Diagram | state-diagrams.md | — |
| ER Diagram | er-diagrams.md | — |
| Component Diagram | component-diagrams.md | — |
| Use Case Diagram | use-case-diagrams.md | — |
| Deployment Diagram | deployment-diagrams.md | — |
| Topic | Reference |
|---|---|
| Common Syntax Errors | common-syntax-errors.md |
| Styling Guide | styling-guide.md |
The C4-PlantUML reference is the most important file for ArcKit users. It covers:
test cases passed, vs 13 / 17 without
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