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.
npx skills add ChinaIceF/staruml-skills --skill staruml-mdj-statechartgit clone --depth 1 https://github.com/ChinaIceF/staruml-skillsWrote 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.
[](https://agentmods.dev/skills/chinaicef/staruml-skills/staruml-mdj-statechart)<a href="https://agentmods.dev/skills/chinaicef/staruml-skills/staruml-mdj-statechart"><img src="https://agentmods.dev/badge/skills/chinaicef/staruml-skills/staruml-mdj-statechart/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.
<a href="https://agentmods.dev/skills/chinaicef/staruml-skills/staruml-mdj-statechart"><img src="https://agentmods.dev/badge/skills/chinaicef/staruml-skills/staruml-mdj-statechart.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00074 | $0.03005 |
| Opus 5 | $0.00037 | $0.01503 |
| Sonnet 5 | $0.00015 | $0.00601 |
| Haiku 4.5 | $0.00007 | $0.00300 |
Grade A, and why
staruml-mdj-statechart 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.
How it starts
The opening of the file, as written. The whole thing — 261 lines — stays where its author put it; the contents beside it link to each section on GitHub.
StarUML MDJ Statechart Skill
Purpose
This skill enables safe creation, inspection, and modification of UML Statechart Diagrams (State Machines) inside StarUML .mdj files via the staruml_state_tool package.
The .mdj format is a deeply nested JSON document with auto-generated IDs, $ref cross-references, _parent backlinks, ownedElements/regions/vertices/transitions containment arrays, source/target references, and view hierarchies (ownedViews, model, tail, head). Do not construct or edit these structures manually. Use the CLI or Python API instead.
This tool is statechart-only. It does not touch class diagrams or other UML diagram types.
When to Use This Skill
- Create a new StarUML
.mdjfile with a state machine. - Add a UML state machine to an existing
.mdj. - Add normal states, initial pseudostates, final states, and other pseudostates (choice, junction, fork, join, etc.).
- Add transitions between states, with optional triggers and guards.
- Edit an existing transition's guard, trigger, or kind.
- Rename or remove states and transitions.
- Inspect existing state machines: list states, transitions, guards, triggers.
- Generate a statechart from a natural language description (book lifecycle, order flow, door controller, traffic light, etc.).
Do Not Use This Skill When
- The task involves class diagrams, sequence diagrams, use case diagrams, activity diagrams, component diagrams, deployment diagrams, package diagrams, or object diagrams.
- The task requires composite states, nested states, multi-region state machines, entry/do/exit activities, or transition effects/actions — these are not supported by the current tool API.
- The task requires automatic layout or custom visual styling (font, color, line style, custom edge routing, custom state sizes) — the tool uses fixed defaults.
- The
.mdjfile is corrupted and fails to parse. - The user only wants a textual explanation and does not need to generate or modify a
.mdjfile.
What ships with it
8 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.
- examples/create_book_lifecycle_statechart.md 1.7 KB
- examples/create_library_location_statechart.md 3.2 KB
- examples/python_api_example.py 2.0 KB runs code
- reference/staruml_state_tool_capabilities.md 12 KB
- staruml_state_tool/__init__.py 40 B runs code
- staruml_state_tool/cli.py 11 KB runs code
- staruml_state_tool/parser.py 13 KB runs code
- staruml_state_tool/state_diagram.py 28 KB runs code
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 · 261 lines · 74 tokens per session scan A 7a2d3b63e623
staruml-mdj-statechart is a skill published in the GitHub repository ChinaIceF/staruml-skills (5 stars, last pushed 3mo ago), licensed MIT. It adds 74 tokens to every session and 3,005 once invoked, about $0.0004 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.
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