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 BlacklineCloud/agent-skills --skill event-storminggit clone --depth 1 https://github.com/BlacklineCloud/agent-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/blacklinecloud/agent-skills/event-storming)<a href="https://agentmods.dev/skills/blacklinecloud/agent-skills/event-storming"><img src="https://agentmods.dev/badge/skills/blacklinecloud/agent-skills/event-storming.svg" alt="Measured on agentmods" 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 | $0.00078 | $0.00551 |
| Opus 5 | $0.00039 | $0.00275 |
| Sonnet 5 | $0.00016 | $0.00110 |
| Haiku 4.5 | $0.00008 | $0.00055 |
Grade A, and why
event-storming 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 8d 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 — 40 lines — stays where its author put it; the contents beside it link to each section on GitHub.
EventStorming
Use this skill to facilitate EventStorming for domain discovery and DDD-first software design across Big Picture, Process Modelling, Software Design, and document-first pre-work. Treat SKILL.md as the entrypoint: choose the format, collect minimum context, load only the references needed for the chosen run, and end with one canonical markdown handoff.
Workflow
- Choose the format or document-first pre-work based on the user's goal and the quality of available evidence.
- Collect minimum context:
- business scope and target decision
- participants or source documents
- major actors and systems
- main pain points, open questions, and constraints
- Load only the reference files needed for the chosen format.
- Model the business flow before implementation details and keep the discussion domain-first.
- Produce one canonical markdown handoff and run
python3 scripts/validate_output.py <path-to-output>before treating it as final.
Guardrails
- Discovery before design.
- Use business language first.
- Write domain events in past tense.
- Model commands as intentional business actions.
- Model policies as repeatable reactions in the form
Whenever X, then Y. - Surface uncertainty explicitly with
Fact,Assumption,Open question,Risk, andDecision. - Do not jump to APIs, schemas, or implementation structure before the business flow is coherent.
Reference Routing
- Load facilitation-workflow.md for format choice, chaining, and per-format workshop sequence.
- Load document-first-mode.md for extraction from business documents and next-format selection.
- Load notation-and-modeling.md for notation, grammar, DDD heuristics, and acceptance-test extraction.
- Load deliverables.md for canonical handoff templates.
- Load output-patterns.md for markdown structure, stable labels, and output contract details.
- Load patterns.md and anti-patterns.md for facilitation moves and recovery patterns.
What ships with it
9 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.
- agents/openai.yaml 400 B
- references/anti-patterns.md 4.2 KB
- references/deliverables.md 5.7 KB
- references/document-first-mode.md 4.0 KB
- references/facilitation-workflow.md 6.9 KB
- references/notation-and-modeling.md 10 KB
- references/output-patterns.md 3.7 KB
- references/patterns.md 2.5 KB
- scripts/validate_output.py 11 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.
- 8d ago First seen · 40 lines · 78 tokens per session scan A 84578480d653
event-storming is a skill published in the GitHub repository BlacklineCloud/agent-skills (1 stars, last pushed yesterday), licensed MIT. It adds 78 tokens to every session and 551 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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