event-storming

event-storming is a skill for Claude Code, Codex from jacexh/skill-workshop. It costs 33 tokens per session (1,398 once invoked), scanned A, original, no licence file.

A collaborative discovery skill for finding Bounded Contexts and Aggregate Roots in backend stories, business scenarios, specifications, or domain models. These are ways of dividing a business system into clear areas and identifying the main entities within each area.

In plain words
What is it for?
Use it during strategic backend design and domain modelling workshops.
Why use it?
It helps turn loosely described business behaviour into clearer system boundaries and responsibilities.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

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.

agentmods
npx agentmods add skills/jacexh/skill-workshop/event-storming
Any agent
npx skills add jacexh/skill-workshop --skill event-storming
Clone the repo
git clone --depth 1 https://github.com/jacexh/skill-workshop

Made for: Claude Code, Codex.

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 event-storming

README.md
[![agentmods](https://agentmods.dev/badge/skills/jacexh/skill-workshop/event-storming.svg)](https://agentmods.dev/skills/jacexh/skill-workshop/event-storming)
Your own site
<a href="https://agentmods.dev/skills/jacexh/skill-workshop/event-storming"><img src="https://agentmods.dev/badge/skills/jacexh/skill-workshop/event-storming.svg" alt="Measured on agentmods" height="20"></a>
Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,398 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00033 $0.01398
Opus 5 $0.00016 $0.00699
Sonnet 5 $0.00007 $0.00280
Haiku 4.5 $0.00003 $0.00140

Measured today against content hash 988de9929d55, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

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 today.

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.

codex-plugins/ddd-expert/skills/event-storming/SKILL.md · 103 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. today Changed · +2 lines 988de9929d55
  2. 5d ago First seen · 101 lines · 33 tokens per session scan A a9d9ce9a211f

Subscribe to this mod's changes

event-storming is a skill published in the GitHub repository jacexh/skill-workshop (2 stars, last pushed yesterday), with no licence file. It adds 33 tokens to every session and 1,398 once invoked, about $0.0002 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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