Gen uml

Lean personal Claude Code skills pack — my conventions, task flow, and quality lenses. Requires the superpowers plugin.

Install

npx -y skills add Endika/eskills --skill gen-uml

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Use when you need a Mermaid diagram (architecture, flow, or sequence) generated from existing code, and a check that the diagram matches what was actually built.

SKILL.md

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gen-uml

Overview

Generate a Mermaid diagram from existing code — architecture, flow, or sequence — and verify it reflects what the code actually does, not what it was supposed to do.

Steps

Read the real code for the slice you're diagramming (entry points, modules, call/data flow). Diagram what exists.
Pick the diagram type that answers the question being asked (below).
Emit Mermaid.
Match-check (required): walk the diagram against the code one node/edge at a time. Every box maps to a real module/function; every arrow to a real call/dependency. Drop or fix anything you can't point to in the source. A diagram that quietly diverges is worse than none.

Types & examples

Architecture (modules/dependencies):

graph TD
  UI[UI] --> UC[Use cases]
  UC --> SVC[Services]
  SVC --> REPO[Repository]
  REPO --> DB[(Store)]

Flow (a process / decision path):

flowchart TD
  A[Receive task] --> B{Brownfield?}
  B -- yes --> C[Explore code]
  B -- no --> D[Brainstorm]
  C --> D --> E[Plan]

Sequence (interaction over time):

sequenceDiagram
  participant C as Client
  participant R as Repo
  participant DB as Store
  C->>R: save(entity)
  R->>DB: update(blob)
  DB-->>R: version
  R-->>C: ok

Output

The Mermaid block plus one line per diagram confirming the match-check passed (or listing what was corrected).