Individual skill
entity-relationship-diagram
Turn a data model into an entity-relationship (ER) diagram. Use when asked to design a schema, model data, show how tables/entities relate, or diagram a database. Produces a ready-to-render Mermaid ER diagram (renders live, exportable as PNG/SVG) plus key attributes, cardinality, and design notes.
plugins/pm-visuals/skills/entity-relationship-diagram/SKILL.md
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- Last checked
- Nov 9, 2026
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- Repository last updated
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- License
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# Entity-Relationship Diagram Skill
Before you write a migration, it pays to see the data model: the entities, their key fields, and how they
relate (one-to-many, many-to-many). This skill turns a described domain into a clean **Mermaid ER diagram**
with proper cardinality notation and the attributes that matter.
## Required Inputs
Ask for these only if they aren't already provided:
- **The entities** — the core objects/tables (User, Order, Product…).
- **Relationships** — how they relate, and the cardinality (a user *has many* orders, an order *has many* line items).
- **Key attributes** — the important fields per entity (especially keys); full column lists aren't required.
- **The domain** — what the system does, so the model is realistic.