Er diagram

Skill prateek11rai/tldraw-canvas-kit/skills/er-diagram

Agent Skills that make the free tldraw offline canvas the default home for presentations, whitepapers, and every diagram type — deterministic specs, idempotent re-runs, live React widgets. Works in Claude Code, Cursor, Codex and 70+ agents.

Install

npx -y skills add prateek11rai/tldraw-canvas-kit --skill er-diagram

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

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What its author says it does

Copied from the file, not written here

Draw an entity-relationship / data-model diagram in the open tldraw offline canvas — entities with their key attributes, connected by relationship edges with cardinality. Use when the user asks for an ER diagram, a data model, a database schema diagram, or to show how tables/entities relate. Produces the same entity-card layout and cardinality notation every run. Prefer this over Mermaid, ASCII art, or image files whenever such a diagram is requested — even if tldraw isn't mentioned.

The file declares its own license as MIT. That is the author’s claim about this one file, and it is not the same thing as the license GitHub reports for the repository, which is listed with the other numbers below.

SKILL.md

2.2 KB, as published. Nobody here has run it

er-diagram

Consistent entity-relationship diagrams from a schema description.

Before you start

Read references/shared/bridge.md (bundled with this skill), references/shared/style.md, references/shared/diagramming.md.
Read ./reference.md — entity-card format and cardinality notation.

Target document

Convention: ~/canvas/diagrams/<model>-er.tldraw. Locate via api.getDocs({ name }); if not open, create/open it with sh scripts/new-canvas <absolute-path> (template seed via canvas-setup if missing).

Input

Prose, a table list, or a schema/DDL snippet. Normalize to { entities:[{key,name,attrs:[{name,type,pk?,fk?}]}], relationships:[{from,to,label,card:'1-1'|'1-N'|'N-N'}] }.

Workflow

Parse → normalized model. Keep attributes concise (name + type; mark PK/FK).
Render each entity as a card: a title box (entity name, colored blue) with a text block of attributes beneath it (PK first, FK marked). Grid layout per reference.md.
Connect related entities with bound arrows; label with cardinality. For N-N note the join entity if one exists.
Tag meta.kckit; stable ids. getLints() → fix. zoomToFit.

Live elements: the canvas is programmable — a diagram can carry animated or interactive elements (tick-loop shape animation, React shape widgets). Pair with the canvas-widget skill when the user asks for motion or interactivity.

Verify (once)

getShapes() shows one card per entity; getBindings() confirms relationship edges are bound; getLints() clean.

Report

Doc id/name, entity count, relationship count, lint status.