sql_to_ER

Name: sql_to_ER Review
Item: sql_to_ER
Rating: 2.3
Author: Aaron Matthews

Skill Data & Analytics Poor

Works inClaude Code

Poor Scanned — metadata only

Reduces time spent manually documenting database schemas and eliminates discrepancies between documentation and actual structure, enabling faster onboarding …

Converts SQL CREATE TABLE statements or DBML code into Chen-model ER diagrams. Runs as a free, login-free web tool (pure front-end) or installs as an agent skill with one command. Diagrams support drag-to-arrange nodes, double-click editing, smooth zoom/rotate, and one-click automatic layout optimization.

Generate entity-relationship diagrams from existing SQL database schemas quickly
Convert DBML files into visual ER diagrams for documentation and design review
Visualize database table relationships to understand legacy system architecture

181 starsAGPL-3.0 (check with legal)FreeQuick setup

Below standard — Significant caveats apply. Not recommended without careful review of the security and evaluation sections.

Why it matters

Reduces time spent manually documenting database schemas and eliminates discrepancies between documentation and actual structure, enabling faster onboarding and architectural reviews.

Best for

Data engineers and architects needing quick ER diagram generation from existing SQL or DBML definitions.

Works in

Claude Code Claude Cowork Claude Chat

Source

https://github.com/ystemsrx/sql_to_ER

By ystemsrx

How to Get It

Option 1: Claude Desktop App (Code Mode)Click the + button next to the prompt box → Plugins → Add plugin. Search and click Install. Skills work in Claude Code only.

Option 2: Paste into Claude CodeCopy the command below and paste it into your conversation. Claude will install it.

Command

npx skills add ystemsrx/sql_to_er

Tip: Paste this into a Claude Code conversation. Verify command matches your Claude Code version.

First thing to try

After installing, paste this into Claude:

Help me generate entity-relationship diagrams from existing SQL database schemas quickly

CostFree

Trust Signals Auto-scanned

Stars181Contributors5Last updated2026-08-01LicenseAGPL-3.0 (check with legal)Known CVEsNone foundSources: GitHub Advisory Database + OSV.dev · Scanned 2026-08-12 · scanner vattempted-no-data

Community Pulse Growing

Discussed on Hacker News

Free SQL→ER diagram tool, runs in the browser, nothing uploaded — Hacker News · 366 pts
MIX: A compiler from SQL to Erlang code using Amazon DynamoDB — Hacker News · 6 pts
Erlang – sql to mnesia equivalent — Hacker News · 2 pts

3 mentions across 1 sources

Reviewer notes

Auto-scanned review. These are observations, not a security certification.

Scored from trust signals (evidence-eval-v1): 176 GitHub stars; contributors unknown; last commit 0d ago; license AGPL-3.0.

Things to check

Scanned, not hands-on tested — this entry was auto-scanned from public metadata (GitHub metrics, license, security flags). No reviewer has run it, and no tool-specific limitations have been documented yet.
License (AGPL-3.0) may restrict commercial use. Check with your legal team.

How to evaluate tools before deploying →

Data shown here comes from public APIs and automated scanning. Reviewer notes reflect one person's experience. This is not a security certification or legal recommendation. Always evaluate tools according to your own organization's policies.

Evaluation Scores

Evaluation

Ease of Use

1/5

Versatility

3/5

Reliability

3/5

Security

3/5

Overall score2.30 / 5.00 PoorEvaluatedJul 2026

Scored from trust signals (evidence-eval-v1): 176 GitHub stars; contributors unknown; last commit 0d ago; license AGPL-3.0.

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