Database Schema Designer
Design and visualize database schemas with normalization guidance, relationship mapping, and ERD generation
- Type
- Plugin
- Repository
- jeremylongshore/tons-of-skills-marketplace
- GitHub stars
- 2.8k
- License
- MIT
- Repo last updated
- Sep 27, 2026
- Version
- 1.24.0
- Author
- Claude Code Plugins
What Database Schema Designer is
Database Schema Designer is a plugin published in the jeremylongshore/tons-of-skills-marketplace repository on GitHub, which has about 2.8k stars. The repository describes itself as: “Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com.”
A plugin is a package that bundles skills, slash commands, subagents, hooks, and MCP connectors so they install together. Plugins are plain files with a manifest at .claude-plugin/plugin.json, and they work in both Claude Code and Claude Cowork.
Installing Database Schema Designer adds everything it ships in one step. Connectors inside a plugin still need to be connected separately, and hooks and subagents only run in Cowork and Claude Code, not in regular chat.
How to install Database Schema Designer
Claude Code
- Add the repository as a plugin marketplace: claude plugin marketplace add jeremylongshore/tons-of-skills-marketplace
- Install the plugin: claude plugin install database-schema-designer@<marketplace-name>, using the marketplace name from the repository's .claude-plugin/marketplace.json.
- Restart the session if the new skills or commands don't appear straight away.
Claude Cowork
- Open Customize → Plugins and choose Add marketplace.
- Enter jeremylongshore/tons-of-skills-marketplace (the owner/repo shorthand works for GitHub).
- Find Database Schema Designer in the list, click Install, then connect any connectors it needs from its Connectors tab.
New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.
Inside the source file
An excerpt from plugins/database/database-schema-designer/.claude-plugin/plugin.json, shared under the repository's MIT license. Read the full file on GitHub.
Design and visualize database schemas with normalization guidance and ERD generation.
Installation
/plugin install database-schema-designer@claude-code-plugins-plusUsage
/design-schemaFeatures
- Normalization Guidance: 1NF through BCNF
- ERD Generation: Mermaid diagram output
- Relationship Mapping: All relationship types
- Best Practices: Industry-standard patterns
- SQL Generation: Complete CREATE statements
Example
Describe your application, and receive a complete database schema with tables, relationships, indexes, and visualization.
License
MIT
Before you install
- Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
- Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
- Try it in a test project or a copy of your files before pointing it at real work.
- Pin the version you tested, and review changes before updating.
- Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.
FAQ
What is Database Schema Designer?
Database Schema Designer is a plugin for Claude Code and Claude Cowork from the jeremylongshore/tons-of-skills-marketplace repository on GitHub. Design and visualize database schemas with normalization guidance, relationship mapping, and ERD generation
How do I install Database Schema Designer in Claude Code?
Add the repository as a plugin marketplace: claude plugin marketplace add jeremylongshore/tons-of-skills-marketplace Install the plugin: claude plugin install database-schema-designer@<marketplace-name>, using the marketplace name from the repository's .claude-plugin/marketplace.json. Restart the session if the new skills or commands don't appear straight away.
Can I use Database Schema Designer in Claude Cowork?
Open Customize → Plugins and choose Add marketplace. Enter jeremylongshore/tons-of-skills-marketplace (the owner/repo shorthand works for GitHub). Find Database Schema Designer in the list, click Install, then connect any connectors it needs from its Connectors tab.
Is Database Schema Designer safe to install?
It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.
Similar resources
- Overnight Setup Setup overnight development with Git hooks for autonomous TDD sessions Slash Command · jeremylongshore/tons-of-skills-marketplace
- Oraclecloud Pack Claude Code skill pack for Oracle Cloud (26 skills) Plugin · jeremylongshore/tons-of-skills-marketplace
- Pack Smart packing list generator based on destination weather, activities, trip Slash Command · jeremylongshore/tons-of-skills-marketplace
- Owner Router Recommend likely bug owners using strict 6-level routing precedence with staleness detection and override memory. Use when routing clustered bugs to teams after evidence gathering. Subagent · jeremylongshore/tons-of-skills-marketplace
- Database Security Scanner Database plugin for database-security-scanner Plugin · jeremylongshore/tons-of-skills-marketplace
- Database Replication Manager Manage database replication, failover, and high availability configurations Plugin · jeremylongshore/tons-of-skills-marketplace
- Database Sharding Manager Database plugin for database-sharding-manager Plugin · jeremylongshore/tons-of-skills-marketplace
- Database Recovery Manager Database plugin for database-recovery-manager Plugin · jeremylongshore/tons-of-skills-marketplace