Accelerate Ruby on Rails app development by generating idiomatic code for Hotwire, GraphQL, background jobs, state machines, admin panels; performing DHH-style reviews, performance audits, data integrity checks; writing RSpec/Minitest; optimizing PostgreSQL/SQLite queries; deploying via Kamal/Docker; researching/building gems—all powered by 50 specialized skills, agents, commands.
Based on adoption, maintenance, documentation, and repository signals. Not a security audit or endorsement.
Database operations, backups, monitoring, connection pooling, and maintenance for PostgreSQL/SQLite in Rails production.
Optimize database queries, write complex SQL, interpret EXPLAIN ANALYZE, and design index strategies for PostgreSQL/SQLite in Rails.
Use proactively for researching Ruby gems, evaluating gem quality, checking maintenance status, finding alternatives, and providing implementation guidance for Ruby dependencies.
Orchestrate Rails code reviews by selecting appropriate specialized skills based on changed files, loading project topics, and synthesizing results into prioritized findings.
Orchestrate data integrity review by applying specialized skills for migrations, constraints, transactions, and privacy.
Implement state machines with AASM for workflow management. Covers state transitions, guards, callbacks, and testing.
Use when creating or refactoring Action Mailer emails. Applies Rails 7.1+ conventions, parameterized mailers, preview workflows, background delivery, and email design best practices.
Use proactively for authorization with ActionPolicy. Creates policies, scopes, and integrates with GraphQL/ActionCable. Preferred over Pundit for composable, cacheable authorization.
Implement typed business operations with ActiveInteraction. Covers input types, composition, controller patterns, and testing.
Use when creating or refactoring Active Job background jobs. Applies Rails 8 conventions, Solid Queue patterns, error handling, retry strategies, and job design best practices.
Uses power tools
Uses Bash, Write, or Edit tools
The Majestic marketplace where we share our workflows.
New here? Check out the Marketplace Tutorial for an interactive walkthrough.
Coding is no longer the bottleneck. Planning, review, and learning loops matter more than syntax. Each feature makes the next one easier to build.
| Step | What Happens | Key Tools |
|---|---|---|
| Plan | Agents research codebase + best practices, produce detailed implementation plans | /majestic:plan, architect agent |
| Work | Agents write code, tests, and iterate using real app feedback | /majestic:build-task, coder skills |
| Assess | Multi-angle review: security, performance, simplicity, conventions | /majestic:code-review, quality-gate |
| Reflect | Analyze session patterns, capture lessons so future agents improve | /majestic-tools:insight:reflect, /majestic:add-lesson |
See the Workflow Guide for detailed documentation.
Run the installer:
curl -fsSL https://raw.githubusercontent.com/majesticlabs-dev/majestic-marketplace/master/install.sh | bash
This gives you options to:
Run claude and add the marketplace:
/plugin marketplace add https://github.com/majesticlabs-dev/majestic-marketplace.git
Then install a plugin:
/plugin install {plugin-name}
Export Majestic plugins to OpenCode or Codex with schema-aware conversion:
./scripts/install-codex.sh
# Install all plugins
./scripts/install-codex.sh --all
# Install all plugins to OpenCode
./scripts/install-opencode.sh --all
# Install specific plugins
./scripts/install-codex.sh engineer rails tools
# Example (explicit): convert engineer, rails, and tools to OpenCode
# Output target: ~/.config/opencode
./scripts/install-opencode.sh engineer rails tools
# Install one plugin (short or prefixed)
./scripts/install-codex.sh engineer
./scripts/install-codex.sh majestic-tools
Both commands are now local to this repository and only require Ruby (scripts/convert-plugin.rb).
This runs a converter pipeline (not a plain file copy), so incompatible Claude metadata is translated for target formats.
disable-model-invocation frontmatter is preserved as part of source metadata parsing, but it does not exclude a command from conversion for OpenCode/Codex output.
Output locations:
~/.codex/skills/ and ~/.codex/prompts/~/.config/opencode (opencode.json, agents/, skills/, plugins/)Limitations: Codex still does not support some Claude Code features (Task, hooks, some MCP integrations), so behavior is reduced there.
| Plugin | Description |
|---|---|
| majestic-engineer | Language-agnostic engineering workflows (17 agents, 8 commands, 12 skills) |
| majestic-rails | Ruby on Rails development tools (23 agents, 5 commands, 9 skills) |
| majestic-react | Modern React development with TypeScript (3 agents, 1 command, 4 skills) |
| majestic-python | Python development tools (2 agents) |
| majestic-devops | Infrastructure-as-Code and DevOps workflows (1 agent, 8 skills) |
| majestic-llm | External LLM integration - Codex, Gemini (5 agents, 1 command) |
| majestic-marketing | Marketing and SEO tools (14 agents, 2 commands, 24 skills) |
| majestic-sales | Sales acceleration tools (1 command, 6 skills) |
| majestic-company | Business operations and CEO tools (2 agents, 21 skills) |
| majestic-experts | Expert panel discussion system (2 agents, 1 command) |
| majestic-tools | Claude Code customization tools (10 commands, 3 skills) |
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Verify ownership to unlock analytics, metadata editing, and a verified badge. GitHub access is read-only (username + org membership).
Sign in to claimOwn this plugin?
Verify ownership to unlock analytics, metadata editing, and a verified badge. GitHub access is read-only (username + org membership).
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