Combines Ruby's native Coverage execution counts with Prism AST analysis to map per-test coverage onto semantic units (methods, branches, conditions), find redundant tests grouped by duplication type with confidence levels, and emit a removal patch — never deleting a test that would open a coverage gap. Report + patch only; asks for approval before any change.

TNG (Test Next Generation) is a Rails gem that automatically generates comprehensive test files by analyzing your Ruby code using static analysis and AI. It supports models, controllers, and services with intelligent test case generation.

A mountable Rails engine that provides a beautiful web interface for viewing and understanding your Rails logs. Groups requests with their SQL queries and view renders, with real-time updates.

Assert state changes through multiple values for an object, enabling you to test complex state transitions in sequence with RSpec.

typespec_from_serializers helps you by automatically generating TypeSpec descriptions for your JSON serializers, allowing you typecheck your frontend code to ship fast and with confidence.

Enable verbose logging for Active Record migrations, regardless of configured log level. Monitor query speed, query execution, and overall progress when executing long running or otherwise risky migrations.

CLI tool to generate test files with Cloude 3.

Verity is a Ruby test framework built around a core principle: tests are executable data structures, not a nested DSL. Each test carries structured metadata (tags, timeout, resource declarations) used for CI filtering, parallel grouping, and scheduling. Execution uses process-level forking with a SQLite manifest as the work queue and result store.

why-classes is a linter and refactoring tool inspired by Dave Thomas's talk on the over-use of classes in Ruby. It scans a Ruby/Rails codebase (or a single file) for "class smells" -- stateless singleton-method classes, function buckets, invalid initial state, fat-base inheritance, and data buckets -- and reports each one with a concrete refactoring suggestion toward modules, composition, Struct or Data. The mechanically-safe refactorings (notably data bucket -> Struct/Data) can be applied automatically with --fix.

Woods extracts structured data from Rails applications for use in AI-assisted development tooling. It provides version-specific context by running inside Rails to leverage runtime introspection, inlining concerns, mapping routes to controllers, and indexing the exact Rails/gem source versions in use.

Convert YARD documentation into RBS files

YRuby is a Ruby virtual machine implementation based on CRuby's YARV (Yet Another Ruby VM) architecture. It parses Ruby source code with the Prism gem and executes it through a stack-based bytecode interpreter.