---
name: ruby-bindings-patterns
description: "Instructions for ruby bindings patterns."
---
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## priority: high
# Ruby Bindings Patterns
**Role**: Ruby bindings for Rust core. Work on Magnus bridge and Ruby gem packages.
**Scope**: Magnus FFI, Ruby-idiomatic API, RSpec tests.
**Commands**: bundle install, bundle exec rake compile/rubocop/rspec.
**Critical**: Core logic lives in Rust. Ruby only for bindings/wrappers. If core logic needed, coordinate with Rust team.
## Ruby 3.2+ Standards (RBS & Steep)
- Ruby 3.2+ with .ruby-version file; rbenv for version management
- RBS files in sig/ directory parallel to source: lib/foo.rb -> sig/foo.rbs
- Steep for type checking; avoid Any types, use union and optional types explicitly
- RSpec for testing: describe/context/it blocks, 80%+ coverage, function-like tests
- Rubocop with auto-fix: line length \<=120, prefer &:method_name blocks
- Naming: PascalCase (classes), snake_case (methods), SCREAMING_SNAKE_CASE (constants)
- Code quality: methods \<10 lines, guard clauses, modules for mixins, Dry::Struct for value objects
- CI: rubocop --format progress, steep check, rspec with simplecov
