cgo conventions for linking Go to a C or Rust static library: import "C" directives, type/string conversion, CString memory management, thread safety, and Go pointer pinning. Load when generating or reviewing cgo bindings that call a C or Rust core from Go.

C# code conventions covering .NET 8+/C# 12, nullable reference types, Roslyn analyzers, xUnit, record types, async/await discipline, and dependency security. Load when writing or reviewing C# code.

Elixir code conventions covering Elixir 1.14+/OTP 25+, pattern matching, mix format, Credo/Dialyzer, ExUnit, ExDoc, OTP process patterns, and dependency security. Load when writing or reviewing Elixir code.

extendr conventions for exposing a Rust core to R: extendr macros and module registration, Robj type mapping, NA handling, rextendr builds, R package scaffolding, and CRAN compliance. Load when generating or reviewing extendr R bindings for a Rust library.

Assists with frontend development

Go code conventions covering Effective Go, error wrapping, golangci-lint, govulncheck, table-driven tests, interfaces, context usage, modules, and concurrency. Load when writing or reviewing Go code.

Assists with Go development tasks

Build in verified increments rather than one speculative block: smallest viable change first, verify, then extend; prototype the risky part before committing to a design; batch edits to one file into a single operation. Load when planning a large or multi-file change, when uncertain which of several approaches will work, or when tempted to generate a whole subsystem before running anything.

Java code conventions covering Java 17+ records and sealed classes, formatting/static analysis, Maven/Gradle, JUnit 5, exception handling, constructor injection, streams, and security. Load when writing or reviewing Java code.

Magnus conventions for building Ruby native extensions from a Rust core: define_class, TryConvert/IntoValue, exception mapping, GVL handling, TypedData GC integration, and rake-compiler distribution. Load when generating or reviewing Magnus Ruby bindings for a Rust library.

napi-rs conventions for exposing a Rust core to Node.js: #[napi] macros, napi::Error mapping, auto-generated .d.ts types, async Promises, and CommonJS/ESM output. Load when generating or reviewing napi-rs Node.js bindings for a Rust library.

Python code conventions covering type hints, Ruff formatting/linting, mypy/pyright, pytest, async I/O, uv packaging, and dependency security scanning. Load when writing or reviewing Python code.

R code conventions covering R 4.1+, tidyverse/base style, styler/lintr, roxygen2, testthat, error handling, input validation, C/C++/Rust interop, and CRAN compliance. Load when writing or reviewing R code.

Ruby code conventions covering Ruby 3.2+, RuboCop, RBS type checking, RSpec/Minitest, security scanning, exception handling, composition, Bundler, and gem packaging. Load when writing or reviewing Ruby code.

Rustler conventions for building Elixir NIFs from a Rust core: nif macros, tagged {:ok,_}/{:error,_} tuples, dirty schedulers, ResourceArc state, NifStruct derives, and mix compile. Load when generating or reviewing Rustler Elixir NIF bindings for a Rust library.

vite+ unified TypeScript toolchain conventions: the vp CLI for package/node management, oxlint/oxfmt, type-aware linting, vitest, rolldown/tsdown bundling, task caching, and migration. Load when configuring or reviewing a vite+ TypeScript toolchain.