crystal

Crystal Ruby-like syntax with static typing. Use for .cr files.

7 stars

byG1Joshi

View on GitHub Installation ↓

Best use case

crystal is best used when you need a repeatable AI agent workflow instead of a one-off prompt.

Crystal Ruby-like syntax with static typing. Use for .cr files.

Teams using crystal should expect a more consistent output, faster repeated execution, less prompt rewriting.

When to use this skill

You want a reusable workflow that can be run more than once with consistent structure.

When not to use this skill

You only need a quick one-off answer and do not need a reusable workflow.
You cannot install or maintain the underlying files, dependencies, or repository context.

Installation

Claude Code / Cursor / Codex

$curl -o ~/.claude/skills/crystal/SKILL.md --create-dirs "https://raw.githubusercontent.com/G1Joshi/Agent-Skills/main/skills/languages/crystal/SKILL.md"

Manual Installation

Download SKILL.md from GitHub
Place it in .claude/skills/crystal/SKILL.md inside your project
Restart your AI agent — it will auto-discover the skill

How crystal Compares

Feature / Agent	crystal	Standard Approach
Platform Support	Not specified	Limited / Varies
Context Awareness	High	Baseline
Installation Complexity	Unknown	N/A

Frequently Asked Questions

What does this skill do?

Crystal Ruby-like syntax with static typing. Use for .cr files.

Where can I find the source code?

You can find the source code on GitHub using the link provided at the top of the page.

SKILL.md Source

# Crystal

Crystal compiles to native code (using LLVM) but looks exactly like Ruby. v1.12 continues improving **Windows support** and parallelism.

## When to Use

- **Performance sensitive Rubyists**: Porting heavy Ruby scripts to Crystal for 50x speedup.
- **Microservices**: Low memory footprint compared to JVM/Ruby.
- **CLI Tools**: Fast startup and execution.

## Core Concepts

### Fibers

Lightweight concurrency (like Go routines). `spawn { ... }`.

### Macros

Generate code at compile time (like Zig/Lisp).

### Union Types

`String | Int32`. The compiler handles the branching.

## Best Practices (2025)

**Do**:

- **Use strict types in APIs**: Help the compiler with `def foo(x : Int32)`.
- **Use `shards`**: Dependency manager.
- **Use `-Dpreview_mt`**: To test multithreading capabilities.

**Don't**:

- **Don't use `eval`**: Crystal is compiled, there is no runtime eval.

## References

- [Crystal Lang](https://crystal-lang.org/)