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Rust design patterns for RTK. Newtype, Builder, RAII, Trait Objects, State Machine. Applied to CLI filter modules. Use when designing new modules or…
RTK Rust Design Patterns
Patterns that apply to RTK's filter module architecture. Focused on CLI tool patterns, not web/service patterns.
Pattern 1: Newtype (Type Safety)
Use when: wrapping primitive types to prevent misuse (command names, paths, token counts).
// Without Newtype — easy to mix up
fn track(input_tokens: usize, output_tokens: usize) { ... }
track(output_tokens, input_tokens); // Silent bug!
// With Newtype — compile error on swap
pub struct InputTokens(pub usize);
pub struct OutputTokens(pub usize);
fn track(input: InputTokens, output: OutputTokens) { ... }
track(OutputTokens(100), InputTokens(400)); // Compile error ✅don't have the plugin yet? install it then click "run inline in claude" again.