Individual skill

rust-trait-api-design

Design and review Rust trait APIs, generic bounds, dispatch models, and conversion contracts for clear public interfaces. Use when designing, refactoring, or reviewing traits, generics, trait objects, associated types, impl Trait, From/TryFrom, AsRef, Borrow, or crate APIs.

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Repository stars (not skill ratings): 1,531
Repository last updated: Nov 6, 2026
License: Apache-2.0

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# Rust Trait API Design

Use this skill to make Rust APIs generic where useful, concrete where simpler,
and object-safe when dynamic dispatch is part of the design. Optimize for the
smallest capability contract that callers and implementors can understand.

## Core Workflow

1. Identify whether the API consumes, borrows, returns, stores, or dispatches
   behavior.
2. Start with concrete types for local code. Generalize only when at least two
   callers or implementations need the flexibility.
3. Use generic bounds for compile-time polymorphism and inlining. Use `dyn
   Trait` for heterogeneous values, plugin-like extension points, or runtime