Paperclip is a Rust toolkit for working with OpenAPI specifications. It provides code generation for type-safe HTTP clients and servers from OpenAPI v2/v3 specs, procedural macros to derive OpenAPI annotations from Rust code, and an Actix-web plugin for serving generated specs and integrating with handlers. The architecture is modular with separate crates for core types, macros, Actix integration, and CLI tools. Key features include reference resolution with cycle detection, emitter-based code generation strategy, builder patterns with compile-time field validation, and macro-driven spec generation. The project is actively maintained with recent commits, CI workflows, and frequent version updates.