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API Design

API design is the practice of defining the contract between a service and its consumers in a way that is consistent, predictable, and resilient to change. A well-designed API reduces integration friction, makes versioning safe, and communicates intent through naming and structure rather than documentation alone. This skill covers the three dominant paradigms - REST, GraphQL, and gRPC - along with OpenAPI specs, pagination strategies, versioning, error formats, and authentication patterns.

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