The Ada Language Server (ALS) is a Language Server Protocol implementation providing IDE features for Ada and SPARK programming languages. It consists of a core server written in Ada that handles language intelligence features (completion, diagnostics, refactoring, etc.) and a VS Code extension written in TypeScript that integrates with the editor. The architecture follows a client-server model where the language server communicates with editor clients via JSON-RPC. Key components include the Ada-based LSP server implementing standard LSP capabilities plus Ada-specific extensions, the VS Code extension providing editor integration, and a comprehensive test suite validating LSP compliance. The project shows active maintenance with regular commits, clear build systems, and dependency management through Alire.