The Snyk Language Server (Snyk-LS) is an implementation of the Language Server Protocol that integrates vulnerability scanning capabilities from Snyk into development environments. It uses the Snyk CLI as a data provider for Snyk Open Source (OSS) and Snyk Infrastructure as Code (IaC), while connecting directly to the Snyk Code API for Snyk Code analysis. The server follows LSP, offering diagnostics when a document is opened or folders are part of the workspace, performing folder startup scans, and enabling workspace scans on demand. Diagnostics are cached to improve performance and can be invalidated on document saves to retrieve fresh results. It provides precise range calculations to highlight issues, rich hover information with diagnostic details and links, and progress reporting for long-running background tasks. It supports in-editor actions such as Code Lenses and Code Actions, and handles authentication with OAuth2 or token-based methods, including browser opening and clipboard support. The server can automatically download and manage the Snyk CLI if not present, and supports selective activation of products. It communicates with clients via MCP extensions for folder config, server URL, and scan notifications.