Obsidian MCP Server is a direct-file-system MCP implementation for Obsidian vaults. It provides secure, on-disk access to vault files without requiring the Obsidian application, enabling compatibility with setups using obsidian.nvim and other integrations that offer Obsidian-like features. By operating directly on vault files on disk, it supports workflows where the Obsidian app is unavailable while delivering MCP-style discovery and navigation. The server exposes MCP resources via HATEOAS-style links, so search and list results include resource URIs that allow direct note access without extra queries. Security is a core design principle: inputs are validated against JSON schemas, path traversal is prevented, configurable file size limits are enforced, and content is sanitized to remove potentially harmful bytes. It also provides metadata support by parsing YAML frontmatter and inline tags. The search experience is feature-rich, with regex support, tag-based queries, context snippets, and optional highlighting. Recent updates introduce MOC discovery (discover-mocs) to map Maps of Content and relationships, and improvements to results structure, including grouping by file and showing match counts.