Notion MCP Server is a modular MCP server that exposes the Notion API to large language models, enabling seamless interaction with Notion workspaces via Claude Desktop. It authenticates with NOTION_API_TOKEN and can optionally enable experimental Markdown conversion to reduce token usage. The server comprises a client wrapper for Notion API calls, a Claude-facing MCP server, type definitions, utilities, and a markdown converter. It ships a broad tool suite covering blocks, pages, databases, users, and search (e.g., notion_retrieve_page, notion_update_page_properties, notion_query_database, notion_create_comment, notion_retrieve_comments, notion_retrieve_user, etc.). Markdown conversion returns responses as Markdown when format is 'markdown' and NOTION_MARKDOWN_CONVERSION is true, otherwise JSON; this trade-off preserves readability but may affect editing of page content. Configuration is done via claude_desktop_config.json, with two runtime options: using npx to fetch @suekou/mcp-notion-server or running a built file via node. The project is modular and designed to support flexible Notion-based LLM workflows.