microsoft graph api resource access via mcp protocol
Exposes Microsoft 365 resources (users, groups, mail, calendar, files, teams) through the Model Context Protocol by implementing MCP server endpoints that translate client requests into authenticated Graph API calls. Uses OAuth 2.0 client credentials or delegated auth flows to obtain tokens, then marshals HTTP requests to Microsoft's REST endpoints and transforms JSON responses back through MCP's tool/resource interface.
Unique: Implements MCP server pattern specifically for Graph API, translating MCP's tool/resource abstraction directly to Graph's OData query model and batch operations, enabling LLMs to compose complex M365 workflows without direct API knowledge
vs alternatives: Provides native MCP integration for M365 (vs. generic REST API wrappers), allowing Claude and other MCP clients to access Office 365 with standardized tool calling rather than custom API client libraries
email reading and composition with mailbox context
Implements MCP tools to list, read, and compose emails by wrapping Graph API's /me/messages, /me/mailFolders, and /me/sendMail endpoints. Supports filtering by folder, sender, date range, and subject via OData query parameters; retrieves message bodies in both plain text and HTML; handles attachments as metadata references. Composition creates draft messages with recipients, subject, body, and attachment references before sending.
Unique: Exposes Exchange Online mailbox operations through MCP's tool interface with OData filtering support, allowing LLMs to compose natural-language email queries (e.g., 'unread emails from my manager this week') that map to efficient Graph API filters
vs alternatives: Simpler than building custom IMAP/SMTP clients; leverages Graph API's native filtering and pagination, avoiding the complexity of MIME parsing and IMAP protocol state management
calendar event querying and meeting management
Provides MCP tools to list, read, and create calendar events by calling Graph API's /me/calendarview, /me/events, and /me/events POST endpoints. Supports time-range queries via startDateTime/endDateTime parameters, retrieves event details (title, time, attendees, location, body), and creates new events with attendee lists and reminders. Handles recurring events and timezone conversions via IANA timezone identifiers.
Unique: Wraps Graph API's calendarview endpoint with timezone-aware time range queries, enabling LLMs to ask natural questions about availability ('am I free next Tuesday 2-3pm?') that translate to efficient Graph API calls with proper timezone handling
vs alternatives: More flexible than CalDAV clients for querying; Graph API's calendarview endpoint is optimized for range queries and attendee expansion, avoiding the need to parse iCalendar objects or manage subscription state
onedrive and sharepoint file access with path-based navigation
Implements MCP tools to list, read metadata, and retrieve file contents from OneDrive and SharePoint via Graph API's /me/drive, /drives/{driveId}/items, and /sites/{siteId}/drive endpoints. Supports hierarchical path navigation, file search by name/type, and retrieval of file metadata (size, modified date, sharing status). File contents are returned as base64-encoded data or text previews depending on file type.
Unique: Provides path-based file navigation through Graph API's item hierarchy, allowing LLMs to traverse OneDrive/SharePoint like a filesystem while leveraging Graph's native metadata and sharing APIs
vs alternatives: Simpler than WebDAV or direct SharePoint REST calls; Graph API abstracts away site/drive ID complexity and provides unified interface for both OneDrive and SharePoint
user and group directory querying with azure ad integration
Exposes MCP tools to query Azure AD users and groups via Graph API's /users, /groups, and /me/memberOf endpoints. Supports filtering by display name, email, job title, department, and group membership; retrieves user profiles (name, email, phone, office location, manager) and group details (members, owners, description). Implements pagination for large result sets using Graph API's skipToken mechanism.
Unique: Provides OData-filtered directory queries through MCP, enabling LLMs to compose natural-language people searches ('find all engineers in the sales department') that map to efficient Graph API filter expressions
vs alternatives: More efficient than LDAP queries for cloud-native Azure AD; Graph API's OData filtering is optimized for directory searches and includes modern attributes (manager, department) without LDAP schema complexity
teams and channel message access with conversation threading
Implements MCP tools to list Teams, channels, and messages via Graph API's /teams, /teams/{teamId}/channels, and /teams/{teamId}/channels/{channelId}/messages endpoints. Supports message filtering by date range and sender, retrieves message threads with replies, and accesses channel metadata (description, topic, members). Messages include sender info, timestamps, and reply counts for conversation context.
Unique: Exposes Teams channel messages through MCP with conversation threading support, allowing LLMs to retrieve message context and replies without manually navigating Teams UI or managing conversation state
vs alternatives: Simpler than Teams SDK for message retrieval; Graph API abstracts away Teams client complexity and provides unified REST interface for both channel and chat access
mcp server lifecycle management and tool registration
Implements the MCP server protocol by registering tools and resources with the MCP client, handling request/response serialization, and managing server initialization. Uses Node.js event emitters to handle incoming tool calls, validates request parameters against defined schemas, and returns structured responses. Manages OAuth token lifecycle (refresh, expiry handling) and connection state between MCP client and Graph API.
Unique: Implements full MCP server lifecycle including tool registration, request routing, and OAuth token management, providing a complete bridge between MCP clients and Graph API without requiring custom protocol implementation
vs alternatives: Eliminates need to build custom MCP server from scratch; provides pre-built tool definitions and Graph API integration patterns that would otherwise require significant engineering effort