List all available Microsoft Graph API resource categories with descriptions and load status. Categories: users (Azure AD/Entra ID), files (OneDrive/SharePoint drives), mail (Exchange Online), calendar (Outlook), groups (M365/security groups), notes (OneNote), tasks (Planner/To Do), sites (SharePoint sites and lists), subscriptions (webhooks/change notifications).

Activate Graph API tools for a resource category. Call this as soon as the user's intent is clear — do not wait for confirmation. Categories: 'users' (Azure AD/Entra ID user management), 'mail' (Exchange Online messages/folders), 'calendar' (Outlook events/scheduling), 'files' (OneDrive uploads/downloads/folders), 'sites' (SharePoint sites/lists/items), 'groups' (M365 and security groups), 'notes' (OneNote notebooks/pages), 'tasks' (Planner plans/tasks and To Do), 'subscriptions' (webhooks/change notifications). Multiple categories can be loaded — load all relevant ones when the task spans areas.

Search Microsoft Graph REST API endpoints by keyword. Covers SharePoint sites and lists, OneDrive files, Exchange Online mail, Outlook calendar, Azure AD users, Microsoft 365 groups, Teams, Planner, OneNote, To Do, and webhook subscriptions.

Explain how Microsoft Graph API pagination works with @odata.nextLink, and how to iterate all pages of results.

Explain OData query parameters supported by Microsoft Graph: $filter, $select, $expand, $orderby, $top, $count, $search.

Explain Microsoft Graph throttling: what causes 429 errors, how to handle Retry-After, and service-specific limits.

Explain Microsoft Graph delta queries for efficient change tracking — get only changed items since last sync rather than fetching everything.

Explain Microsoft Graph JSON batching — combine up to 20 API requests into a single HTTP call to reduce round trips.

Explain Microsoft Graph permission types — delegated vs application, how to register an app, and least-privilege best practices.

Build a Microsoft Graph JSON batch request body — combine up to 20 API calls into a single POST to /$batch.

Explain common Microsoft Graph API error codes and how to fix them — 401, 403, 404, 429, 503, and Graph-specific error codes like InvalidAuthenticationToken, Forbidden, and ItemNotFound.