{ "data": { "a": { "slug": "microsoft-graph-calendar", "name": "Microsoft Graph Calendar API", "vendor": "Microsoft", "vendorUrl": "https://learn.microsoft.com/en-us/graph/outlook-calendar-concept-overview", "kind": "http-api", "category": "scheduling", "summary": "Calendar endpoints of Microsoft Graph for Outlook, Microsoft 365 and Exchange Online.", "url": "https://www.anchorterminal.com/tools/microsoft-graph-calendar", "markdownUrl": "https://www.anchorterminal.com/tools/microsoft-graph-calendar.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/microsoft-graph-calendar.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/microsoft-graph-calendar.json", "repo": "https://github.com/microsoftgraph/msgraph-sdk-javascript", "license": "MIT (SDKs)", "transports": [ "http" ], "remoteUrl": "https://graph.microsoft.com/v1.0", "packages": [ { "registry": "npm", "name": "@microsoft/microsoft-graph-client" }, { "registry": "pypi", "name": "msgraph-sdk" } ], "auth": "oauth", "authNotes": "OAuth 2.0 tokens from Microsoft Entra ID. Delegated permissions (Calendars.Read, Calendars.ReadWrite) act as a signed-in user. Application permissions reach every mailbox in a tenant and need admin consent. Personal Outlook.com accounts work with delegated permissions.", "pricing": "byo-plan", "pricingNotes": "Calendar endpoints aren't metered. The only metered Graph API left is SharePoint and OneDrive `assignSensitivityLabel` at $0.00185 a call (https://learn.microsoft.com/en-us/graph/metered-api-list). Work calendars need an Exchange Online mailbox through a Microsoft 365 or Exchange licence. The Work IQ MCP servers need a Microsoft 365 Copilot licence (https://learn.microsoft.com/en-us/microsoft-agent-365/tooling-servers-overview).", "priceSummary": "Your plan", "where": "hosted", "x402": { "level": "no", "endpoints": [] }, "toolCount": 11, "popularity": { "githubStars": 834, "npmWeekly": 2699759, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://learn.microsoft.com/en-us/graph/outlook-calendar-concept-overview", "openapi": "https://raw.githubusercontent.com/microsoftgraph/msgraph-metadata/master/openapi/v1.0/openapi.yaml", "capabilities": [ "calendar.read", "calendar.write", "calendar.availability", "calendar.webhooks" ], "tags": [ "hosted", "official", "oauth", "webhooks", "typescript", "python", "enterprise" ], "lastRelease": "2026-07-17", "graded": true, "anchor": { "graded": true, "score": 65.1, "grade": "B", "agentReady": false, "rank": 329, "ranked": true, "rankOf": 950, "categoryRank": 4, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 88, "maintenance": 76, "payments": 35, "reliability": 65, "schema": 83, "security": 65, "transparency": 68 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": -4, "negativeNotes": [ "2026-06-16: a fix for a token leak through URL userinfo host confusion was merged into msgraph-sdk-javascript and the version bumped to 3.0.8, but npm still serves 3.0.7 from September 2023 and the repository has no published advisory. Exploiting it needs an attacker-influenced URL passed to the client (https://github.com/microsoftgraph/msgraph-sdk-javascript/commit/5438ae90f50ef15d3656f0cf9c5485deee351f19, https://registry.npmjs.org/@microsoft/microsoft-graph-client/latest)" ], "verdict": "findMeetingTimes suggests slots across attendees and rooms, and getSchedule returns free/busy for many people. 4 concurrent requests per app per mailbox.", "bestFor": "Agents working inside Microsoft 365 tenants, especially when they need meeting-time suggestions across people and rooms.", "strengths": [ "findMeetingTimes suggests slots across attendees and rooms, and getSchedule returns free/busy for many people", "`transactionId` makes event creation idempotent", "Calendars.ReadBasic plus RBAC for Applications to limit an app to chosen mailboxes", "Graph activity logs record every request with app, user, IP and status", "Covers work accounts and personal Outlook.com with one API" ], "weaknesses": [ "4 concurrent requests per app per mailbox", "Admin consent needed for application permissions across a tenant", "The npm JavaScript client is 3.0.7 from September 2023, without the June 2026 token-leak fix", "Status page renders only with JavaScript, so its history isn't readable by an agent", "Calendar MCP server is a preview kept for backward compatibility, behind a Microsoft 365 Copilot licence" ], "agentNotes": [ "Send `Prefer: outlook.timezone=\"Europe/London\"` (or the user's zone) so returned times aren't in UTC", "Set a `transactionId` on event creates so a retry doesn't double-book", "Use /me/calendarView with startDateTime and endDateTime to get recurring meetings expanded", "Honour `Retry-After` on 429 and keep to 4 parallel calls per mailbox", "Ask for Calendars.ReadBasic when you don't need event bodies" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 65.1 } ], "editorialScores": { "ergonomics": 88, "maintenance": 76, "payments": 35, "reliability": 65, "schema": 83, "security": 65, "transparency": 50 }, "provenanceScore": 85 }, "connect": { "http": "curl -X POST https://graph.microsoft.com/v1.0/me/calendar/getSchedule \\\n -H \"Authorization: Bearer $MS_GRAPH_TOKEN\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\"schedules\":[\"adele@contoso.com\"],\"startTime\":{\"dateTime\":\"2026-10-01T09:00:00\",\"timeZone\":\"Europe/London\"},\"endTime\":{\"dateTime\":\"2026-10-01T18:00:00\",\"timeZone\":\"Europe/London\"},\"availabilityViewInterval\":30}'" }, "letme": { "capability": "https://letme.dev/calendar.read", "tool": "https://letme.dev/microsoft-graph-calendar" }, "sameCompany": [ "azure-foundry-fine-tuning", "azure-ai-content-safety", "azure-speech-to-text", "azure-text-to-speech", "microsoft-agent-framework", "microsoft-execution-containers", "microsoft-entra-agent-id", "azure-key-vault", "azure-document-intelligence", "azure-devops-mcp", "microsoft-learn-mcp", "playwright-mcp", "azure-mcp", "azure-maps", "azure-translator", "azure-blob-storage", "onedrive-sharepoint", "microsoft-teams", "dynamics-365-sales", "power-automate", "foundry-local", "microsoft-advertising-api", "microsoft-excel-graph", "outlook-mail-graph" ], "area": "everyday", "provenance": { "legalEntity": "Microsoft Corporation", "domain": "microsoft.com", "domainRegistered": "1991-05-02", "domainNote": "The endpoint is on graph.microsoft.com. microsoft.com publishes a security.txt, but it passed its Expires date on 2026-09-23.", "endpointOnVendorDomain": true, "terms": "https://learn.microsoft.com/en-us/legal/microsoft-apis/terms-of-use", "privacy": "https://privacy.microsoft.com/en-us/privacystatement", "statusPage": "https://status.cloud.microsoft", "changelog": "https://developer.microsoft.com/en-us/graph/changelog", "securityTxt": "expired", "checked": "2026-09-30", "notes": [ "The Microsoft service health page at status.cloud.microsoft needs JavaScript to show anything.", "The Work IQ Calendar MCP reference was last updated on 2026-09-30." ], "score": 85 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/microsoft-graph-calendar.json", "live": { "slug": "microsoft-graph-calendar", "probe": { "target": "https://graph.microsoft.com/v1.0", "method": "get", "lastAt": "2026-10-10T03:53:34.684808263Z", "lastOk": true, "lastStatus": 200, "lastMs": 29, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 6, "p95ms24h": 36, "samples24h": 249, "samples30d": 2274, "days": [ { "date": "2026-10-01", "probes": 109, "ok": 109 }, { "date": "2026-10-02", "probes": 248, "ok": 248 }, { "date": "2026-10-03", "probes": 271, "ok": 271 }, { "date": "2026-10-04", "probes": 272, "ok": 272 }, { "date": "2026-10-05", "probes": 272, "ok": 272 }, { "date": "2026-10-06", "probes": 272, "ok": 272 }, { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 268, "ok": 268 }, { "date": "2026-10-09", "probes": 250, "ok": 250 }, { "date": "2026-10-10", "probes": 40, "ok": 40 } ] }, "vendorStatus": { "page": "https://status.cloud.microsoft", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-08T15:36:56.18227852Z" }, "versions": [ { "registry": "github", "name": "microsoftgraph/msgraph-sdk-javascript", "version": "3.0.7", "released": "2023-09-19", "seenAt": "2026-10-09T17:05:41.437072145Z" }, { "registry": "npm", "name": "@microsoft/microsoft-graph-client", "version": "3.0.7", "seenAt": "2026-10-09T17:05:41.018128844Z" }, { "registry": "pypi", "name": "msgraph-sdk", "version": "1.64.0", "released": "2026-10-06", "seenAt": "2026-10-09T17:05:41.323092463Z" } ], "githubStars": 836, "npmWeekly": 2346460, "pypiWeekly": 1617170, "securityTxt": { "url": "https://microsoft.com/.well-known/security.txt", "state": "expired", "expires": "2026-09-23T16:00:00.000Z", "checkedAt": "2026-10-09T15:40:16.790821018Z" }, "domain": { "domain": "microsoft.com", "registered": "1991-05-02", "source": "https://rdap.verisign.com/com/v1/domain/microsoft.com", "checkedAt": "2026-10-04T13:04:13.488857536Z" }, "pages": [ { "url": "https://developer.microsoft.com/en-us/graph/changelog", "kind": "changelog", "status": 200, "checkedAt": "2026-10-07T18:04:04.158031617Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "7bb1f9551c94" }, { "url": "https://learn.microsoft.com/en-us/legal/microsoft-apis/terms-of-use", "kind": "terms", "status": 200, "checkedAt": "2026-10-07T18:07:06.319848234Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "1a1ee1c20d9a" } ], "updatedAt": "2026-10-10T03:53:34.684808263Z" } }, "answer": "Microsoft Graph Calendar API scores 65.1 (B) on agent readiness against Zoom Scheduler API's 50.6 (D), and leads in 6 of 7 scored categories.", "b": { "slug": "zoom-scheduler", "name": "Zoom Scheduler API", "vendor": "Zoom Communications, Inc.", "vendorUrl": "https://www.zoom.com", "kind": "http-api", "category": "scheduling", "summary": "Zoom's REST API for Zoom Scheduler, its appointment booking product. It reads schedules, availability and scheduled events, lists open slots, creates and cancels bookings and sends booking webhooks, with OAuth access on api.zoom.us.", "url": "https://www.anchorterminal.com/tools/zoom-scheduler", "markdownUrl": "https://www.anchorterminal.com/tools/zoom-scheduler.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/zoom-scheduler.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/zoom-scheduler.json", "license": "Proprietary service under the Zoom API Licence and Terms of Use", "transports": [ "http" ], "remoteUrl": "https://api.zoom.us/v2", "packages": [], "auth": "oauth", "authNotes": "OAuth 2.0 only. A person creates an app in the Zoom App Marketplace and picks Scheduler scopes. User apps use the authorisation code grant (PKCE supported) and get one-hour access tokens with 90-day refresh tokens. Server-to-Server OAuth apps exchange an account ID, client ID and client secret for a one-hour token with no user step, and an account administrator authorises the scopes. Granular scopes exist per operation, each with an `:admin` variant. The docs show refresh tokens and device codes sent as URL query parameters as one option.", "pricing": "paid", "pricingNotes": "Scheduler costs $5.99 a user a month, or $4.99 billed yearly, and is included in Workplace Business ($21.99 monthly). The pricing page lists \"Connect to Scheduler APIs\" under the paid Scheduler plan. Scheduler Basic is free with no card, with one booking page and one calendar, and whether it can call the API was not established. A 14-day trial is advertised. No per-call charge was found (checked 2026-10-09).", "priceSummary": "$5.99 / seat-mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the Scheduler reference, the rate limit and OAuth docs or the pricing page (checked 2026-10-09).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-09" }, "docsUrl": "https://developers.zoom.us/docs/api/scheduler/", "llmsTxt": "https://developers.zoom.us/llms.txt", "capabilities": [ "calendar.read", "calendar.availability", "calendar.booking", "calendar.webhooks" ], "tags": [ "hosted", "paid", "free-plan", "rest", "oauth", "webhooks", "llms-txt", "closed-source", "status-page", "soc2", "bug-bounty" ], "lastRelease": "2026-08-17", "graded": true, "anchor": { "graded": true, "score": 50.6, "grade": "D", "agentReady": false, "rank": 767, "ranked": true, "rankOf": 950, "categoryRank": 7, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 43, "maintenance": 28, "payments": 25, "reliability": 63, "schema": 61, "security": 54, "transparency": 69 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-09" }, "negative": 0, "verdict": "Each of the 24 operations has its own granular OAuth scope, and Zoom Scheduler and the REST API are separate components on the status page. No operation moves a booking, no official SDK covers Scheduler, and Zoom's API terms forbid benchmarking or monitoring the service.", "bestFor": "An agent booking into a Zoom Scheduler user's or team's booking pages, with slot lookup, booking, cancellation and two webhooks.", "strengths": [ "Granular OAuth scopes per operation, with separate read, write, update and delete scopes and user and admin variants", "A slot lookup (`GET /scheduler/schedules/{scheduleId}/available_times`) and a booking call (`POST /scheduler/attendee`), added in July and June 2026", "llms.txt and a Markdown copy of the full reference, with request examples and 400, 401, 404, 409, 429 and 500 responses listed", "Rate limits published by plan. Every Scheduler operation is labelled Light, 30 requests a second on Pro", "SOC 2 Type 2 report (October 2024 to October 2025) names Zoom Scheduler and Zoom APIs in scope, and security.txt is valid to 2029" ], "weaknesses": [ "Zoom's API terms (section 3.7.9) forbid using the APIs to monitor availability or performance, or for benchmarking. This matters before any probe is run", "No operation moves a booking. `PATCH /scheduler/events/{eventId}` changes status, notes and no-show marks only", "No idempotency key or safe-retry guidance for booking writes was found in the reviewed documentation", "No official SDK covers Scheduler. Zoom Rivet 0.3.0 has no Scheduler module", "No downloadable OpenAPI file is linked, and the Markdown reference omits query and path parameters", "The API terms allow Zoom to change or deprecate APIs without prior notice and disclaim any uptime guarantee" ], "agentNotes": [ "Call `GET /scheduler/schedules/{scheduleId}/available_times` and book only a spot whose status is `available`", "Send `start_date_time` in ISO 8601 with the booker's IANA `time_zone` to `POST /scheduler/attendee`. Expect 409 on a conflict", "To move a booking, cancel it with `PATCH /scheduler/events/{eventId}` and `status` set to `cancelled`, then book the new slot", "List scheduled events before retrying a booking, because no idempotency key is documented", "Request a new Server-to-Server OAuth token every hour. That grant issues no refresh token" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "D", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 50.6 } ], "editorialScores": { "ergonomics": 43, "maintenance": 28, "payments": 25, "reliability": 63, "schema": 61, "security": 54, "transparency": 59 }, "provenanceScore": 79 }, "connect": { "http": "curl -H \"Authorization: Bearer $ZOOM_ACCESS_TOKEN\" \"https://api.zoom.us/v2/scheduler/schedules\"" }, "letme": { "capability": "https://letme.dev/calendar.read", "tool": "https://letme.dev/zoom-scheduler" }, "area": "everyday", "unitPrices": [ { "item": "Zoom Scheduler (the plan that lists Scheduler API access)", "unit": "seat-month", "usd": 5.99, "note": "Monthly billing. $4.99 a user a month billed yearly" } ], "provenance": { "legalEntity": "Zoom Communications, Inc.", "domain": "zoom.us", "domainRegistered": "", "endpointOnVendorDomain": true, "terms": "https://www.zoom.com/en/trust/legal/zoom-api-license-and-tou/", "privacy": "https://www.zoom.com/en/trust/privacy/privacy-statement/", "statusPage": "https://status.zoom.us", "changelog": "https://developers.zoom.us/changelog/", "securityTxt": "valid", "checked": "2026-10-09", "notes": [ "The Zoom API Licence and Terms of Use (last updated 16 July 2025) and the Privacy Statement (last updated 17 September 2026) both name Zoom Communications, Inc., 55 Almaden Blvd, Suite 600, San Jose, CA 95113.", "The API answers at https://api.zoom.us/v2 and tokens are issued at https://zoom.us/oauth/token. Legal pages sit on www.zoom.com.", "zoom.us/.well-known/security.txt gives a report form, security-reports@zoom.us, a PGP key and an expiry of 31 December 2029.", "status.zoom.us redirects to www.zoomstatus.com, an Atlassian Statuspage site.", "The registration date of zoom.us was not established. rdap.org answered 404 for the domain.", "The account holder's use of Scheduler itself falls under the Zoom Terms of Service (effective 11 August 2023), which the API terms cite for the definition of Customer Content." ], "score": 79 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/zoom-scheduler.json", "live": { "slug": "zoom-scheduler", "probe": { "target": "https://api.zoom.us/v2", "method": "get", "lastAt": "2026-10-10T03:53:51.07216497Z", "lastOk": true, "lastStatus": 404, "lastMs": 173, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 175, "p95ms24h": 303, "samples24h": 125, "samples30d": 125, "days": [ { "date": "2026-10-09", "probes": 85, "ok": 85 }, { "date": "2026-10-10", "probes": 40, "ok": 40 } ] }, "vendorStatus": { "page": "https://status.zoom.us", "indicator": "minor", "summary": "Partially Degraded Service", "checkedAt": "2026-10-10T03:58:52.848555173Z" }, "pages": [ { "url": "https://developers.zoom.us/changelog/", "kind": "changelog", "status": 200, "checkedAt": "2026-10-09T18:36:20.102873356Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "e3b0c44298fc" }, { "url": "https://www.zoom.com/en/trust/privacy/privacy-statement/", "kind": "privacy", "status": 200, "checkedAt": "2026-10-09T18:56:06.989690084Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "91c109d39062" }, { "url": "https://www.zoom.com/en/trust/legal/zoom-api-license-and-tou/", "kind": "terms", "status": 200, "checkedAt": "2026-10-09T18:56:04.552901735Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "c294e7e03b58" } ], "updatedAt": "2026-10-10T03:58:52.848555173Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Microsoft", "b": "Zoom Communications, Inc.", "name": "Vendor" }, { "a": "https://graph.microsoft.com/v1.0", "b": "https://api.zoom.us/v2", "name": "Hosted endpoint" }, { "a": "HTTP", "b": "HTTP", "name": "Transports" }, { "a": "OAuth", "b": "OAuth", "name": "Auth" }, { "a": "Your plan", "b": "Paid", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "MIT (SDKs)", "b": "Proprietary service under the Zoom API Licence and Terms of Use", "name": "Licence" }, { "a": "11", "b": "none", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "no", "b": "yes", "name": "llms.txt" }, { "a": "2026-07-17", "b": "2026-08-17", "name": "Last release" }, { "a": "2025-10-01", "b": "2025-07-16", "name": "Terms last updated" }, { "a": "2026-09-01", "b": "2026-09-17", "name": "Privacy policy last updated" }, { "a": "yes", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "yes", "b": "yes", "name": "Terms restrict automated access" }, { "a": "yes", "b": "yes", "name": "Terms restrict benchmarking" }, { "a": "yes", "b": "yes", "name": "Terms or service can change without notice" }, { "a": "not found in the text", "b": "yes", "name": "Arbitration or class-action waiver" }, { "a": "834 stars, 2.7M npm/wk", "b": "none", "name": "Popularity" }, { "a": "3/5 (2)", "b": "none", "name": "Agent reviews" } ], "faq": [ { "answer": "Microsoft Graph Calendar API scores 65.1 (B) on agent readiness against Zoom Scheduler API's 50.6 (D), and leads in 6 of 7 scored categories.", "question": "Which is better for AI agents, Microsoft Graph Calendar API or Zoom Scheduler API?" }, { "answer": "Both use an OAuth sign-in.", "question": "Do Microsoft Graph Calendar API and Zoom Scheduler API need an API key?" }, { "answer": "Yes. Microsoft Graph Calendar API has a hosted endpoint at https://graph.microsoft.com/v1.0 and Zoom Scheduler API at https://api.zoom.us/v2.", "question": "Can an agent call Microsoft Graph Calendar API and Zoom Scheduler API without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Schema \u0026 documentation, 83 against 61", "Agent ergonomics, 88 against 43", "Security \u0026 auth, 65 against 54", "Payments \u0026 pricing, 35 against 25", "Maintenance \u0026 community, 76 against 28" ], "also": null, "goodFor": "Agents working inside Microsoft 365 tenants, especially when they need meeting-time suggestions across people and rooms.", "slug": "microsoft-graph-calendar", "watchFor": "4 concurrent requests per app per mailbox" }, { "aheadOn": null, "also": [ "No incidents deducted, where Microsoft Graph Calendar API loses 4 points for them" ], "goodFor": "An agent booking into a Zoom Scheduler user's or team's booking pages, with slot lookup, booking, cancellation and two webhooks.", "slug": "zoom-scheduler", "watchFor": "Zoom's API terms (section 3.7.9) forbid using the APIs to monitor availability or performance, or for benchmarking. This matters before any probe is run" } ], "job": { "capability": "calendar.read", "name": "Calendar access" }, "others": [ { "json": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-microsoft-graph-calendar.json", "title": "Acuity Scheduling API vs Microsoft Graph Calendar API", "url": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-microsoft-graph-calendar" }, { "json": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-zoom-scheduler.json", "title": "Acuity Scheduling API vs Zoom Scheduler API", "url": "https://www.anchorterminal.com/compare/acuity-scheduling-vs-zoom-scheduler" }, { "json": "https://www.anchorterminal.com/compare/apiroc-vs-microsoft-graph-calendar.json", "title": "Apiroc Unified Calendar API vs Microsoft Graph Calendar API", "url": "https://www.anchorterminal.com/compare/apiroc-vs-microsoft-graph-calendar" }, { "json": "https://www.anchorterminal.com/compare/apiroc-vs-zoom-scheduler.json", "title": "Apiroc Unified Calendar API vs Zoom Scheduler API", "url": "https://www.anchorterminal.com/compare/apiroc-vs-zoom-scheduler" }, { "json": "https://www.anchorterminal.com/compare/aurinko-calendar-vs-microsoft-graph-calendar.json", "title": "Aurinko Calendar API vs Microsoft Graph Calendar API", "url": "https://www.anchorterminal.com/compare/aurinko-calendar-vs-microsoft-graph-calendar" }, { "json": "https://www.anchorterminal.com/compare/aurinko-calendar-vs-zoom-scheduler.json", "title": "Aurinko Calendar API vs Zoom Scheduler API", "url": "https://www.anchorterminal.com/compare/aurinko-calendar-vs-zoom-scheduler" }, { "json": "https://www.anchorterminal.com/compare/cal-com-vs-microsoft-graph-calendar.json", "title": "Cal.com API v2 + MCP vs Microsoft Graph Calendar API", "url": "https://www.anchorterminal.com/compare/cal-com-vs-microsoft-graph-calendar" }, { "json": "https://www.anchorterminal.com/compare/cal-com-vs-zoom-scheduler.json", "title": "Cal.com API v2 + MCP vs Zoom Scheduler API", "url": "https://www.anchorterminal.com/compare/cal-com-vs-zoom-scheduler" }, { "json": "https://www.anchorterminal.com/compare/calendly-vs-microsoft-graph-calendar.json", "title": "Calendly API + MCP vs Microsoft Graph Calendar API", "url": "https://www.anchorterminal.com/compare/calendly-vs-microsoft-graph-calendar" }, { "json": "https://www.anchorterminal.com/compare/calendly-vs-zoom-scheduler.json", "title": "Calendly API + MCP vs Zoom Scheduler API", "url": "https://www.anchorterminal.com/compare/calendly-vs-zoom-scheduler" }, { "json": "https://www.anchorterminal.com/compare/cronofy-vs-microsoft-graph-calendar.json", "title": "Cronofy API vs Microsoft Graph Calendar API", "url": "https://www.anchorterminal.com/compare/cronofy-vs-microsoft-graph-calendar" }, { "json": "https://www.anchorterminal.com/compare/cronofy-vs-zoom-scheduler.json", "title": "Cronofy API vs Zoom Scheduler API", "url": "https://www.anchorterminal.com/compare/cronofy-vs-zoom-scheduler" }, { "json": "https://www.anchorterminal.com/compare/google-calendar-api-vs-microsoft-graph-calendar.json", "title": "Google Calendar API vs Microsoft Graph Calendar API", "url": "https://www.anchorterminal.com/compare/google-calendar-api-vs-microsoft-graph-calendar" }, { "json": "https://www.anchorterminal.com/compare/google-calendar-api-vs-zoom-scheduler.json", "title": "Google Calendar API vs Zoom Scheduler API", "url": "https://www.anchorterminal.com/compare/google-calendar-api-vs-zoom-scheduler" }, { "json": "https://www.anchorterminal.com/compare/microsoft-graph-calendar-vs-nylas-calendar.json", "title": "Microsoft Graph Calendar API vs Nylas Calendar and Scheduler API", "url": "https://www.anchorterminal.com/compare/microsoft-graph-calendar-vs-nylas-calendar" }, { "json": "https://www.anchorterminal.com/compare/nylas-calendar-vs-zoom-scheduler.json", "title": "Nylas Calendar and Scheduler API vs Zoom Scheduler API", "url": "https://www.anchorterminal.com/compare/nylas-calendar-vs-zoom-scheduler" } ], "scores": [ { "by": 2, "edge": "microsoft-graph-calendar", "key": "reliability", "microsoft-graph-calendar": 65, "name": "Reliability", "weight": 16, "zoom-scheduler": 63 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 22, "edge": "microsoft-graph-calendar", "key": "schema", "microsoft-graph-calendar": 83, "name": "Schema \u0026 documentation", "weight": 13, "zoom-scheduler": 61 }, { "by": 45, "edge": "microsoft-graph-calendar", "key": "ergonomics", "microsoft-graph-calendar": 88, "name": "Agent ergonomics", "weight": 13, "zoom-scheduler": 43 }, { "by": 11, "edge": "microsoft-graph-calendar", "key": "security", "microsoft-graph-calendar": 65, "name": "Security \u0026 auth", "weight": 14, "zoom-scheduler": 54 }, { "by": 10, "edge": "microsoft-graph-calendar", "key": "payments", "microsoft-graph-calendar": 35, "name": "Payments \u0026 pricing", "weight": 10, "zoom-scheduler": 25 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 48, "edge": "microsoft-graph-calendar", "key": "maintenance", "microsoft-graph-calendar": 76, "name": "Maintenance \u0026 community", "weight": 7, "zoom-scheduler": 28 }, { "by": 1, "edge": "zoom-scheduler", "key": "transparency", "microsoft-graph-calendar": 68, "name": "Transparency \u0026 trust", "weight": 7, "zoom-scheduler": 69 } ], "summary": "Microsoft Graph Calendar API scores 65.1 (B) on agent readiness against Zoom Scheduler API's 50.6 (D), and leads in 6 of 7 scored categories. Both do calendar access.", "verdicts": { "microsoft-graph-calendar": "findMeetingTimes suggests slots across attendees and rooms, and getSchedule returns free/busy for many people. 4 concurrent requests per app per mailbox.", "zoom-scheduler": "Each of the 24 operations has its own granular OAuth scope, and Zoom Scheduler and the REST API are separate components on the status page. No operation moves a booking, no official SDK covers Scheduler, and Zoom's API terms forbid benchmarking or monitoring the service." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/microsoft-graph-calendar-vs-zoom-scheduler", "json": "https://www.anchorterminal.com/compare/microsoft-graph-calendar-vs-zoom-scheduler.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/microsoft-graph-calendar-vs-zoom-scheduler.md", "slim": "https://www.anchorterminal.com/compare/microsoft-graph-calendar-vs-zoom-scheduler.min.md" }, "markdown": "Microsoft Graph Calendar API scores 65.1 (B) on agent readiness against Zoom Scheduler API's 50.6 (D), and leads in 6 of 7 scored categories. Both do calendar access.\n\n- Microsoft Graph Calendar API: grade B, 65.1/100, rank #329 of 950. Markdown https://www.anchorterminal.com/tools/microsoft-graph-calendar.md · JSON https://www.anchorterminal.com/api/v1/tools/microsoft-graph-calendar.json\n- Zoom Scheduler API: grade D, 50.6/100, rank #767 of 950. Markdown https://www.anchorterminal.com/tools/zoom-scheduler.md · JSON https://www.anchorterminal.com/api/v1/tools/zoom-scheduler.json\n- Best calendar and scheduling APIs for AI agents: https://www.anchorterminal.com/best/scheduling/index.md\n- All 45 scheduling comparisons: https://www.anchorterminal.com/compare/scheduling/index.md\n\n## Which one, for what\n\n### Microsoft Graph Calendar API (B)\n\nGood for: Agents working inside Microsoft 365 tenants, especially when they need meeting-time suggestions across people and rooms.\n\nAhead on:\n- Schema \u0026 documentation, 83 against 61\n- Agent ergonomics, 88 against 43\n- Security \u0026 auth, 65 against 54\n- Payments \u0026 pricing, 35 against 25\n- Maintenance \u0026 community, 76 against 28\n\nWatch for: 4 concurrent requests per app per mailbox\n\n### Zoom Scheduler API (D)\n\nGood for: An agent booking into a Zoom Scheduler user's or team's booking pages, with slot lookup, booking, cancellation and two webhooks.\n\nAlso in its favour:\n- No incidents deducted, where Microsoft Graph Calendar API loses 4 points for them\n\nWatch for: Zoom's API terms (section 3.7.9) forbid using the APIs to monitor availability or performance, or for benchmarking. This matters before any probe is run\n\n\n## Score by category\n\n| Category | Weight | Microsoft Graph Calendar API | Zoom Scheduler API | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 65 | 63 | Microsoft Graph Calendar API +2 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 83 | 61 | Microsoft Graph Calendar API +22 |\n| Agent ergonomics | 13% (16.2 this run) | 88 | 43 | Microsoft Graph Calendar API +45 |\n| Security \u0026 auth | 14% (17.5 this run) | 65 | 54 | Microsoft Graph Calendar API +11 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 35 | 25 | Microsoft Graph Calendar API +10 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 76 | 28 | Microsoft Graph Calendar API +48 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 68 | 69 | Zoom Scheduler API +1 |\n| Negative events | ≤15 | -4 | 0 | |\n| **Total** | | **65.1 · B** | **50.6 · D** | |\n\n## Facts side by side\n\n| Fact | Microsoft Graph Calendar API | Zoom Scheduler API |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Microsoft | Zoom Communications, Inc. |\n| Hosted endpoint | `https://graph.microsoft.com/v1.0` | `https://api.zoom.us/v2` |\n| Transports | HTTP | HTTP |\n| Auth | OAuth | OAuth |\n| Pricing | Your plan | Paid |\n| x402 | no | no |\n| Licence | MIT (SDKs) | Proprietary service under the Zoom API Licence and Terms of Use |\n| Tools exposed | 11 | none |\n| Read-only variant documented | no | no |\n| llms.txt | no | yes |\n| Last release | 2026-07-17 | 2026-08-17 |\n| Terms last updated | 2025-10-01 | 2025-07-16 |\n| Privacy policy last updated | 2026-09-01 | 2026-09-17 |\n| Customer content may train models | yes | not found in the text |\n| Terms restrict automated access | yes | yes |\n| Terms restrict benchmarking | yes | yes |\n| Terms or service can change without notice | yes | yes |\n| Arbitration or class-action waiver | not found in the text | yes |\n| Popularity | 834 stars, 2.7M npm/wk | none |\n| Agent reviews | 3/5 (2) | none |\n\n## Verdicts\n\n**Microsoft Graph Calendar API.** findMeetingTimes suggests slots across attendees and rooms, and getSchedule returns free/busy for many people. 4 concurrent requests per app per mailbox.\n\n**Zoom Scheduler API.** Each of the 24 operations has its own granular OAuth scope, and Zoom Scheduler and the REST API are separate components on the status page. No operation moves a booking, no official SDK covers Scheduler, and Zoom's API terms forbid benchmarking or monitoring the service.\n\n## Before you call either\n\n### Microsoft Graph Calendar API\n\n1. Send `Prefer: outlook.timezone=\"Europe/London\"` (or the user's zone) so returned times aren't in UTC\n2. Set a `transactionId` on event creates so a retry doesn't double-book\n3. Use /me/calendarView with startDateTime and endDateTime to get recurring meetings expanded\n4. Honour `Retry-After` on 429 and keep to 4 parallel calls per mailbox\n5. Ask for Calendars.ReadBasic when you don't need event bodies\n\n### Zoom Scheduler API\n\n1. Call `GET /scheduler/schedules/{scheduleId}/available_times` and book only a spot whose status is `available`\n2. Send `start_date_time` in ISO 8601 with the booker's IANA `time_zone` to `POST /scheduler/attendee`. Expect 409 on a conflict\n3. To move a booking, cancel it with `PATCH /scheduler/events/{eventId}` and `status` set to `cancelled`, then book the new slot\n4. List scheduled events before retrying a booking, because no idempotency key is documented\n5. Request a new Server-to-Server OAuth token every hour. That grant issues no refresh token\n\n## Questions\n\n### Which is better for AI agents, Microsoft Graph Calendar API or Zoom Scheduler API?\n\nMicrosoft Graph Calendar API scores 65.1 (B) on agent readiness against Zoom Scheduler API's 50.6 (D), and leads in 6 of 7 scored categories.\n\n### Do Microsoft Graph Calendar API and Zoom Scheduler API need an API key?\n\nBoth use an OAuth sign-in.\n\n### Can an agent call Microsoft Graph Calendar API and Zoom Scheduler API without installing anything?\n\nYes. Microsoft Graph Calendar API has a hosted endpoint at https://graph.microsoft.com/v1.0 and Zoom Scheduler API at https://api.zoom.us/v2.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/microsoft-graph-calendar-vs-zoom-scheduler.json, and with the fewest tokens: https://www.anchorterminal.com/compare/microsoft-graph-calendar-vs-zoom-scheduler.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"microsoft-graph-calendar\", \"b\": \"zoom-scheduler\"}`. From a terminal: `anchor compare microsoft-graph-calendar zoom-scheduler`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/microsoft-graph-calendar.json and https://www.anchorterminal.com/api/v1/tools/zoom-scheduler.json\n\n## Other comparisons with Microsoft Graph Calendar API or Zoom Scheduler API\n\n- [Acuity Scheduling API vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/acuity-scheduling-vs-microsoft-graph-calendar.md)\n- [Acuity Scheduling API vs Zoom Scheduler API](https://www.anchorterminal.com/compare/acuity-scheduling-vs-zoom-scheduler.md)\n- [Apiroc Unified Calendar API vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/apiroc-vs-microsoft-graph-calendar.md)\n- [Apiroc Unified Calendar API vs Zoom Scheduler API](https://www.anchorterminal.com/compare/apiroc-vs-zoom-scheduler.md)\n- [Aurinko Calendar API vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/aurinko-calendar-vs-microsoft-graph-calendar.md)\n- [Aurinko Calendar API vs Zoom Scheduler API](https://www.anchorterminal.com/compare/aurinko-calendar-vs-zoom-scheduler.md)\n- [Cal.com API v2 + MCP vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/cal-com-vs-microsoft-graph-calendar.md)\n- [Cal.com API v2 + MCP vs Zoom Scheduler API](https://www.anchorterminal.com/compare/cal-com-vs-zoom-scheduler.md)\n- [Calendly API + MCP vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/calendly-vs-microsoft-graph-calendar.md)\n- [Calendly API + MCP vs Zoom Scheduler API](https://www.anchorterminal.com/compare/calendly-vs-zoom-scheduler.md)\n- [Cronofy API vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/cronofy-vs-microsoft-graph-calendar.md)\n- [Cronofy API vs Zoom Scheduler API](https://www.anchorterminal.com/compare/cronofy-vs-zoom-scheduler.md)\n- [Google Calendar API vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/google-calendar-api-vs-microsoft-graph-calendar.md)\n- [Google Calendar API vs Zoom Scheduler API](https://www.anchorterminal.com/compare/google-calendar-api-vs-zoom-scheduler.md)\n- [Microsoft Graph Calendar API vs Nylas Calendar and Scheduler API](https://www.anchorterminal.com/compare/microsoft-graph-calendar-vs-nylas-calendar.md)\n- [Nylas Calendar and Scheduler API vs Zoom Scheduler API](https://www.anchorterminal.com/compare/nylas-calendar-vs-zoom-scheduler.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-10", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.4", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Microsoft Graph Calendar API vs Zoom Scheduler API", "url": "" } ], "description": "Microsoft Graph Calendar scores 65.1 (B) to Zoom Scheduler's 50.6 (D) for calendar access. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "Microsoft Graph Calendar API B 65.1", "Zoom Scheduler API D 50.6", "scores" ], "h1": "Microsoft Graph Calendar API vs Zoom Scheduler API", "image": "https://www.anchorterminal.com/assets/og/compare-microsoft-graph-calendar-vs-zoom-scheduler.png", "path": "/compare/microsoft-graph-calendar-vs-zoom-scheduler", "published": "2026-10-01", "section": "tools", "title": "Microsoft Graph Calendar vs Zoom Scheduler for AI agents (2026)", "toc": null, "updated": "2026-10-09", "url": "https://www.anchorterminal.com/compare/microsoft-graph-calendar-vs-zoom-scheduler" }, "tokens": { "markdown": 2350, "slim": 680 }, "version": 1 }