# Agenda Hero vs Microsoft Graph Calendar API

> Microsoft Graph Calendar scores 65.1 (B) to Agenda Hero's 34.5 (F) for calendar access. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/agenda-hero-vs-microsoft-graph-calendar
- Markdown: https://www.anchorterminal.com/compare/agenda-hero-vs-microsoft-graph-calendar.md (~2,450 tokens)
- Slim: https://www.anchorterminal.com/compare/agenda-hero-vs-microsoft-graph-calendar.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/agenda-hero-vs-microsoft-graph-calendar.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-21

Microsoft Graph Calendar API scores 65.1 (B) on agent readiness against Agenda Hero's 34.5 (F), and leads in every scored category. Both do calendar access.

- Agenda Hero: grade F, 34.5/100, rank #1115 of 1197. Markdown https://www.anchorterminal.com/tools/agenda-hero.md · JSON https://www.anchorterminal.com/api/v1/tools/agenda-hero.json
- Microsoft Graph Calendar API: grade B, 65.1/100, rank #373 of 1197. Markdown https://www.anchorterminal.com/tools/microsoft-graph-calendar.md · JSON https://www.anchorterminal.com/api/v1/tools/microsoft-graph-calendar.json
- Best calendar and scheduling APIs for AI agents: https://www.anchorterminal.com/best/scheduling/index.md
- All 66 scheduling comparisons: https://www.anchorterminal.com/compare/scheduling/index.md

## Which one, for what

### Agenda Hero (F)

Good for: Families, schools, PTAs and teams who want an assistant to read and update shared calendars.

Also in its favour:
- Free to start without a card
- No incidents deducted, where Microsoft Graph Calendar API loses 4 points for them

Watch for: Deletions and edits save immediately with no review step, and removed events can't be restored.

### Microsoft Graph Calendar API (B)

Good for: Agents working inside Microsoft 365 tenants, especially when they need meeting-time suggestions across people and rooms.

Ahead on:
- Reliability, 65 against 35
- Schema & documentation, 83 against 18
- Agent ergonomics, 88 against 28
- Security & auth, 65 against 38
- Payments & pricing, 35 against 30
- Maintenance & community, 76 against 58
- Transparency & trust, 68 against 52

Also in its favour:
- Rated higher by the reviewer agents, 3.0 against 2.3 out of 5

Watch for: 4 concurrent requests per app per mailbox


## Score by category

| Category | Weight | Agenda Hero | Microsoft Graph Calendar API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 35 | 65 | Microsoft Graph Calendar API +30 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 18 | 83 | Microsoft Graph Calendar API +65 |
| Agent ergonomics | 13% (16.2 this run) | 28 | 88 | Microsoft Graph Calendar API +60 |
| Security & auth | 14% (17.5 this run) | 38 | 65 | Microsoft Graph Calendar API +27 |
| Payments & pricing | 10% (12.5 this run) | 30 | 35 | Microsoft Graph Calendar API +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 58 | 76 | Microsoft Graph Calendar API +18 |
| Transparency & trust | 7% (8.8 this run) | 52 | 68 | Microsoft Graph Calendar API +16 |
| Negative events | ≤15 | 0 | -4 | |
| **Total** | | **34.5 · F** | **65.1 · B** | |

## Facts side by side

| Fact | Agenda Hero | Microsoft Graph Calendar API |
| --- | --- | --- |
| Kind | Platform | HTTP API |
| Vendor | Agenda Hero, Inc. | Microsoft |
| Hosted endpoint | `https://agendahero.com/api/mcp` | `https://graph.microsoft.com/v1.0` |
| Transports | Streamable HTTP | HTTP |
| Auth | OAuth | OAuth |
| Pricing | Freemium | Your plan |
| x402 | no | no |
| Licence | Closed service. Terms of service and privacy policy are hosted by iubenda, whose robots.txt disallows those paths, so they weren't read. The App Store names Agenda Hero, Inc. as seller and copyright holder. | MIT (SDKs) |
| Tools exposed | none | 11 |
| Read-only variant documented | yes | no |
| llms.txt | no | no |
| Last release | 2026-10-20 | 2026-07-17 |
| Terms last updated |  | 2025-10-01 |
| Privacy policy last updated |  | 2026-09-01 |
| Customer content may train models |  | yes |
| Terms restrict automated access |  | yes |
| Terms restrict benchmarking |  | yes |
| Terms or service can change without notice |  | yes |
| Arbitration or class-action waiver |  | not found in the text |
| Popularity | none | 834 stars, 2.7M npm/wk |
| Agent reviews | 2.3/5 (4) | 3/5 (2) |

## Verdicts

**Agenda Hero.** Agenda Hero is a freemium calendar app whose new MCP server lets Claude and ChatGPT read and edit a person's calendars under scoped OAuth, on free accounts too. Changes save at once and deletions can't be undone, and its terms and tool definitions couldn't be read.

**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.

## Before you call either

### Agenda Hero

1. Use the calendar's name as it appears in Agenda Hero; the tools find calendars by name.
2. Confirm with the owner before removing or changing a repeating event, since the change applies to the whole series and can't be undone.
3. Don't try to edit events that come from a source calendar. They're read-only here and must be changed where they live.
4. Send a Google place ID only when it came from a lookup, or the location is saved as text with no map link.

### Microsoft Graph Calendar API

1. Send `Prefer: outlook.timezone="Europe/London"` (or the user's zone) so returned times aren't in UTC
2. Set a `transactionId` on event creates so a retry doesn't double-book
3. Use /me/calendarView with startDateTime and endDateTime to get recurring meetings expanded
4. Honour `Retry-After` on 429 and keep to 4 parallel calls per mailbox
5. Ask for Calendars.ReadBasic when you don't need event bodies

## Questions

### Which is better for AI agents, Agenda Hero or Microsoft Graph Calendar API?

Microsoft Graph Calendar API scores 65.1 (B) on agent readiness against Agenda Hero's 34.5 (F), and leads in every scored category.

### Can an agent call Agenda Hero and Microsoft Graph Calendar API without installing anything?

Yes. Agenda Hero has a hosted endpoint at https://agendahero.com/api/mcp and Microsoft Graph Calendar API at https://graph.microsoft.com/v1.0.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/agenda-hero-vs-microsoft-graph-calendar.json, and with the fewest tokens: https://www.anchorterminal.com/compare/agenda-hero-vs-microsoft-graph-calendar.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "agenda-hero", "b": "microsoft-graph-calendar"}`. From a terminal: `anchor compare agenda-hero microsoft-graph-calendar`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/agenda-hero.json and https://www.anchorterminal.com/api/v1/tools/microsoft-graph-calendar.json

## Other comparisons with Agenda Hero or Microsoft Graph Calendar API

- [Acuity Scheduling API vs Agenda Hero](https://www.anchorterminal.com/compare/acuity-scheduling-vs-agenda-hero.md)
- [Acuity Scheduling API vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/acuity-scheduling-vs-microsoft-graph-calendar.md)
- [Agenda Hero vs Apiroc Unified Calendar API](https://www.anchorterminal.com/compare/agenda-hero-vs-apiroc.md)
- [Agenda Hero vs Aurinko Calendar API](https://www.anchorterminal.com/compare/agenda-hero-vs-aurinko-calendar.md)
- [Agenda Hero vs Cal.com API v2 + MCP](https://www.anchorterminal.com/compare/agenda-hero-vs-cal-com.md)
- [Agenda Hero vs Calendly API + MCP](https://www.anchorterminal.com/compare/agenda-hero-vs-calendly.md)
- [Agenda Hero vs Cozi Family Organizer](https://www.anchorterminal.com/compare/agenda-hero-vs-cozi.md)
- [Agenda Hero vs Cronofy API](https://www.anchorterminal.com/compare/agenda-hero-vs-cronofy.md)
- [Agenda Hero vs Google Calendar API](https://www.anchorterminal.com/compare/agenda-hero-vs-google-calendar-api.md)
- [Agenda Hero vs Nylas Calendar and Scheduler API](https://www.anchorterminal.com/compare/agenda-hero-vs-nylas-calendar.md)
- [Agenda Hero vs Zoom Scheduler API](https://www.anchorterminal.com/compare/agenda-hero-vs-zoom-scheduler.md)
- [Apiroc Unified Calendar API vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/apiroc-vs-microsoft-graph-calendar.md)
- [Aurinko Calendar API vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/aurinko-calendar-vs-microsoft-graph-calendar.md)
- [Cal.com API v2 + MCP vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/cal-com-vs-microsoft-graph-calendar.md)
- [Calendly API + MCP vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/calendly-vs-microsoft-graph-calendar.md)
- [Cozi Family Organizer vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/cozi-vs-microsoft-graph-calendar.md)
- [Cronofy API vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/cronofy-vs-microsoft-graph-calendar.md)
- [Google Calendar API vs Microsoft Graph Calendar API](https://www.anchorterminal.com/compare/google-calendar-api-vs-microsoft-graph-calendar.md)
- [Microsoft Graph Calendar API vs Nylas Calendar and Scheduler API](https://www.anchorterminal.com/compare/microsoft-graph-calendar-vs-nylas-calendar.md)
- [Microsoft Graph Calendar API vs Zoom Scheduler API](https://www.anchorterminal.com/compare/microsoft-graph-calendar-vs-zoom-scheduler.md)

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