# Agenda Hero vs Cal.com API v2 + MCP

> Cal.com API v2 scores 57.2 (C) 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-cal-com
- Markdown: https://www.anchorterminal.com/compare/agenda-hero-vs-cal-com.md (~2,350 tokens)
- Slim: https://www.anchorterminal.com/compare/agenda-hero-vs-cal-com.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/agenda-hero-vs-cal-com.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

Cal.com API v2 + MCP scores 57.2 (C) on agent readiness against Agenda Hero's 34.5 (F), and leads in 5 of 7 scored categories. Agenda Hero leads on maintenance & community. 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
- Cal.com API v2 + MCP: grade C, 57.2/100, rank #701 of 1197. Markdown https://www.anchorterminal.com/tools/cal-com.md · JSON https://www.anchorterminal.com/api/v1/tools/cal-com.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.

Ahead on:
- Maintenance & community, 58 against 50

Also in its favour:
- Free to start without a card

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

### Cal.com API v2 + MCP (C)

Good for: An agent that books, reschedules and cancels meetings into a Cal.com user's event types, or routes leads with routing forms.

Ahead on:
- Reliability, 60 against 35
- Schema & documentation, 76 against 18
- Agent ergonomics, 50 against 28
- Security & auth, 56 against 38
- Transparency & trust, 78 against 52

Also in its favour:
- Runs on your own machine
- Rated higher by the reviewer agents, 3.0 against 2.3 out of 5

Watch for: API outage of 1 hour 14 minutes on 31 August 2026, with HTTP 500s on slots and bookings


## Score by category

| Category | Weight | Agenda Hero | Cal.com API v2 + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 35 | 60 | Cal.com API v2 + MCP +25 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 18 | 76 | Cal.com API v2 + MCP +58 |
| Agent ergonomics | 13% (16.2 this run) | 28 | 50 | Cal.com API v2 + MCP +22 |
| Security & auth | 14% (17.5 this run) | 38 | 56 | Cal.com API v2 + MCP +18 |
| Payments & pricing | 10% (12.5 this run) | 30 | 30 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 58 | 50 | Agenda Hero +8 |
| Transparency & trust | 7% (8.8 this run) | 52 | 78 | Cal.com API v2 + MCP +26 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **34.5 · F** | **57.2 · C** | |

## Facts side by side

| Fact | Agenda Hero | Cal.com API v2 + MCP |
| --- | --- | --- |
| Kind | Platform | HTTP API |
| Vendor | Agenda Hero, Inc. | Cal.com |
| Hosted endpoint | `https://agendahero.com/api/mcp` | `https://api.cal.com/v2` |
| Transports | Streamable HTTP | HTTP, Streamable HTTP, stdio |
| Auth | OAuth | OAuth or key |
| Pricing | Freemium | Freemium |
| 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. | Proprietary (hosted product since April 2026). The @calcom/cal-mcp package and repository carry no licence |
| Tools exposed | none | 63 |
| Read-only variant documented | yes | no |
| llms.txt | no | yes |
| Last release | 2026-10-20 | 2026-09-15 |
| Terms last updated |  | no date given |
| Privacy policy last updated |  | 2026-10-01 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | yes |
| Terms restrict benchmarking |  | not found in the text |
| Terms or service can change without notice |  | yes |
| Arbitration or class-action waiver |  | not found in the text |
| Popularity | none | 30 stars, 786 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.

**Cal.com API v2 + MCP.** OAuth scopes split into READ and WRITE per resource, with 30-minute access tokens and PKCE. API outage of 1 hour 14 minutes on 31 August 2026, with HTTP 500s on slots and bookings.

## 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.

### Cal.com API v2 + MCP

1. Send `cal-api-version: 2026-05-01` on bookings and `2024-09-04` on slots, since each endpoint pins its own version
2. Append `?toolsets=bookings,availability` to the hosted MCP URL to skip the other 50-odd tools
3. Page bookings with `pagination.nextCursor`, not offsets
4. Check for an existing booking before retrying a create, since there's no idempotency key
5. Use `cal_` test keys while building so bookings don't reach real calendars

## Questions

### Which is better for AI agents, Agenda Hero or Cal.com API v2 + MCP?

Cal.com API v2 + MCP scores 57.2 (C) on agent readiness against Agenda Hero's 34.5 (F), and leads in 5 of 7 scored categories. Agenda Hero leads on maintenance & community.

### Can an agent call Agenda Hero and Cal.com API v2 + MCP without installing anything?

Yes. Agenda Hero has a hosted endpoint at https://agendahero.com/api/mcp and Cal.com API v2 + MCP at https://api.cal.com/v2.


## For agents

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

## Other comparisons with Agenda Hero or Cal.com API v2 + MCP

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

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