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Community MCPCommunity-maintainedPublishes llms.txt

Cal.com MCP Server

Works today — the question is whether it still will next quarter.

The self-hosted alternative to Calendly, and reportedly the last major scheduler still local-only. Strong API, no first-party hosted MCP endpoint.

Email & Calendar
3/5

Agent-readiness

Workable overall

Weighted across four pillars

Reach3
Cost5
Control3
Trust2
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What an agent can do here

Open-source scheduling — self-hostable and API-first, but agent access still runs through locally hosted community MCP servers.

Action depth
Core write

Agents can do the product’s core job — edit the timeline, ship the deploy, update the record.

Hosting
Self-run

You run the server process yourself.

Auth
API key
Unattended
Headless-capable

A long-lived token works, so this can run on a schedule.

Blast radius
Medium

Mistakes are recoverable but visible.

Permission scoping: All or nothing

What it costs to let an agent act

FreeUnmetered

Free and self-hostable (AGPL); cal.com cloud has a free individual tier. No per-call metering when you host it.

How the score breaks down

Every factor below is scored by a fixed rubric, not by opinion — so two tools with the same shape always get the same number.

Reach

Workable3/5

Can an agent actually do the job?

  • MCP serverCommunity-built1/2
  • Action depthCore write1/1.5
  • HostingSelf-run0.5/1
  • Fallback pathPublic API0.5/0.5

Cost

Excellent5/5

What does it cost to let the agent act?

  • Plan requiredFree3/3
  • Usage meteringUnmetered2/2

Control

Workable3/5

Can I let it run unattended?

  • Permission scopingAll or nothing0/1.5
  • Unattended authHeadless-capable1.5/1.5
  • Blast radiusMedium1/1.5
  • Auth frictionAPI key0.5/0.5

Trust

Limited2/5

Will this still work next month?

  • MaintainerCommunity1/2
  • MaturityCommunity-maintained0.5/1.5
  • Research confidenceLow0/1
  • FreshnessVerified 43d ago0.5/0.5

Cal.com vs other email & calendar tools

Sorted by overall score. Cal.com alternatives → Filter and sort the full category →

Email & Calendar MCP servers compared
ToolOverallReachCostControlTrustCost to actCan doRisk
CalendlyExcellentOne of the few schedulers that chose a hosted remote server — no local process, standard OAuth, and it works before you pay.
4.5
4.5
5
4
4.5
FreeUnmeteredCore writeHeadlessMediumblast radius
LoopsGoodHosted, write-capable and simple — but agent writes here touch your contact list and can trigger campaigns to real people.
4
4.5
4
2.5
4.5
FreeUsage-meteredCore writeHeadlessHighblast radius
ResendGoodWrite action here means mail leaving your domain, irreversibly. Excellent server; use a sending-only key and a test domain first.
4
4
4
2.5
5
FreeUsage-meteredCore writeHeadlessHighblast radius
Google WorkspaceGoodHighest-value, highest-blast-radius connection in the directory: an agent that can read your mail and write your docs. The Google Cloud setup is the price of admission, and no llms.txt anywhere.
4
4
5
2
4.5
FreeUnmeteredCore writeNeeds a humanHighblast radius
Cal.comWorkableThe self-hosted alternative to Calendly, and reportedly the last major scheduler still local-only. Strong API, no first-party hosted MCP endpoint.
3
3
5
3
2
FreeUnmeteredCore writeHeadlessMediumblast radius
Microsoft 365 (Outlook)LimitedThe enterprise mirror image of Google Workspace, with more gates: no dedicated first-party Outlook MCP server confirmed, and nothing happens without an admin.
2
2.5
2.5
0.5
2
EnterpriseUnmeteredShallow writeNeeds a humanHighblast radius

Cal.com MCP FAQ

Does Cal.com have an MCP server?

Not an official one. Cal.com is reachable through a community-maintained MCP server (community-maintained), which means no vendor guarantee that it keeps pace with the product's API.

Is the Cal.com MCP server free?

Yes — no paid plan is required before an agent can act. Free and self-hostable (AGPL); cal.com cloud has a free individual tier. No per-call metering when you host it.

Can an AI agent make changes in Cal.com?

Yes. Agents get core write access to Cal.com — they can do the product's main job, not just read.

How does an agent authenticate with Cal.com?

API key. A long-lived credential works, so it can run unattended in scheduled jobs and CI.

Which AI agents work with the Cal.com MCP server?

Verified with Claude, Cursor, Windsurf.

What are the best Cal.com MCP alternatives?

By agent-readiness score in the same category: Calendly, Loops, Resend.

Maintain Cal.com? Show the score

Add the live agent-readiness badge to your README or docs. It updates whenever the listing is re-verified.

Cal.com on MCP Index

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How we know

Last verified
2026-09-29 · 43d ago
Research confidence
low
Maturity
Community-maintained

NEEDS VERIFICATION: no first-party Cal.com MCP doc page resolved during probing; confirm whether an official server exists before publishing.

Spotted something wrong? Send a correction — vendor corrections are applied first.

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