CalendarMCP

CalendarMCP provides a hosted Google Calendar MCP (Machine-Callable Procedure) service designed for AI agents. It offers free start-up access, scoped API keys, and a set of calendar tools such as list, create, update, and delete events. The platform includes agent‑readable docs, human documentation, pricing, and integration guides, enabling agents to manage calendars without handling Google credentials directly.

CalendarMCP is listed with 2 APIs on the APIs.io network. Tagged areas include Calendar, Artificial Intelligence, MCP, Google Calendar, and Integration.

The CalendarMCP catalog on APIs.io includes 1 Spectral governance ruleset.

CalendarMCP’s developer surface includes changelog, authentication, documentation, API reference, pricing, engineering blog, support, and 13 more developer resources.

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20.4/100 emerging Agent 19/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessSelf serve

2 APIs 1 MCP Servers

Calendar Artificial Intelligence MCPGoogle CalendarIntegration

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 20.4/100 · emerging

Contract Quality 2.5 / 21

Developer Ergonomics 4.0 / 17

Access Clarity 2.7 / 17

Operational Transparency 0.9 / 11

Contract Governance 2.2 / 10

Discoverability 4.5 / 9

Regulatory Posture 2.9 / 15

Agent readiness — 19/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

10 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 11.6 — up to +22.1 composite points
Access Clarity scores 15.8 — up to +16.8 composite points
Developer Ergonomics scores 23.8 — up to +15.2 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/calendarmcp-ai/apis.yml: open an issue on github.com/api-evangelist/calendarmcp-ai to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

APIs 2

Individual APIs this provider publishes, each with its own machine-readable definition.

Calendar MCP API

API for Calendar MCP service, documented at https://calendarmcp.ai/api/docs

CalendarMCP API

CalendarMCP API as documented publicly: 1 operations. Contract generated from the documentation by API Evangelist (2026-11-03); not the provider's own document.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

CalendarMCP MCP Server

Remote MCP server at calendarmcp.ai requiring an API key.

MCP SERVER

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

CalendarMCP API Rules

27 rules · 25 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Calendarmcp Ai Authentication

2 schemes

SECURITY

Calendarmcp Ai Domain Security

TLSv1.3 · HSTS

SECURITY

Resources

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

MCPServer

MCPServer

WellKnown

WellKnown

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Spectral

Vocabulary

Conventions

Conformance

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

ChangeLog

ChangeLog

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: calendarmcp-ai
name: CalendarMCP
description: CalendarMCP provides a hosted Google Calendar MCP (Machine-Callable Procedure) service designed for AI agents.
  It offers free start-up access, scoped API keys, and a set of calendar tools such as list, create, update, and delete events.
  The platform includes agent‑readable docs, human documentation, pricing, and integration guides, enabling agents to manage
  calendars without handling Google credentials directly.
url: https://artifacts.apis.io/calendarmcp-ai/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-03 (modular-v1; was harvest)
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Self-serve signup
  confidence: low
  probe_state: unreadable
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.20'
created: '2026-11-03'
modified: '2026-11-03'
tags:
- Calendar
- Artificial Intelligence
- MCP
- Google Calendar
- Integration
tags_raw:
- Calendar
- AI
- MCP
- Google Calendar
- Integration
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/calendarmcp-ai-rules.yml
- type: Vocabulary
  url: vocabulary/calendarmcp-ai-vocabulary.yml
- type: ChangeLog
  url: changelog/calendarmcp-ai-changelog.yml
- type: Conventions
  url: conventions/calendarmcp-ai-conventions.yml
- type: Authentication
  url: authentication/calendarmcp-ai-authentication.yml
- type: Conformance
  url: conformance/calendarmcp-ai-conformance.yml
- type: MCPServer
  url: mcp/calendarmcp-ai-mcp.yml
- type: WellKnown
  url: well-known/calendarmcp-ai-well-known.yml
- type: Hosts
  url: hosts/calendarmcp-ai-hosts.yml
- type: Vendors
  url: vendors/calendarmcp-ai-vendors.yml
- type: ChangeLog
  url: https://calendarmcp.ai/changelog
- type: DomainSecurity
  url: security/calendarmcp-ai-domain-security.yml
- type: Website
  url: https://calendarmcp.ai/
- type: Documentation
  url: https://calendarmcp.ai/docs
- type: APIReference
  url: https://calendarmcp.ai/api/docs
- type: Pricing
  url: https://calendarmcp.ai/pricing
- type: Blog
  url: https://calendarmcp.ai/blog
- type: Support
  url: https://calendarmcp.ai/dashboard
- type: PrivacyPolicy
  url: https://calendarmcp.ai/privacy
- type: TermsOfService
  url: https://calendarmcp.ai/terms
apis:
- name: Calendar MCP API
  description: API for Calendar MCP service, documented at https://calendarmcp.ai/api/docs
  humanURL: https://calendarmcp.ai/api/docs
  baseURL: null
  aid: calendarmcp-ai:calendar-mcp-api
- aid: calendarmcp-ai:calendarmcp-ai-api
  name: CalendarMCP API
  description: 'CalendarMCP API as documented publicly: 1 operations. Contract generated from the documentation by API Evangelist
    (2026-11-03);

    not the provider''s own document.'
  humanURL: https://calendarmcp.ai/docs
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/calendarmcp-ai-openapi-generated.yml
    x-provenance: generated
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: API documentation is provided as a simple JSON description, not a machine‑readable OpenAPI/GraphQL/AsyncAPI spec.
  evidence:
  - url: https://calendarmcp.ai/api/docs
    status: 200
  checked: '2026-11-03'
x-enrichment:
  date: '2026-11-03'
  status: enriched
  artifacts_added: 17
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

CalendarMCP API — frequently asked questions

Does CalendarMCP have an API?

Yes. APIs.io lists 2 APIs from CalendarMCP, including Calendar MCP API and CalendarMCP API.

Is there an OpenAPI specification for the CalendarMCP API?

Yes. APIs.io indexes 1 OpenAPI specification for CalendarMCP, each linked for download from this page.

How do I authenticate with the CalendarMCP API?

CalendarMCP uses bearer-token authentication (2 schemes). The details are profiled on APIs.io as Calendarmcp Ai Authentication.

Does CalendarMCP have an MCP server?

Yes. APIs.io lists 1 MCP server for CalendarMCP: Remote MCP server at calendarmcp.ai requiring an API key.

Is the CalendarMCP API ready for AI agents?

CalendarMCP has a Kin Score of 20.4 out of 100 (emerging) and an Agent Readiness score of 18.9 (agent-aware), scored by API Evangelist on 2026-11-06.

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