Calendly MCP Server
for AI Agents
Connect your AI agent to StackOne's Calendly MCP server and give it 47 MCP tools out of the box. Auth, tool execution, and security all managed.
StackOne 
Coverage
47 Agent Actions
Create, read, update, and delete across Calendly — and extend your agent's capabilities with custom actions.
Authentication
Agent Tool Authentication
Per-user OAuth in one call. Your Calendly MCP server gets session-scoped tokens with zero credentials stored on your infra.
Agent Auth →
Security
Agent Protection
Every Calendly tool response scanned for prompt injection in milliseconds — 88.7% accuracy, all running on CPU.
Prompt Injection Defense →
Performance
Max Agent Context. Min Cost.
Free up to 96% of your agent's context window to enhance reasoning and reduce cost, on every Calendly call.
Tools Discovery →What is the Calendly MCP Server?
A Calendly MCP server lets AI agents read and write Calendly data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's Calendly MCP server ships with 47 pre-built actions, fully extensible via the Connector Builder — plus managed authentication, prompt injection defense, observability, and agent execution runtime. Connect it from MCP clients like Claude Desktop, Claude Code, Cursor, Goose, and VS Code, or from agent frameworks like OpenAI Agents SDK, LangChain, and Vercel AI SDK.
All Calendly MCP Tools
Every action from Calendly's API, ready for your agent. Create, read, update, and delete — scoped to exactly what you need.
Event Types
- List Event Types
Retrieve all event types for a specific user or organization with filtering and pagination options
- Get Event Type
Get information about a specific event type
Scheduled Events
- List Scheduled Events
List scheduled events that have been booked
- Get Scheduled Event
Get information about a specific scheduled event
Organization Memberships
- List Organization Memberships
List all memberships for an organization or user (either organization or user parameter is required)
- Get Organization Membership
Get information about a specific organization membership
- Remove Organization Membership
Remove a user from an organization
Organization Invitations
- List Organization Invitations
List all pending invitations for an organization (requires organization owner or admin role)
- Get Organization Invitation
Get information about a specific organization invitation (requires organization owner or admin role)
Routing Forms
- List Routing Forms
List all routing forms for an organization
- Get Routing Form
Get information about a specific routing form
Routing Form Submissions
- List Routing Form Submissions
List all submissions for a routing form
- Get Routing Form Submission
Get information about a specific routing form submission
User Availability Schedules
- List User Availability Schedules
List all availability schedules for a user
- Get User Availability Schedule
Get a specific availability schedule for a user
Webhook Subscriptions
- Create Webhook Subscription
Create a new webhook subscription for an organization or user (may require premium plan)
- List Webhook Subscriptions
List all webhook subscriptions for an organization or user (may require premium plan)
- Get Webhook Subscription
Get information about a specific webhook subscription (may require premium plan)
- Delete Webhook Subscription
Delete a webhook subscription (may require premium plan)
Unified Groups
- List Unified Groups
List Calendly groups in the caller's organization, mapped to the StackOne IAM unified group schema. Wraps GET /groups. Available to Owners/Admins on Professional, Teams, and Enterprise plans.
- Get Unified Group
Retrieve a single Calendly group by UUID. Wraps GET /groups/{uuid} and maps to the StackOne IAM unified group schema. Available to Owners/Admins on Professional, Teams, and Enterprise plans.
Unified Organizations
- List Unified Organizations
Return the single Calendly organization associated with the authenticated user, modeled as an IAM organization. Calendly tokens are scoped to one user and that user has exactly one current_organization. Maps the org detail (from GET /organizations/{uuid}) to the StackOne IAM unified organization schema.
- Get Unified Organization
Retrieve a Calendly organization by UUID. Wraps GET /organizations/{uuid} and maps to the StackOne IAM unified organization schema. The id input is the organization UUID (the last path segment of the Calendly organization URI returned by unified_list_organizations).
Unified Roles
- List Unified Roles
Return the three Calendly organization roles as IAM role records (owner, admin, user). Synthesized list — Calendly has no public roles API. Role keys match the raw role strings returned on organization_membership records and on IamUser.roles[*].id from unified_list_users.
- Get Unified Role
Retrieve a single Calendly organization role by its key (owner, admin, or user). Returns the synthesized IamRole record matching that key, or 404 for an unrecognized key. Performs a /users/me auth probe to surface 401 when credentials are invalid.
Unified Users
- List Unified Users
List Calendly organization users mapped to the StackOne IAM unified user schema. Wraps GET /organization_memberships for the current user's organization. Each entry surfaces the user's UUID, email, name, avatar, timezone, creation timestamp, and (with expand=roles) their role scoped to the workspace.
- Get Unified User
Retrieve a single Calendly user by UUID, mapped to the StackOne IAM unified user schema. Wraps GET /users/{uuid} for profile data. With expand=roles, also looks up the user's membership role in the current organization to attach an inline IamRole entry.
Other (20)
- Create Scheduling Link
Create a single-use scheduling link for an event type
- Create Share (Customize Once And Share)
Create a customized one-time event link with specific settings without creating a new event type
- Get Current User
Get information about the currently authenticated user
- Get User
Get information about a specific user by UUID
- List Available Times
Get available meeting times for an event type
- List Event Invitees
List all invitees for a scheduled event
- Get Invitee
Get information about a specific event invitee
- Get Invitee No-Show
Get information about a specific invitee no-show record
- Get Organization
Get information about a specific organization
- List User Busy Times
Get a user's busy times from connected calendars for a specific date range (requires ISO 8601 format with microseconds)
- List Activity Log Entries
List audit trail entries for an organization (requires Enterprise plan)
- Get Unified Credentials
Return the authenticated identity and auth type for the current Calendly connection. Calls GET /users/me to derive the credential identity (authenticated user's email) and uses a static_values bridge to discriminate OAuth from Personal Access Token via credentials.refreshToken presence (OAuth only). Maps to the StackOne IAM unified credentials schema, including an inline user profile.
- Delete Invitee Data (GDPR)
Delete all personal data for invitee emails (requires Enterprise plan, GDPR compliance)
- Delete Scheduled Event Data (GDPR)
Delete all scheduled event data within a date range (requires Enterprise plan, GDPR compliance)
- Cancel Scheduled Event
Cancel a scheduled event
- Mark Invitee As No-Show
Mark an invitee as a no-show for a scheduled event
- Unmark Invitee No-Show
Remove the no-show status from an invitee
- Schedule Event (Create Invitee)
Programmatically schedule a Calendly meeting by creating an invitee for a specific event type and time
- Invite User To Organization
Send an invitation to join the organization (requires organization owner or admin role)
- Revoke Organization Invitation
Revoke a pending organization invitation (requires organization owner or admin role)
Set Up Your Calendly MCP Server in Minutes
One endpoint. Any framework. Your agent is talking to Calendly in under 10 lines of code.
Agent Frameworks
JSON{
"mcpServers": {
"stackone": {
"command": "npx",
"args": [
"-y",
"mcp-remote@latest",
"https://api.stackone.com/mcp?x-account-id=<account_id>",
"--header",
"Authorization: Basic <YOUR_BASE64_TOKEN>"
]
}
}
}Platform Resources
MCP Code Mode: Keeping Tool Responses Out of Agent Context
Anthropic's code_execution processes data already in context. Custom MCP code mode keeps raw tool responses in a sandbox. 14K tokens vs 500.
11 min
Comparing BM25, TF-IDF, and Hybrid Search for MCP Tool Discovery
Benchmarking BM25, TF-IDF, and hybrid search for MCP tool discovery across 916 tools. The 80/20 TF-IDF/BM25 hybrid hits 21% Top-1 accuracy in under 1ms.
10 min
Indirect Prompt Injection Defense for MCP Tools: A Technical Guide
MCP tools that read emails, CRM records, and tickets are indirect prompt injection vectors. Here's how we built a two-tier defense that scans tool results in ~11ms.
12 min
MCP vs A2A: Architecture, Security, and When to Use Each
MCP vs A2A: what each protocol standardizes, how they differ, their shared security risks including indirect prompt injection, and when to use one, both, or a hybrid architecture.
12 min
MCP vs API: What 200+ Connector Builds Taught Us
MCP wraps APIs, it doesn't replace them. After building 200+ connectors that serve both, here's when each approach wins.
14 min read
Calendly MCP Server FAQ
Does StackOne have a Calendly MCP server?
Calendly MCP server vs direct API integration — what's the difference?
How does Calendly authentication work for AI agents?
origin_owner_id.Are Calendly MCP tools vulnerable to prompt injection?
What is the context bloat of a Calendly agent and how do I avoid it?
Can I limit which actions my Calendly agent can access?
Can I create custom agent actions for my Calendly MCP server?
When should I NOT use a Calendly MCP server?
What AI frameworks and AI clients does the StackOne Calendly MCP server support?
Put your AI agents to work
All the tools you need to build and scale AI agent integrations, with best-in-class connectivity, execution, and security.