Build an MCP server with Google Calendar and custom functions

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

Learn how to build an MCP Server and Client in n8n with official nodes. Requires n8n version 1.88.0 or higher. In this example, we use Google Calendar and custom functions as two separate MC...

Best for

Engineering automation workflows
AI RAG automation workflows
advanced n8n builders looking for reusable templates

Tools used

@n8n/n8n-nodes-langchain.agent, n8n-nodes-base.googlecalendartool, @n8n/n8n-nodes-langchain.mcptrigger, n8n-nodes-base.executeworkflowtrigger, n8n-nodes-base.switch, n8n-nodes-base.set, @n8n/n8n-nodes-langchain.toolworkflow, @n8n/n8n-nodes-langchain.chattrigger

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Solomon.

Original n8n.io source

1.1 Workflow description

Title: Build an MCP server with Google Calendar and custom functions
Workflow name: Build an MCP server with Google Calendar and custom functions

Learn how to build an MCP Server and Client in n8n with official nodes.

> ⚠ Requires n8n version 1.88.0 or higher.

In this example, we use Google Calendar and custom functions as two separate MCP Servers, demonstrating how to integrate both native and custom tools.

How it works

The AI Agent connects to two MCP Servers. Each MCP Trigger (Server) generates a URL exposing its tools. This URL is used by an MCP Client linked to the AI Agent.

Whenever you make changes to the tools, there’s no need to modify the MCP Client. It automatically keeps the AI Agent informed on how to use each tool, even if you change them over time.

That’s the power of MCP 🙌

Who is this template for

Anyone looking to use MCP with their AI Agents.

How to set up

Instructions are included within the workflow itself.

Check out my other templates

👉 https://n8n.io/creators/solomon/

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - AI Agent

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 1.8

Block 2 - SearchEvent

Type / Role: n8n-nodes-base.googleCalendarTool - googleCalendarTool
Config choices: Version 1.3

Block 3 - CreateEvent

Type / Role: n8n-nodes-base.googleCalendarTool - googleCalendarTool
Config choices: Version 1.3

Block 4 - UpdateEvent

Type / Role: n8n-nodes-base.googleCalendarTool - googleCalendarTool
Config choices: Version 1.3

Block 5 - DeleteEvent

Type / Role: n8n-nodes-base.googleCalendarTool - googleCalendarTool
Config choices: Version 1.3

Block 6 - Google Calendar MCP

Type / Role: @n8n/n8n-nodes-langchain.mcpTrigger - mcpTrigger
Config choices: Version 1

Block 7 - When Executed by Another Workflow

Type / Role: n8n-nodes-base.executeWorkflowTrigger - executeWorkflowTrigger
Config choices: Version 1.1

Block 8 - Switch

Type / Role: n8n-nodes-base.switch - switch
Config choices: Version 3.2

Block 9 - Convert Text to Upper Case

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 10 - Convert Text to Lower Case

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 11 - Convert Text

Type / Role: @n8n/n8n-nodes-langchain.toolWorkflow - toolWorkflow
Config choices: Version 2.1

Block 12 - When chat message received

Type / Role: @n8n/n8n-nodes-langchain.chatTrigger - chatTrigger
Config choices: Version 1.1

Block 13 - Simple Memory

Type / Role: @n8n/n8n-nodes-langchain.memoryBufferWindow - memoryBufferWindow
Config choices: Version 1.3

Block 14 - Calendar MCP

Type / Role: @n8n/n8n-nodes-langchain.mcpClientTool - mcpClientTool
Config choices: Version 1

Block 15 - My Functions

Type / Role: @n8n/n8n-nodes-langchain.mcpClientTool - mcpClientTool
Config choices: Version 1

Block 16 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 17 - My Functions Server

Type / Role: @n8n/n8n-nodes-langchain.mcpTrigger - mcpTrigger
Config choices: Version 1

Block 18 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 19 - Random user data

Type / Role: n8n-nodes-base.debugHelper - debugHelper
Config choices: Version 1

Block 20 - Sticky Note2

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 21 - Generate random user data

Type / Role: @n8n/n8n-nodes-langchain.toolWorkflow - toolWorkflow
Config choices: Version 2.1

Block 22 - Return only some fields

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 23 - Joke Request

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 24 - Random Jokes

Type / Role: @n8n/n8n-nodes-langchain.toolWorkflow - toolWorkflow
Config choices: Version 2.1

Showing the first 24 of 33 workflow blocks. Download the JSON for the full node graph.

3. Summary Table

Workflow	Build an MCP server with Google Calendar and custom functions
Complexity	advanced
Nodes	33
Categories	Engineering, AI RAG
Author	Solomon
Published	10 Apr 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/3514/3514.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Engineering workflows AI RAG workflows

Frequently asked questions

What does Build an MCP server with Google Calendar and custom functions do?

Learn how to build an MCP Server and Client in n8n with official nodes. Requires n8n version 1.88.0 or higher. In this example, we use Google Calendar and custom functions as two separate MC...

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Engineering, AI RAG use case.

Solomon

18 workflows

Nodes

@n8n/n8n-nodes-langchain.agent n8n-nodes-base.googlecalendartool @n8n/n8n-nodes-langchain.mcptrigger n8n-nodes-base.executeworkflowtrigger n8n-nodes-base.switch n8n-nodes-base.set @n8n/n8n-nodes-langchain.toolworkflow @n8n/n8n-nodes-langchain.chattrigger

Complexity

advanced

Published 10 Apr 2025

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/3514/3514.json

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Build an MCP server with Google Calendar and custom functions

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

How it works

Who is this template for

How to set up

Check out my other templates

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - AI Agent

Block 2 - SearchEvent

Block 3 - CreateEvent

Block 4 - UpdateEvent

Block 5 - DeleteEvent

Block 6 - Google Calendar MCP

Block 7 - When Executed by Another Workflow

Block 8 - Switch

Block 9 - Convert Text to Upper Case

Block 10 - Convert Text to Lower Case

Block 11 - Convert Text

Block 12 - When chat message received

Block 13 - Simple Memory

Block 14 - Calendar MCP

Block 15 - My Functions

Block 16 - Sticky Note

Block 17 - My Functions Server

Block 18 - Sticky Note1

Block 19 - Random user data

Block 20 - Sticky Note2

Block 21 - Generate random user data

Block 22 - Return only some fields

Block 23 - Joke Request

Block 24 - Random Jokes

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions