How to Use the Truto Unified Calendar MCP in LangChain

Q: How do I manage calendars using Truto Unified Calendar with LangChain?

You first use listcalendars to see every connected calendar ID. Then, you can build a chain that uses this ID in the getfreebusy tool to find an open slot before calling createevent.

Q: Can LangChain handle listing events from multiple sources?

Yes. The listevents tool pulls titles, times, and attendees for a specific calendar ID into one unified format. This happens whether the event originated in Google or Outlook.

Q: Does Truto Unified Calendar support updating events with LangChain?

It does. Use updateevent by providing the event ID and a JSON object detailing exactly which fields—like the description or attendees—need changing. The change passes through to the real provider immediately.

Q: How do I check if my connections are working with Truto Unified Calendar and LangChain?

You run validateconnection. This checks credentials, permissions, and API accessibility for any given account. It tells you right away if there are errors before your agent attempts to schedule anything.

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Setup Truto Unified Calendar with LangChain

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Perplexity

Build multi-step scheduling chains.

The `get_free_busy` tool lets your agent check availability for a calendar ID and time range. This is key when building complex, multi-person meeting planners. The agent then uses the returned time blocks to decide where to call `create_event`, ensuring the new appointment doesn't conflict with existing commitments.

Manage event details across providers.

`get_event` fetches all details for a specific event, pulling data points like attendees and location from whichever provider it lives on. It returns titles, descriptions, start/end times, and recurrence rules in one unified format. Need to change something? The `update_event` tool takes an event ID and lets you pass a JSON object with the exact fields that need changing. Changes happen live across all connected systems.

List and validate connections for context.

`list_calendars` shows every calendar attached to Truto, regardless of whether it's Google or Outlook. This is useful when your agent needs to know which services are even available. The `validate_connection` tool checks credentials and permissions before any scheduling happens. You can build a check step right at the start of your chain to make sure all necessary accounts are active.

Setup guide

Set up Truto Unified Calendar MCP in LangChain

Prerequisites

Python 3.10+ installed
langchain-mcp-adapters + langgraph packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run pip install langchain-mcp-adapters langgraph langchain-openai. The MCP adapters package converts MCP tools into native LangChain BaseTool objects.
2

Connect via HTTP transport
Use MultiServerMCPClient with "transport": "http" pointing to your Vinkius endpoint. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Create a ReAct agent
Pass the discovered tools to create_react_agent() from LangGraph. The agent automatically routes Truto Unified Calendar tool calls through the MCP protocol.
4

Run with any LLM
Swap ChatOpenAI for ChatAnthropic, ChatGoogleGenerativeAI, or any LangChain-compatible model. The MCP tools work identically across all providers.

agent.py

from langchain_mcp_adapters.client import MultiServerMCPClient
from langgraph.prebuilt import create_react_agent
from langchain_openai import ChatOpenAI

async with MultiServerMCPClient({
    "truto-unified-calendar-mcp": {
        "transport": "http",
        "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
    }
}) as client:
    tools = client.get_tools()

    agent = create_react_agent(
        ChatOpenAI(model="gpt-4o"),
        tools,
    )
    result = await agent.ainvoke({
        "messages": "List recent Truto Unified Calendar transactions"
    })
    print(result["messages"][-1].content)

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Common questions about Truto Unified Calendar MCP in LangChain

You first use `list_calendars` to see every connected calendar ID. Then, you can build a chain that uses this ID in the `get_free_busy` tool to find an open slot before calling `create_event`.

Yes. The `list_events` tool pulls titles, times, and attendees for a specific calendar ID into one unified format. This happens whether the event originated in Google or Outlook.

This MCP Server handles scheduling metadata, including titles, start/end times (ISO 8601), attendees' emails, and location strings. The core data type is event information.

It does. Use `update_event` by providing the event ID and a JSON object detailing exactly which fields—like the description or attendees—need changing. The change passes through to the real provider immediately.

You run `validate_connection`. This checks credentials, permissions, and API accessibility for any given account. It tells you right away if there are errors before your agent attempts to schedule anything.

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