How to Use the BR Business Days Calculator MCP in LangChain

Q: Can LangChain handle negative days with the BR Business Days Calculator?

Yes, the addbusinessdays tool accepts negative integers. Your LangChain agent can pass a negative number to find out when a process started based on Brazilian business days.

Get exact Brazilian SLA dates in your LangChain chains without letting LLMs hallucinate calendar math.

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Connect BR Business Days Calculator MCP to LangChain

Create your Vinkius account to connect BR Business Days Calculator to LangChain and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup BR Business Days Calculator with LangChain

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Stop LLM calendar math errors in LangChain

The `add_business_days` tool lets your agent add or subtract Brazilian business days deterministically. LangChain agents usually struggle with calendar math, especially when dealing with foreign holidays, but this tool offloads that work to a local engine. By feeding this tool's output directly into your next chain link, you prevent cascading errors in multi-step workflows. Your agent gets the exact date instantly instead of guessing.

Validate Brazilian business days in your chains

The `is_business_day` tool checks if any ISO date falls on a weekend or a Brazilian national holiday. You can run this check inside a LangChain runnable to decide if an operations agent should trigger an alert today or queue it for Monday. This setup keeps your automated pipelines accurate. You don't have to write custom holiday parsers because the MCP server handles the calendar logic locally.

Track SLA calculation latency with LangSmith

Every time your LangChain agent calls `add_business_days`, you can monitor the latency and input parameters in LangSmith. The tool execution fits right into your existing tracing pipelines. This integration means you can debug failing SLA calculations quickly. You'll see the exact date strings passed to this MCP server and how your agent used the resulting date in subsequent steps.

Setup guide

Set up BR Business Days Calculator 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 BR Business Days Calculator 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({
    "br-business-days-calculator-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 BR Business Days Calculator transactions"
    })
    print(result["messages"][-1].content)

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Common questions about BR Business Days Calculator MCP in LangChain

You install the MCP adapter package and pass the server URL to the multi-server client. Then, get the tools and hand them to your agent creator. It takes about five lines of code.

Yes, the `add_business_days` tool accepts negative integers. Your LangChain agent can pass a negative number to find out when a process started based on Brazilian business days.

Absolutely, you can use these tools inside LangGraph state charts. The node calls the server to resolve dates before routing the execution path.

The engine skips all official Brazilian national holidays along with standard weekends. It ensures your operations respect local calendar realities without manual updates.

The server only processes ISO date strings and integer offsets. No personal data or proprietary SLA details ever leave your secure Vinkius environment.

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