How to Use the IBGE Economia — CNAE Activities MCP in LangChain

Map Brazilian business activities directly in your LangChain runs to automate complex tax and compliance pipelines.

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Connect IBGE Economia — CNAE Activities MCP to LangChain

Create your Vinkius account to connect IBGE Economia — CNAE Activities 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 IBGE Economia — CNAE Activities with LangChain

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Chain CNAE classifications for tax automation

The `list_secoes_cnae` tool lets your LangChain agent pull top-level Brazilian economic sectors to kick off structured tax classification chains. Your agent runs these queries sequentially, feeding the output of one step into the next to drill down from broad sectors to specific tax brackets. By feeding the results of `list_divisoes_cnae` directly into subsequent LLM prompts, your chain automates the heavy lifting of Brazilian tax classification. This setup removes manual lookup errors entirely, giving your compliance pipeline direct access to the official IBGE taxonomy.

Build deep-dive compliance agents with LangGraph

This MCP Server connects your LangGraph agents directly to the official Brazilian economic taxonomy via `list_classes_cnae` to map company profiles. Your multi-step reasoning loops use this tool to verify if a business activity matches local municipal tax rules before committing data to your ERP. When your agent triggers `list_subclasses_por_classe`, it evaluates the exact 7-digit code against municipal tax tables. You can monitor the entire execution path in LangSmith, verifying exactly how the agent navigated the IBGE taxonomy to reach its compliance decision.

Retrieve exact subclass details with this MCP Server

The `get_subclasse_cnae` tool retrieves the final, granular details of any Brazilian business activity code to resolve registration disputes in your LangChain application. Your agent calls this tool when it needs to verify if a specific corporate entity is legally allowed to operate in its declared sector. Instead of hardcoding lookup tables that go out of date, your chain queries the live IBGE database dynamically. This ensures your automated onboarding system always uses the current federal classification standard without manual database maintenance.

Setup guide

Set up IBGE Economia — CNAE Activities 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 IBGE Economia — CNAE Activities 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({
    "ibge-economia-cnae-activities-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 IBGE Economia — CNAE Activities transactions"
    })
    print(result["messages"][-1].content)

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Common questions about IBGE Economia — CNAE Activities MCP in LangChain

You configure the LangChain adapter to handle retries or backoff when calling the IBGE Economia — CNAE Activities endpoints. The underlying MCP Server executes these requests cleanly, but wrapping the client in a standard LangChain runnable with retry logic prevents rate-limiting failures during large batch operations.

Yes, every tool call shows up in your LangSmith dashboard with full inputs and outputs. You see the latency, token costs, and exact Brazilian taxonomy data returned by the IBGE Economia — CNAE Activities MCP Server in real time.

You pass both the IBGE Economia — CNAE Activities tools and your database tool to the same LangChain agent. The agent queries `get_subclasse_cnae` to fetch the official Brazilian code and then writes that validated classification straight to your local database.

Yes, you can register this MCP Server alongside others using the MultiServerMCPClient. Your LangChain agent decides when to query the Brazilian taxonomy and when to trigger other connected APIs in the same execution run.

The server only processes public Brazilian CNAE codes and taxonomy queries, meaning no proprietary corporate data is sent to external APIs. All communication runs locally through the secure Vinkius sandbox, keeping your internal tax queries entirely private.

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