NFe.io MCP Server for LangChain 10 tools — connect in under 2 minutes
LangChain is the leading Python framework for composable LLM applications. Connect NFe.io through the Vinkius and LangChain agents can call every tool natively — combine them with retrievers, memory, and output parsers for sophisticated AI pipelines.
ASK AI ABOUT THIS MCP SERVER
Vinkius supports streamable HTTP and SSE.
import asyncio
from langchain_mcp_adapters.client import MultiServerMCPClient
from langchain_openai import ChatOpenAI
from langgraph.prebuilt import create_react_agent
async def main():
# Your Vinkius token — get it at cloud.vinkius.com
async with MultiServerMCPClient({
"nfeio": {
"transport": "streamable_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,
)
response = await agent.ainvoke({
"messages": [{
"role": "user",
"content": "Using NFe.io, show me what tools are available.",
}]
})
print(response["messages"][-1].content)
asyncio.run(main())
* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure
About NFe.io MCP Server
Connect your AI agents to NFe.io, the leading Brazilian platform for fiscal document automation. This MCP provides 10 tools to manage the full lifecycle of Service Invoices (NFS-e), validate Brazilian municipal codes (IBGE), and monitor corporate metadata for companies integrated into your billing environment.
LangChain's ecosystem of 500+ components combines seamlessly with NFe.io through native MCP adapters. Connect 10 tools via the Vinkius and use ReAct agents, Plan-and-Execute strategies, or custom agent architectures — with LangSmith tracing giving full visibility into every tool call, latency, and token cost.
What you can do
- Invoice Orchestration — Issue, cancel, and retrieve Service Invoices (NFS-e) for multiple cities across Brazil
- Company Management — List and inspect registered companies and their current fiscal configurations
- Service Definition — Manage service codes and tax metadata to ensure accurate fiscal reporting
- Fiscal Intelligence — Retrieve detailed city capabilities and validate IBGE codes for seamless municipal integration
- PDF Retrieval — Generate and retrieve download links for official invoice PDF and XML documents programmatically
The NFe.io MCP Server exposes 10 tools through the Vinkius. Connect it to LangChain in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.
How to Connect NFe.io to LangChain via MCP
Follow these steps to integrate the NFe.io MCP Server with LangChain.
Install dependencies
Run pip install langchain langchain-mcp-adapters langgraph langchain-openai
Replace the token
Replace [YOUR_TOKEN_HERE] with your Vinkius token
Run the agent
Save the code and run python agent.py
Explore tools
The agent discovers 10 tools from NFe.io via MCP
Why Use LangChain with the NFe.io MCP Server
LangChain provides unique advantages when paired with NFe.io through the Model Context Protocol.
The largest ecosystem of integrations, chains, and agents — combine NFe.io MCP tools with 500+ LangChain components
Agent architecture supports ReAct, Plan-and-Execute, and custom strategies with full MCP tool access at every step
LangSmith tracing gives you complete visibility into tool calls, latencies, and token usage for production debugging
Memory and conversation persistence let agents maintain context across NFe.io queries for multi-turn workflows
NFe.io + LangChain Use Cases
Practical scenarios where LangChain combined with the NFe.io MCP Server delivers measurable value.
RAG with live data: combine NFe.io tool results with vector store retrievals for answers grounded in both real-time and historical data
Autonomous research agents: LangChain agents query NFe.io, synthesize findings, and generate comprehensive research reports
Multi-tool orchestration: chain NFe.io tools with web scrapers, databases, and calculators in a single agent run
Production monitoring: use LangSmith to trace every NFe.io tool call, measure latency, and optimize your agent's performance
NFe.io MCP Tools for LangChain (10)
These 10 tools become available when you connect NFe.io to LangChain via MCP:
cancel_merchandise_invoice
Cancel an issued Merchandise Invoice (NF-e)
cancel_service_invoice
Cancel an issued Service Invoice (NFS-e)
create_company
Register a new company (issuer) in NFe.io
get_company_details
Get detailed info for a specific company issuer
get_merchandise_invoice
Retrieve details for a specific Merchandise Invoice (NF-e)
get_service_invoice
Retrieve details for a specific Service Invoice (NFS-e)
issue_merchandise_invoice
Issue a Merchandise Invoice (NF-e)
issue_service_invoice
Issue a Service Invoice (NFS-e)
list_companies
List all companies (issuers) registered in your NFe.io account
list_webhooks
List all configured webhooks in NFe.io
Example Prompts for NFe.io in LangChain
Ready-to-use prompts you can give your LangChain agent to start working with NFe.io immediately.
"List all active companies in my NFe.io account."
"Check the status of service invoice ID 'inv_nfe_999888'."
"Find the IBGE code for the city of 'São Paulo'."
Troubleshooting NFe.io MCP Server with LangChain
Common issues when connecting NFe.io to LangChain through the Vinkius, and how to resolve them.
MultiServerMCPClient not found
pip install langchain-mcp-adaptersNFe.io + LangChain FAQ
Common questions about integrating NFe.io MCP Server with LangChain.
How does LangChain connect to MCP servers?
langchain-mcp-adapters to create an MCP client. LangChain discovers all tools and wraps them as native LangChain tools compatible with any agent type.Which LangChain agent types work with MCP?
Can I trace MCP tool calls in LangSmith?
Connect NFe.io with your favorite client
Step-by-step setup guides for every MCP-compatible client and framework:
Anthropic's native desktop app for Claude with built-in MCP support.
AI-first code editor with integrated LLM-powered coding assistance.
GitHub Copilot in VS Code with Agent mode and MCP support.
Purpose-built IDE for agentic AI coding workflows.
Autonomous AI coding agent that runs inside VS Code.
Anthropic's agentic CLI for terminal-first development.
Python SDK for building production-grade OpenAI agent workflows.
Google's framework for building production AI agents.
Type-safe agent development for Python with first-class MCP support.
TypeScript toolkit for building AI-powered web applications.
TypeScript-native agent framework for modern web stacks.
Python framework for orchestrating collaborative AI agent crews.
Leading Python framework for composable LLM applications.
Data-aware AI agent framework for structured and unstructured sources.
Microsoft's framework for multi-agent collaborative conversations.
Connect NFe.io to LangChain
Get your token, paste the configuration, and start using 10 tools in under 2 minutes. No API key management needed.