What is a CC-e (Carta de Correção)?

CC-e is a Correction Letter used to fix minor errors in an authorized NF-e, such as typos in the buyer's address or product descriptions. It cannot be used to change values, quantities, or tax rates.

When should I use Inutilização?

Use Inutilização when a range of NF-e numbering has been damaged, lost, or will not be used. This tells the tax authority that those numbers are intentionally skipped.

What is DF-e Distribution?

DF-e Distribution allows you to query all fiscal documents (NF-e, CT-e, etc.) issued against your CNPJ. Use it with the last NSU to retrieve only new documents.

Can I automate my accounting department with this?

Yes! The 'List by Period' and 'Download XML & DANFE' tools allow your AI agent to fetch all invoices from a specific month, download the XMLs, and seamlessly integrate them into accounting workflows.

Focus Admin MCP Server for LangChain 10 tools — connect in under 2 minutes

Name: Focus Admin
Availability: InStock
Author: Vinkius

python.langchain.com/docs/integrations/tools/mcp

Built by Vinkius GDPR 10 Tools Framework

LangChain is the leading Python framework for composable LLM applications. Connect Focus Admin through Vinkius and LangChain agents can call every tool natively. combine them with retrievers, memory, and output parsers for sophisticated AI pipelines.

Get MCP Server for AI Agents

ASK AI ABOUT THIS MCP SERVER

Open in ChatGPT Open in Claude Open in Perplexity

Vinkius supports streamable HTTP and SSE.

python

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({
        "focus-admin": {
            "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 Focus Admin, show me what tools are available.",
            }]
        })
        print(response["messages"][-1].content)

asyncio.run(main())

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Stream every event to Splunk, Datadog, or your own webhook in real-time

* 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 Focus Admin MCP Server

Connect Focus Admin to any AI agent and access advanced fiscal management tools — send Correction Letters (CC-e), inutilize NF-e numbering, distribute DF-e documents, download XMLs and DANFEs, and list all invoices by period through natural conversation.

LangChain's ecosystem of 500+ components combines seamlessly with Focus Admin through native MCP adapters. Connect 10 tools via 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

Send CC-e — Issue Correction Letters for authorized NF-e with minor errors
Cancel CC-e — Cancel previously sent Correction Letters
Inutilize Numbering — Mark damaged or lost NF-e numbering ranges as unused
Download XML & DANFE — Retrieve authorized NF-e XML documents and DANFE PDFs
Distribute DF-e — Query available DF-e documents for your CNPJ by NSU
List by Period — Retrieve all NF-e or NFS-e issued or received within a date range
Download Event XML — Get XML for specific NF-e events (manifestations, CC-e, etc.)

The Focus Admin 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 Focus Admin to LangChain via MCP

Follow these steps to integrate the Focus Admin 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 Focus Admin via MCP

Why Use LangChain with the Focus Admin MCP Server

LangChain provides unique advantages when paired with Focus Admin through the Model Context Protocol.

The largest ecosystem of integrations, chains, and agents. combine Focus Admin 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 Focus Admin queries for multi-turn workflows

Focus Admin + LangChain Use Cases

Practical scenarios where LangChain combined with the Focus Admin MCP Server delivers measurable value.

RAG with live data: combine Focus Admin tool results with vector store retrievals for answers grounded in both real-time and historical data

Autonomous research agents: LangChain agents query Focus Admin, synthesize findings, and generate comprehensive research reports

Multi-tool orchestration: chain Focus Admin tools with web scrapers, databases, and calculators in a single agent run

Production monitoring: use LangSmith to trace every Focus Admin tool call, measure latency, and optimize your agent's performance

Focus Admin MCP Tools for LangChain (10)

These 10 tools become available when you connect Focus Admin to LangChain via MCP:

cancel_cc_e

Cancel a previously sent CC-e

distribute_dfe

Distribute DF-e documents (consult NSU)

download_event_xml

Download XML for a specific NF-e event

download_nfe_danfe

Download NF-e DANFE PDF

download_nfe_xml

Download NF-e XML document

inutilize_numbering

Inutilize a range of NF-e numbering

list_nfe_by_period

List NF-e documents by period

list_nfse_emitted

List NFS-e emitted by the company

list_nfse_received

List NFS-e received (tomadas) by the company

send_cc_e

Send a Correction Letter (CC-e) for NF-e

Example Prompts for Focus Admin in LangChain

Ready-to-use prompts you can give your LangChain agent to start working with Focus Admin immediately.

"Send a CC-e for NF-e REF-001 correcting the buyer's phone number."

"Inutilize NF-e numbering from 1000 to 1050 for series 1, model 55, year 2026."

"List all NF-e issued by CNPJ 12.345.678/0001-00 from 2026-03-01 to 2026-03-31."

Troubleshooting Focus Admin MCP Server with LangChain

Common issues when connecting Focus Admin to LangChain through the Vinkius, and how to resolve them.

MultiServerMCPClient not found

Install: pip install langchain-mcp-adapters

Focus Admin + LangChain FAQ

Common questions about integrating Focus Admin MCP Server with LangChain.

How does LangChain connect to MCP servers?

Use 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?

All agent types including ReAct, OpenAI Functions, and custom agents work with MCP tools. The tools appear as standard LangChain tools after the adapter wraps them.