How to Use the Facturama (SAT) MCP in LangChain

Q: Can I trace Facturama (SAT) tool calls in LangSmith when using this MCP?

Yes, every single tool execution like listinvoices or createclient is fully tracked in your LangSmith dashboard. You get complete visibility into the exact JSON payloads, latency, and token costs of your tax workflows. This makes debugging complex Mexican invoicing chains straightforward.

Q: How do I pass custom SAT codes to a LangChain agent using the Facturama (SAT) MCP?

You run listcatalog to fetch the valid SAT codes and feed them directly into the agent's prompt context. From there, the LangChain agent selects the appropriate code and passes it to createinvoice. This setup ensures your automated invoices always use legally compliant fiscal keys.

Run multi-step Mexican tax invoicing chains in LangChain with direct Facturama (SAT) tool integration.

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Connect Facturama (SAT) MCP to LangChain

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Setup Facturama (SAT) with LangChain

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Automated SAT Invoicing Chains

The `create_invoice` tool acts as the execution step in your LangChain tax generation pipeline. Your agent chain first reads client details with `get_client` and maps correct product codes via `list_products`. Once the run completes, the chain feeds the generated CFDI data directly into `send_invoice_email` to notify the buyer. LangSmith traces every step of this multi-tool sequence so you see the exact payload passed to the SAT gateway.

Dynamic Catalog Mapping with LangChain MCP Server

By calling `list_catalog`, your LangChain agent gets the official Mexican tax keys required for legal CFDI 4.0 registration. Instead of hardcoding product classifications, your pipeline queries `get_product` to match internal SKUs with SAT codes. This dynamic mapping feeds into `list_taxes` to determine the correct tax rate before generating any document. Because the chain updates its context on the fly, your automated billing remains compliant even when fiscal rules shift.

Automated CFDI Cancellation Workflows

With `cancel_invoice`, your LangChain agent handles billing errors without manual accounting intervention. When a dispute arises, the chain triggers `get_invoice_file` to pull the original document and verify its status. After validation, the agent runs the cancellation and updates your internal CRM using `list_clients`. Every tool call in this corrective chain is logged, giving your finance team a clear audit trail of all SAT interactions.

Setup guide

Set up Facturama (SAT) 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 Facturama (SAT) 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({
    "facturama-sat-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 Facturama (SAT) transactions"
    })
    print(result["messages"][-1].content)

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Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Facturama (SAT Mexico). All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about Facturama (SAT) MCP in LangChain

Your LangChain agent catches API exceptions directly within the chain run, allowing you to trigger fallback logic immediately. If the SAT gateway rejects a payload, the agent reads the error code and can query `get_tax_status` to diagnose the issue. This prevents broken pipelines from halting your B2B billing operations.

Yes, every single tool execution like `list_invoices` or `create_client` is fully tracked in your LangSmith dashboard. You get complete visibility into the exact JSON payloads, latency, and token costs of your tax workflows. This makes debugging complex Mexican invoicing chains straightforward.

You run `list_catalog` to fetch the valid SAT codes and feed them directly into the agent's prompt context. From there, the LangChain agent selects the appropriate code and passes it to `create_invoice`. This setup ensures your automated invoices always use legally compliant fiscal keys.

Yes, you can use the LangChain multi-server adapter to connect this MCP Server alongside your other databases. This lets your agent pull customer data from a CRM and immediately run `create_client` on the Mexican tax server. It's a clean way to centralize your entire international billing stack into a single cognitive loop.

All sensitive tax profiles and B2B invoice data processed by `get_client` and `create_invoice` run inside an isolated Vinkius sandboxed environment. Your raw API keys and Mexican fiscal records are never stored or exposed to external models. Because it uses ephemeral execution, your tax data vanishes the moment the tool run wraps up.

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