How to Use the Facturama (SAT) MCP in Pydantic AI

Q: Does Pydantic AI validate the output of Facturama (SAT) tools?

Yes, every response from tools like listinvoices or getclient is validated against Pydantic models. If the schema doesn't match, your agent halts execution immediately.

Q: Can Pydantic AI handle invoice cancellation on Facturama (SAT)?

Yes, your agent uses the cancelinvoice tool to void issued CFDIs. The response is validated to ensure the SAT has officially registered the cancellation.

Build type-safe Mexican tax workflows with Pydantic AI and the Facturama (SAT) MCP Server.

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Connect Facturama (SAT) MCP to Pydantic AI

Create your Vinkius account to connect Facturama (SAT) to Pydantic AI 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 Facturama (SAT) with Pydantic AI

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Type-safe client registration with Pydantic AI

The `create_client` tool registers new buyers while Pydantic AI validates their RFC tax details against strict runtime models. Your agent queries `get_client` or `list_clients` to confirm the profile matches Mexican tax laws exactly. If the API returns unexpected or malformed data, your Python code fails loudly with a validation error. This prevents corrupted client profiles from entering your system, saving your team from manual cleanup work down the road.

Issue error-free CFDI invoices with strict schemas

The `create_invoice` tool executes the generation of official Mexican tax invoices using data validated by your Pydantic models. Your agent uses `list_taxes` and `list_catalog` to verify tax rates and product codes before calling the API. By enforcing strict schemas, you ensure that every payload sent to Facturama is structurally perfect. If a transaction needs to be reversed, the agent calls `cancel_invoice` and uses `delete_client` to manage the lifecycle cleanly.

Fetch and verify tax files with Pydantic AI

The `get_invoice_file` tool extracts the Base64 representation of your tax invoices, which your agent parses and validates. Your agent can then trigger `send_invoice_email` to deliver the files or check compliance status using `get_tax_status`. You can also query `list_invoices` to audit your records or search for specific items using `get_product` and `list_products`. Every response is checked against your defined Pydantic types to ensure absolute data integrity.

Setup guide

Set up Facturama (SAT) MCP in Pydantic AI

Prerequisites

Python 3.10+ installed
pydantic-ai-slim[fastmcp] package
Active Vinkius subscription with a valid endpoint token

1

Install Pydantic AI with FastMCP
Run pip install "pydantic-ai-slim[fastmcp]". The FastMCP toolset replaces the deprecated MCPServerHTTP class with full protocol support.
2

Configure the FastMCPToolset
Pass a JSON-style config dict to FastMCPToolset with your Vinkius URL. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. Supports Streamable HTTP, SSE, and Stdio transports.
3

Create and run your agent
Pass the toolset to Agent(toolsets=[toolset]) and call agent.run(). Swap openai:gpt-4o for any supported model — Anthropic, Google, Mistral, or Groq.

agent.py

from pydantic_ai import Agent
from pydantic_ai.toolsets.fastmcp import FastMCPToolset

toolset = FastMCPToolset({
    "mcpServers": {
        "facturama-sat-mcp": {
            "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
        }
    }
})

agent = Agent(
    "openai:gpt-4o",
    toolsets=[toolset],
    system_prompt="You have access to Facturama (SAT) tools.",
)

result = await agent.run("List recent Facturama (SAT) transactions")
print(result.output)

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Common questions about Facturama (SAT) MCP in Pydantic AI

Install the slim package with MCP support via pip. Initialize the unified MCPToolset with your Vinkius HTTP endpoint and pass it to your Pydantic AI agent.

Yes, every response from tools like `list_invoices` or `get_client` is validated against Pydantic models. If the schema doesn't match, your agent halts execution immediately.

Yes, your agent uses the `cancel_invoice` tool to void issued CFDIs. The response is validated to ensure the SAT has officially registered the cancellation.

The server supports both Streamable HTTP and SSE transports. You configure this when setting up the MCPToolset in your Pydantic AI application.

All API requests to this MCP server run through an ephemeral V8 sandbox. This zero-trust architecture ensures your tax tokens and client RFC data are never stored or logged on Vinkius.

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