How to Use the Fax.Plus MCP in Pydantic AI

Q: Is the Fax.Plus server compatible with Pydantic AI transports?

Yes, it supports both SSE and HTTP. You can configure the MCPToolset to use the transport that best fits your local or cloud setup.

Q: Can I use Pydantic AI to monitor Fax.Plus transmissions?

You can call listoutboxjobs and map the results to a Pydantic model. This allows your agent to programmatically verify that every fax is processed correctly.

Type-safe Fax.Plus communication for Pydantic AI agents with runtime validation.

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Connect Fax.Plus MCP to Pydantic AI

Create your Vinkius account to connect Fax.Plus 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 Fax.Plus with Pydantic AI

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Strict Pydantic AI Data Validation

Every response from the server is validated against Pydantic models at runtime. If `get_fax_details` returns an unexpected field, your agent stops immediately to prevent data corruption. This ensures that your agent only acts on confirmed, correct data structures. It removes the risk of hallucinated fields in your communication workflows.

Pydantic AI Tooling Integration

Use the `MCPToolset` to bring the 8 server tools into your agent. The setup is unified, supporting both SSE and HTTP transports to match your network requirements. Simply pass the toolset to your agent constructor. Your environment remains type-safe, providing clear feedback if the connection to the server fails.

Reliable Transmission Control

Execute `send_fax` with confidence knowing the input is validated. The agent checks your recipient number against E.164 requirements before the request hits the API. Use `list_outbox_jobs` to keep a clean record of what is currently in flight. If a job returns an error, the agent catches it as a validation failure rather than proceeding blindly.

Setup guide

Set up Fax.Plus 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": {
        "faxplus-mcp": {
            "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
        }
    }
})

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

result = await agent.run("List recent Fax.Plus transactions")
print(result.output)

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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 Fax.Plus. 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 Fax.Plus MCP in Pydantic AI

The library checks every response against predefined models. If the server output doesn't match the expected schema, the agent throws a validation error immediately.

Yes, it supports both SSE and HTTP. You can configure the `MCPToolset` to use the transport that best fits your local or cloud setup.

You can call `list_outbox_jobs` and map the results to a Pydantic model. This allows your agent to programmatically verify that every fax is processed correctly.

The agent will catch the error based on the validation failure. You'll see exactly which field caused the issue, making debugging straightforward.

Security is enforced at the transport layer using your endpoint token. Your fax history and transmission logs are accessed only through validated, authenticated requests within your private Vinkius sandbox.

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