How to Use the ISS Calculator MCP in Pydantic AI

Q: How do I connect ISS Calculator to Pydantic AI?

Install the package with pip install "pydantic-ai-slimmcp" to prepare your Pydantic AI agent for the ISS Calculator MCP. Use the MCPToolset class with the HTTP URL of your ISS Calculator host, and pass it to your Pydantic AI agent in the toolsets list.

Ensure type-safe municipal tax calculations by connecting ISS Calculator MCP to Pydantic AI.

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Connect ISS Calculator MCP to Pydantic AI

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Setup ISS Calculator with Pydantic AI

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Resolve municipal tax rates with strict type safety

Providing the current tax rate for a specific city is handled by this ISS Calculator MCP using `get_applicable_rate` to prevent billing errors in your Pydantic AI agent. Your Pydantic AI agent validates the returned ISS Calculator rate against a strict schema at runtime. If the ISS Calculator tool returns an unexpected data format, the Pydantic AI framework raises a validation error immediately.

Verify withholding requirements with zero silent failures

To check if a transaction requires tax withholding, this ISS Calculator MCP uses `check_withholding_status` before your Pydantic AI agent finalizes an invoice. Your Pydantic AI agent processes this ISS Calculator boolean check to ensure compliance with local tax laws. The Pydantic AI runtime validation guarantees that the ISS Calculator withholding flag is always a clean boolean.

Calculate exact tax liability with Pydantic AI

Computing the final tax amount is done by this ISS Calculator MCP using `calculate_tax_liability` based on the service category and municipality for your Pydantic AI agent. Your Pydantic AI agent executes this ISS Calculator calculation to generate compliant invoices. The Pydantic AI framework ensures that the calculated ISS Calculator liability matches your expected float schema.

Setup guide

Set up ISS Calculator 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": {
        "iss-calculator-mcp": {
            "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
        }
    }
})

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

result = await agent.run("List recent ISS Calculator 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 ISS Calculator. 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 ISS Calculator MCP in Pydantic AI

Install the package with `pip install "pydantic-ai-slim[mcp]"` to prepare your Pydantic AI agent for the ISS Calculator MCP. Use the `MCPToolset` class with the HTTP URL of your ISS Calculator host, and pass it to your Pydantic AI agent in the `toolsets` list.

The Pydantic AI framework validates every ISS Calculator tax rate and liability calculation against strict Pydantic models at runtime. This prevents silent corruption and ensures your Pydantic AI agent never processes malformed ISS Calculator tax data.

The ISS Calculator integration with Pydantic AI supports both Streamable HTTP and SSE transports. Note that the ISS Calculator tax tool must be running as an external service for the Pydantic AI toolset to connect.

Yes, the HTTP connection class is deprecated in Pydantic AI, so you should use the unified `MCPToolset` approach to connect your ISS Calculator agent. This ensures your Pydantic AI agent uses the most up-to-date connection methods for ISS Calculator.

The ISS Calculator MCP only processes raw numeric inputs, municipal codes, and service categories for your Pydantic AI agent. No proprietary business data or customer identities are shared, and all ISS Calculator validation occurs locally within your Pydantic AI runtime environment.

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