How to Use the GoBolt MCP in Pydantic AI

Q: How do I register the GoBolt MCP Server with Pydantic AI?

Install the library with pip install "pydantic-ai-slimmcp". Use the MCPToolset constructor with your GoBolt server URL, and pass the toolset into your Pydantic AI Agent instance.

Q: How do I update a shipping order safely in Pydantic AI?

Use the modifyshippingorder tool. Pydantic AI ensures the modified address or package dimensions match your defined schema before sending the update to the carrier.

Build type-safe shipping workflows with Pydantic AI and GoBolt to guarantee clean data on every delivery.

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Connect GoBolt MCP to Pydantic AI

Create your Vinkius account to connect GoBolt 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 GoBolt with Pydantic AI

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Type-safe rate calculation with Pydantic AI

The GoBolt MCP Server integrates with Pydantic AI to ensure every shipping rate output matches your exact data schemas. When your agent runs `get_shipping_rates`, the response is validated at runtime before it reaches your business logic. If a carrier returns malformed rate data, Pydantic AI raises a validation error immediately. This keeps your checkout flow safe from corrupt pricing when comparing carriers with `find_cheapest_rate`.

Strict order validation and creation

This MCP Server enforces rigid data structures when your Pydantic AI agent books a shipment. The agent uses `create_shipping_order` to send shipping details, which must pass strict type checks before the order is placed. If the agent attempts to pass an invalid zip code, the validation layer catches it before hitting the carrier API. Once validated, the agent runs `get_shipping_labels` to fetch the printable label.

Guaranteed tracking data structures

Your Pydantic AI agent tracks packages with absolute structural certainty. The agent calls `track_shipment` to get the current status, mapping the response directly to your internal database models. When digging into delivery delays, the agent runs `get_tracking_history` to analyze each transit event. This structured output ensures your notification systems never crash due to unexpected null fields from carrier updates.

Setup guide

Set up GoBolt 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": {
        "gobolt-mcp": {
            "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
        }
    }
})

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

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

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Common questions about GoBolt MCP in Pydantic AI

Install the library with `pip install "pydantic-ai-slim[mcp]"`. Use the `MCPToolset` constructor with your GoBolt server URL, and pass the toolset into your Pydantic AI `Agent` instance.

Pydantic AI validates all incoming tool data at runtime. If `get_shipping_rates` returns a field that violates your schema, the framework triggers a validation error, preventing silent failures.

Yes. Pydantic AI is model-agnostic, allowing your GoBolt MCP Server to work with OpenAI, Anthropic, or local models while maintaining strict type-safety for tools like `create_shipping_order`.

Use the `modify_shipping_order` tool. Pydantic AI ensures the modified address or package dimensions match your defined schema before sending the update to the carrier.

The GoBolt MCP Server handles credential authentication and processes shipping labels within Vinkius's secure, ephemeral sandbox. Raw PDF data and merchant keys never touch the LLM's prompt context directly.

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