How to Use the Google Pub/Sub Subscription MCP in Pydantic AI

Use Pydantic AI with Google Pub/Sub Subscription to enforce strict data validation on every message your agent processes.

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Connect Google Pub/Sub Subscription MCP to Pydantic AI

Create your Vinkius account to connect Google Pub/Sub Subscription 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 Google Pub/Sub Subscription with Pydantic AI

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Perplexity

Type-safe pulling with Pydantic AI

The `pull_messages` tool fetches your data, and Pydantic AI ensures it matches your expected schema. If the message doesn't fit your model, the agent halts before it can act on bad data. This prevents the common issue of agents hallucinating fields or failing silently. You define exactly what the message should look like, and the framework enforces it at runtime.

Strict message acknowledgment in Pydantic AI

Once your logic validates the message, use `acknowledge_messages` to clear it. This ensures your agent only marks tasks as done when they meet your specific data requirements. It keeps your workflow predictable. If a message fails your validation, it stays in the queue, allowing you to investigate the malformed data later.

Standardized MCP Server interface

The server provides a clean, predictable interface for your agent. You connect via the MCPToolset and immediately gain access to the defined tools for interacting with your infrastructure. It works across any model you choose. Whether you are using local models or cloud-based ones, the communication remains consistent and strictly typed.

Setup guide

Set up Google Pub/Sub Subscription 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": {
        "google-pubsub-subscription-mcp": {
            "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
        }
    }
})

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

result = await agent.run("List recent Google Pub/Sub Subscription 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 Google Pub/Sub Subscription. 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 Google Pub/Sub Subscription MCP in Pydantic AI

You initialize an MCPToolset with the HTTP endpoint of the server. Pydantic AI then registers the tools for use in your agent logic.

You get runtime validation for every message. If a message is missing fields or has the wrong type, your agent catches it immediately.

You can connect multiple MCP instances to your agent. Each instance can be configured to point at a unique subscription for specialized tasks.

The agent throws a validation error. The message remains in the subscription because you did not call the acknowledgment tool.

The server acts as a thin pass-through. It reads the message body and transmits it to your agent via the MCP protocol, which you secure with standard authentication tokens.

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