How to Use the Google Pub/Sub Topic MCP in Mastra AI

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Connect Google Pub/Sub Topic MCP to Mastra AI

Create your Vinkius account to connect Google Pub/Sub Topic to Mastra AI — we handle the hosting, security, and runtime updates so you don't have to. No server setup required.

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Setup Google Pub/Sub Topic with Mastra AI

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Implementing Reliable Pub/Sub Triggers for Mastra AI

Mastra AI can now trigger cloud events reliably using this MCP Server. The `pubsub_publish_message` tool ensures that publishing a message to the Google Pub/Sub Topic is treated as a critical, verifiable step in your workflow. Because Mastra AI supports automatic retries and exponential backoff, if the first attempt fails due to transient network issues, it will automatically try again until the write succeeds.

Using MCP Server for Controlled Cloud Messaging

You can embed `pubsub_publish_message` into a complex workflow that requires human oversight. By using Mastra AI's `requireToolApproval`, you force a manual check before the message hits the Google Pub/Sub Topic. This is key when sending messages related to financial transactions, ensuring a person reviews the payload before it becomes an event.

Integrating Pub/Sub Topics into Mastra AI Workflows

The tool makes publishing simple: you just pass the message content and topic name. This allows your agent to perform complex actions, like 'Check Payment Status' followed by 'Notify System via Topic'. Mastra AI handles the entire sequence, guaranteeing that if the notification fails, it will log the error and attempt recovery.

Setup guide

Set up Google Pub/Sub Topic MCP in Mastra AI

Prerequisites

Node.js 18+ and a TypeScript project
@mastra/mcp + @mastra/core packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run npm install @mastra/mcp @mastra/core plus your preferred model provider (e.g. @ai-sdk/openai).
2

Configure the MCPClient
Create an MCPClient with your Vinkius endpoint as a URL object. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Discover and inject tools
Call mcpClient.listTools() and spread the result into your agent's tools object. All Google Pub/Sub Topic tools become native Mastra tools.
4

Run with any model
Swap openai("gpt-4o") for any AI SDK-compatible provider. Call agent.generate() and the agent routes tool calls through MCP automatically.

agent.ts

import { MCPClient } from "@mastra/mcp";
import { Agent } from "@mastra/core/agent";
import { openai } from "@ai-sdk/openai";

const mcpClient = new MCPClient({
  id: "google-pubsub-topic-mcp-client",
  servers: {
    "google-pubsub-topic-mcp": {
      url: new URL(
        "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
      ),
    },
  },
});

const agent = new Agent({
  name: "Google Pub/Sub Topic Agent",
  model: openai("gpt-4o"),
  instructions: "You have access to Google Pub/Sub Topic tools.",
  tools: {
    ...(await mcpClient.listTools()),
  },
});

const result = await agent.generate(
  "List recent Google Pub/Sub Topic transactions"
);
console.log(result.text);

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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 Topic. 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 Topic MCP in Mastra AI

Mastra AI treats this MCP as a core step in its workflow engine. You define a sequence, and the agent uses `pubsub_publish_message` to ensure messages hit the topic exactly when needed.

Yes, this is one of its strengths. If publishing fails for any reason, Mastra AI's built-in retry logic takes over, attempting the publication again until success or until the defined failure limit is reached.

The tool itself publishes messages independently. However, Mastra AI's workflow engine allows you to sequence actions, giving you high-level control over the *order* in which events are initiated.

You should wrap the publishing action within a workflow that requires human approval. This ensures that before any message related to billing hits the topic, an operator signs off on it.

It handles string payloads for both the required Google Pub/Sub Topic name and the actual message body being published. These are plain text strings.

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