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

Q: Can I use human-in-the-loop approval before calling acknowledgemessages in Mastra AI?

Yes. You can configure Mastra to require approval for the acknowledgemessages tool, letting you inspect the pulled payload before removing it from Google Cloud.

Run reliable, event-driven Mastra AI workflows that pull and commit Google Pub/Sub messages automatically.

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Connect Google Pub/Sub Subscription MCP to Mastra AI

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

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Workflow integration for Mastra AI

Your agent uses `pull_messages` to grab pending work directly inside your custom Mastra steps. This lets you build complex multi-step pipelines that trigger based on queue data. If a step fails, Mastra's built-in retry engine handles the error gracefully. Only after the workflow completes successfully does the agent run `acknowledge_messages` to safely remove the message from your GCP queue.

Reliable MCP Server message commits

This MCP Server provides direct access to `acknowledge_messages` so your workflow engine can commit changes only after validation. Handing off queue items to autonomous workers is risky without strict confirmation steps. You can configure human-in-the-loop approvals in your framework before executing the tool, ensuring sensitive message queues aren't cleared by mistake. Your production workflows stay safe and predictable.

Single-subscription polling loops

The `pull_messages` tool targets a specific subscription, allowing your Mastra agent to run continuous polling loops. By focusing on a single queue, you prevent memory bloat and keep your background worker architecture simple. Debugging becomes straightforward when your agent isn't distracted by unrelated topics. You write less boilerplate code and get faster execution times.

Setup guide

Set up Google Pub/Sub Subscription 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 Subscription 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-subscription-mcp-client",
  servers: {
    "google-pubsub-subscription-mcp": {
      url: new URL(
        "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
      ),
    },
  },
});

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

const result = await agent.generate(
  "List recent Google Pub/Sub Subscription 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 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 Mastra AI

Mastra manages the workflow state. If a run fails, the message remains unacknowledged; once retries succeed, the agent calls `acknowledge_messages` to finalize the transaction.

Yes. You can configure Mastra to require approval for the `acknowledge_messages` tool, letting you inspect the pulled payload before removing it from Google Cloud.

No. This specific server connects to a single subscription to keep operations secure and isolated. You deploy one instance per queue to maintain clean architectural boundaries.

Use the Mastra MCP client to connect to the SSE endpoint. Spread the returned tools directly into your agent's tool array so it can access the queue.

Yes. Your raw message payloads and ack IDs are processed entirely within ephemeral memory. The Vinkius sandbox ensures zero persistent storage of your GCP data.

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