How to Use the Substack MCP in Mastra AI

Q: Can I use Substack and mastra-ai to track content changes?

You can build a monitoring loop using listposts within your workflow. The agent checks for new posts or changed stats over time, keeping your system current.

Q: How is data privacy handled with Substack and mastra-ai?

The server touches subscriber metadata via listsubscribers, but it only provides identifiers. It never exposes private messages or payment credentials; you just get the list.

Build reliable Substack workflows with mastra-ai and guaranteed retries.

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Works with every AI agent you already use

…and any MCP-compatible client

MCP Servers — Included with Plan

Connect Substack MCP to Mastra AI

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

GDPR Included with Plan

Setup Substack with Mastra AI

Ask AI about this MCP

ChatGPT

Claude

Perplexity Vinkius runs on Gemini

Gemini

Grok

Multi-Step Content Auditing

You can build a workflow that checks post status across multiple steps. For instance, if the initial `get_post` call fails due to throttling, the system automatically retries using exponential backoff. The agent handles the failure so you don't have to write complex retry logic.

Managing Substack Content Pipelines

A developer can chain actions: first calling `get_leaderboard` for high-level metrics, then using that data to call `list_posts`. If the second step fails, the workflow doesn't halt; it notifies an admin and waits for a retry command. This makes your backend code much more stable.

Automated Substack Subscriber Checks

Want to ensure subscriber data is always current? You set up a repeating workflow using `list_subscribers`. The agent checks the count, and if it dips below a threshold (say, 100), it automatically triggers an alert. This complex process runs reliably in the background.

Setup guide

Set up Substack 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 Substack 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: "substack-mcp-client",
  servers: {
    "substack-mcp": {
      url: new URL(
        "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
      ),
    },
  },
});

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

const result = await agent.generate(
  "List recent Substack transactions"
);
console.log(result.text);

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Common questions about Substack MCP in Mastra AI

Mastra AI's built-in workflow engine handles this automatically. If a tool call fails—say, `get_post_stats` times out—the system retries the operation using backoff logic before failing entirely.

It primarily uses post metadata (titles, IDs) and subscriber identifiers. The server exposes read-only tools that your agent calls to execute the workflow steps.

Absolutely. You can build intricate multi-step processes, like 'Get publication info -> List posts -> Get stats' — and if any link breaks, the workflow recovers.

You can build a monitoring loop using `list_posts` within your workflow. The agent checks for new posts or changed stats over time, keeping your system current.

The server touches subscriber metadata via `list_subscribers`, but it only provides identifiers. It never exposes private messages or payment credentials; you just get the list.

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