How do I get my Substack API token?

Log in to your Substack publication at **yourdomain.substack.com**. Navigate to **Settings** from the left sidebar. Look for the **Publication API** or **Developer** section. Generate an API token and copy it. Paste it into the configuration field below. Note: Substack's API is currently in limited availability — check Substack's developer page for the latest access information.

Can I draft and schedule newsletter posts?

Yes. Your AI agent can create draft posts with title, body content, subtitle, and metadata. You can then schedule them for a specific date and time — managing your entire editorial calendar conversationally.

Can I track how many subscribers I gained this month?

Yes. Ask your AI agent for subscriber growth metrics and get total subscribers, new subscribers this month, churn rate, and free vs. paid subscriber breakdown.

Does this work with paid Substack publications?

Yes. The integration supports both free and paid publications. You can manage paywalled content, check paid subscriber counts, and analyze revenue metrics through your AI agent.

Substack MCP Server for LlamaIndex 6 tools — connect in under 2 minutes

Name: Substack
Availability: InStock
Author: Vinkius

docs.llamaindex.ai/en/stable/module_guides/tools/mcp

Built by Vinkius GDPR 6 Tools Framework

LlamaIndex specializes in data-aware AI agents that connect LLMs to structured and unstructured sources. Add Substack as an MCP tool provider through Vinkius and your agents can query, analyze, and act on live data alongside your existing indexes.

Get MCP Server for AI Agents

ASK AI ABOUT THIS MCP SERVER

Open in ChatGPT Open in Claude Open in Perplexity

Vinkius supports streamable HTTP and SSE.

python

import asyncio
from llama_index.tools.mcp import BasicMCPClient, McpToolSpec
from llama_index.core.agent.workflow import FunctionAgent
from llama_index.llms.openai import OpenAI

async def main():
    # Your Vinkius token. get it at cloud.vinkius.com
    mcp_client = BasicMCPClient("https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp")
    mcp_tool_spec = McpToolSpec(client=mcp_client)
    tools = await mcp_tool_spec.to_tool_list_async()

    agent = FunctionAgent(
        tools=tools,
        llm=OpenAI(model="gpt-4o"),
        system_prompt=(
            "You are an assistant with access to Substack. "
            "You have 6 tools available."
        ),
    )

    response = await agent.run(
        "What tools are available in Substack?"
    )
    print(response)

asyncio.run(main())

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* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure

About Substack MCP Server

Connect Substack to your AI agent and manage your newsletter publication conversationally.

LlamaIndex agents combine Substack tool responses with indexed documents for comprehensive, grounded answers. Connect 6 tools through Vinkius and query live data alongside vector stores and SQL databases in a single turn. ideal for hybrid search, data enrichment, and analytical workflows.

What you can do

Post Management — List, create, and manage newsletter posts including drafts, published, and scheduled content.
Subscriber Insights — Query subscriber counts, growth trends, and audience demographics.
Publication Settings — Access and modify publication metadata, categories, and custom domains.
Content Analytics — Track open rates, click rates, and engagement metrics per post.

The Substack MCP Server exposes 6 tools through the Vinkius. Connect it to LlamaIndex in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

How to Connect Substack to LlamaIndex via MCP

Follow these steps to integrate the Substack MCP Server with LlamaIndex.

Install dependencies

Run pip install llama-index-tools-mcp llama-index-llms-openai

Replace the token

Replace [YOUR_TOKEN_HERE] with your Vinkius token

Run the agent

Save to agent.py and run: python agent.py

Explore tools

The agent discovers 6 tools from Substack

Why Use LlamaIndex with the Substack MCP Server

LlamaIndex provides unique advantages when paired with Substack through the Model Context Protocol.

Data-first architecture: LlamaIndex agents combine Substack tool responses with indexed documents for comprehensive, grounded answers

Query pipeline framework lets you chain Substack tool calls with transformations, filters, and re-rankers in a typed pipeline

Multi-source reasoning: agents can query Substack, a vector store, and a SQL database in a single turn and synthesize results

Observability integrations show exactly what Substack tools were called, what data was returned, and how it influenced the final answer

Substack + LlamaIndex Use Cases

Practical scenarios where LlamaIndex combined with the Substack MCP Server delivers measurable value.

Hybrid search: combine Substack real-time data with embedded document indexes for answers that are both current and comprehensive

Data enrichment: query Substack to augment indexed data with live information before generating user-facing responses

Knowledge base agents: build agents that maintain and update knowledge bases by periodically querying Substack for fresh data

Analytical workflows: chain Substack queries with LlamaIndex's data connectors to build multi-source analytical reports

Substack MCP Tools for LlamaIndex (6)

These 6 tools become available when you connect Substack to LlamaIndex via MCP:

get_leaderboard

Get leaderboard

get_post

Get post

get_post_stats

Get post stats

get_publication_info

Get publication info

list_posts

List recent posts

list_subscribers

List subscribers

Example Prompts for Substack in LlamaIndex

Ready-to-use prompts you can give your LlamaIndex agent to start working with Substack immediately.

"How many subscribers does my Substack have?"

"Draft a new newsletter post titled 'The Future of AI in Sales'."

"What was the open rate on my last newsletter?"

Troubleshooting Substack MCP Server with LlamaIndex

Common issues when connecting Substack to LlamaIndex through the Vinkius, and how to resolve them.

BasicMCPClient not found

Install: pip install llama-index-tools-mcp

Substack + LlamaIndex FAQ

Common questions about integrating Substack MCP Server with LlamaIndex.

How does LlamaIndex connect to MCP servers?

Use the MCP client adapter to create a connection. LlamaIndex discovers all tools and wraps them as query engine tools compatible with any LlamaIndex agent.

Can I combine MCP tools with vector stores?

Yes. LlamaIndex agents can query Substack tools and vector store indexes in the same turn, combining real-time and embedded data for grounded responses.