substack-mcp

MCP server · npm · ★ 44 · graded 2026-10-24Source linked

MCP server for Substack: rich drafts, Notes, analytics, and consented subscriber management across publications. Long-form posts stay draft-only; Notes publish immediately. Used regularly by multiple newsletters, includes a CLI.

No outside reports on file

substack-mcp reads local files; restrict its folder reach, network access, and credentials before installing.

Based on public adoption and transparency signals as of Oct 24, 2026. Our opinion, not a code audit or security guarantee.

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What it can access

Local filesReads & writes local foldersREVIEW
Command executionNo shell command runner notedLOW
Network reachConnects to outside service APINOTED
CredentialsNo API token requiredLOW
Package sourcenpm (@conorbronsdon/substack-mcp)PUBLIC

Inferred from this listing’s public package details and description. Check the project’s source before installing.

Install

npx -y @conorbronsdon/substack-mcp

All setup options ↓

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About Substack MCP

Substack MCP is an MCP server focused on Developer tools and Data & databases: MCP server for Substack: rich drafts, Notes, analytics, and consented subscriber management across publications. Long-form posts stay draft-only; Notes publish immediately. Used regularly by multiple newsletters, includes a CLI.

It is published on npm as @conorbronsdon/substack-mcp and hosted on GitHub at conorbronsdon/substack-mcp (44 GitHub stars, 502 weekly npm downloads). Based on its public metadata, its operational scope includes: reads local files.

Setup

Check these steps against the project’s own instructions before running anything.

Run @conorbronsdon/substack-mcp with --ignore-scripts in claude_desktop_config.json or .cursor/mcp.json:

json

{
  "mcpServers": {
    "substack-mcp": {
      "command": "npx",
      "args": ["-y", "--ignore-scripts", "@conorbronsdon/substack-mcp"]
    }
  }
}

Why this grade

CC — Moderate risk signals

Signal-based grade (2/7 points): listed in several sources, public source code. This reflects adoption and transparency, not a code review.

Popularity and upkeep

45/100

GitHub stars: 44
Weekly npm downloads: 502
Listing last refreshed: 2026-10-29

These are public popularity signals, not a maintenance check. Look at the repository’s commit history and open issues.

Security reports

No reports found for this package in our research (last checked 2026-10-29).

Check a specific version →

Risks to watch for

Local file read access: Reads local documents or database files. Point it only at the specific files needed for the task so sensitive workspace files remain out of reach.
Dependency & version pinning: Distributed via npm (@conorbronsdon/substack-mcp). Pin an exact release version or commit SHA rather than floating tags so upstream updates are reviewed first.

How to lower the risk

Least-privilege permissions

Give it access only to the specific folders, accounts or projects it needs, never your whole drive or admin account.
Use a separate, limited API key or login just for this tool so you can switch it off without affecting anything else.

Network isolation

Run it on a work computer or sandbox account, not one holding personal or company-sensitive data.
If your IT team can, limit which websites and services it is allowed to contact.

Monitoring

Check its activity history or logs weekly at first, and look at what it changed or sent.
Turn on alerts for new logins or unusual usage on any account it connects to.

Red flags to watch for

It asks for more access than its job requires, or prompts you to paste passwords.
It suddenly updates with new owners, or starts contacting unfamiliar websites.

Questions

How do I install Substack MCP?

Run npx -y @conorbronsdon/substack-mcp in your terminal, or add the server entry to your claude_desktop_config.json or .cursor/mcp.json as shown in the Setup section on this page. Full setup docs and environment variables are in github.com/conorbronsdon/substack-mcp.

Are there security reports about Substack MCP?

No reports found for this package in our research (last checked 2026-10-29). Substack MCP currently holds Grade C (Moderate risk signals) based on public adoption and transparency signals. Key risk areas to watch include local file read access:, dependency & version pinning:.

Is Substack MCP actively maintained?

Substack MCP has 44 GitHub stars and 502 weekly npm downloads. Our directory data was last refreshed on 2026-10-29. Check recent commit activity, release tags, and open issues at github.com/conorbronsdon/substack-mcp before pinning it in production.

What are alternatives to Substack MCP?

Compare Substack MCP side by side with similar MCP servers in the Related tools section on this page, or browse all MCP servers on AgentArmorHQ.

Maintain or use Substack MCP? Show its live grade in your GitHub README, docs site, or run a check from the terminal before you install.

AgentArmorHQ Risk Grade C for Substack MCP

GitHub README Markdown:

markdown

[![AgentArmorHQ Risk Grade for Substack MCP](https://agentarmorhq.com/api/badge/conorbronsdon-substack-mcp)](https://agentarmorhq.com/skills/conorbronsdon-substack-mcp)

HTML embed:

html

<a href="https://agentarmorhq.com/skills/conorbronsdon-substack-mcp"><img src="https://agentarmorhq.com/api/badge/conorbronsdon-substack-mcp" alt="AgentArmorHQ Risk Grade for Substack MCP" height="20" /></a>

Terminal check:

terminal

curl -fsSL https://agentarmorhq.com/api/cli | node --input-type=module - check "conorbronsdon-substack-mcp"

Share with your security lead

Need sign-off to use substack-mcp? Copy this note for Slack, a ticket or a pull request.

### AgentArmorHQ Security Review Memo: substack-mcp
- **Listing URL:** https://agentarmorhq.com/skills/conorbronsdon-substack-mcp
- **Type:** App connector
- **Risk Grade:** Grade C (Moderate risk signals)
- **Outside Security Advisories on File:** 0
- **Public Adoption:** 44 GitHub stars, 502 weekly npm downloads

#### Permission & Blast-Radius Signals
- **Local files:** Reads & writes local folders
- **Command execution:** No shell command runner noted
- **Network reach:** Connects to outside service API
- **Credentials:** No API token required
- **Package source:** npm (@conorbronsdon/substack-mcp)

#### Recommended Hardened Setup
- **Command:** `npx -y --ignore-scripts @conorbronsdon/substack-mcp`
- **Controls:** Pin an exact version in `.mcp.json`, scope access to a single workspace folder, and use a least-privilege read-only token where supported.

_Based on public adoption and transparency signals as of Oct 24, 2026. Our opinion, not a code audit or security guarantee._

Key facts

Type: App connector
Publisher: conorbronsdon
Source code: github.com/conorbronsdon/substack-mcp
Install command: npm install @conorbronsdon/substack-mcp
Est. context load: ~750 tokens / turn (~4 tool schemas, 0.38% of 200k context)
Popularity: 44 GitHub stars, 502 weekly npm downloads
Last updated: 2026-10-29
Last graded: 2026-10-24

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