Is io.github.conorbronsdon/substack-mcp safe to use?

io.github.conorbronsdon/substack-mcp has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.

How do I install io.github.conorbronsdon/substack-mcp?

io.github.conorbronsdon/substack-mcp supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.

What can io.github.conorbronsdon/substack-mcp do?

io.github.conorbronsdon/substack-mcp provides 11 tools: get_subscriber_count, list_published_posts, list_drafts, get_post, get_draft and 6 more. See the full tools list on the server page for descriptions and parameters.

What AI clients work with io.github.conorbronsdon/substack-mcp?

io.github.conorbronsdon/substack-mcp is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.

Is io.github.conorbronsdon/substack-mcp actively maintained?

io.github.conorbronsdon/substack-mcp is actively maintained — last commit was 20 days ago. It has 9 GitHub stars.

io.github.conorbronsdon/substack-mcp

npm

Substack MCP server: posts are draft-only by design; short-form Notes publish immediately.

9 14.9M/wk 11 tools GitHub npm

No known CVEs

No license

Actively maintained

Last commit 20d ago

Works with most clients

Transport: stdio, sse, http

11 tools · ~458 tok

Grade A · 0.2% of 200K ctx

Edit this pageView history

Data

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, sse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "substack": {
      "env": {
        "SUBSTACK_USER_ID": "your-user-id",
        "SUBSTACK_SESSION_TOKEN": "your-session-token",
        "SUBSTACK_PUBLICATION_URL": "https://yourblog.substack.com"
      },
      "args": [
        "-y",
        "@conorbronsdon/substack-mcp"
      ],
      "command": "npx"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/io-github-conorbronsdon-substack-mcp)](https://mcppedia.org/s/io-github-conorbronsdon-substack-mcp)

Read me

What io.github.conorbronsdon/substack-mcp does

An MCP server for Substack. Read your publication data and manage drafts from your AI agent. Long-form posts are draft-only by design — no publish, no delete. Short-form Notes publish immediately.

Test This Server

Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.

npx -y 'npm' 2>&1 | head -1 && echo "✓ Server started successfully"

After testing, let us know if it worked:

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

89/100across 5 weighted dimensions

How we score →

0255075100

−11

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

8 fixed

CVE-2022-29244high · fixedCVSS 7.5

Packing does not respect root-level ignore files in workspaces

### Impact `npm pack` ignores root-level `.gitignore` & `.npmignore` file exclusion directives when run in a workspace or with a workspace flag (ie. `--workspaces`, `--workspace=<name>`). Anyone who has run `npm pack` or `npm publish` with workspaces, as of [v7.9.0](https://github.com/npm/cli/releases/tag/v7.9.0) & [v7.13.0](https://github.com/npm/cli/releases/tag/v7.13.0) respectively, may be affected and have published files into the npm registry they did not intend to include. ### Patch - Up

Affected: >= 7.9.0Fixed in 8.11.0source →

CVE-2018-7408high · fixedCVSS 7.8

Incorrect Permission Assignment for Critical Resource in NPM

An issue was discovered in an npm 5.7.0 2018-02-21 pre-release (marked as "next: 5.7.0" and therefore automatically installed by an "npm upgrade -g npm" command, and also announced in the vendor's blog without mention of pre-release status). It might allow local users to bypass intended filesystem access restrictions because ownerships of /etc and /usr directories are being changed unexpectedly, related to a "correctMkdir" issue.

Affected: >= 0Fixed in 5.7.1source →

CVE-2013-4116info · fixed

Local Privilege Escalation in npm

Affected versions of `npm` use predictable temporary file names during archive unpacking. If an attacker can create a symbolic link at the location of one of these temporary file names, the attacker can arbitrarily write to any file that the user which owns the `npm` process has permission to write to, potentially resulting in local privilege escalation. ## Recommendation Update to version 1.3.3 or later.

Affected: >= 0Fixed in 1.3.3source →

CVE-2020-15095medium · fixedCVSS 4.4

npm CLI exposing sensitive information through logs

Versions of the npm CLI prior to 6.14.6 are vulnerable to an information exposure vulnerability through log files. The CLI supports URLs like `<protocol>://[<user>[:<password>]@]<hostname>[:<port>][:][/]<path>`. The password value is not redacted and is printed to stdout and also to any generated log files.

Affected: >= 0Fixed in 6.14.6source →

CVE-2019-16777high · fixedCVSS 7.7

npm Vulnerable to Global node_modules Binary Overwrite

Versions of the npm CLI prior to 6.13.4 are vulnerable to a Global node_modules Binary Overwrite. It fails to prevent existing globally-installed binaries to be overwritten by other package installations. For example, if a package was installed globally and created a `serve` binary, any subsequent installs of packages that also create a `serve` binary would overwrite the first binary. This will not overwrite system binaries but only binaries put into the global node_modules directory. This b

Affected: >= 0Fixed in 6.13.4source →

Inventory

Tools (11)

Click any tool to inspect its schema.

~458 tokens total

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is io.github.conorbronsdon/substack-mcp safe to use?: io.github.conorbronsdon/substack-mcp has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.
How do I install io.github.conorbronsdon/substack-mcp?: io.github.conorbronsdon/substack-mcp supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can io.github.conorbronsdon/substack-mcp do?: io.github.conorbronsdon/substack-mcp provides 11 tools: get_subscriber_count, list_published_posts, list_drafts, get_post, get_draft and 6 more. See the full tools list on the server page for descriptions and parameters.
What AI clients work with io.github.conorbronsdon/substack-mcp?: io.github.conorbronsdon/substack-mcp is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
Is io.github.conorbronsdon/substack-mcp actively maintained?: io.github.conorbronsdon/substack-mcp is actively maintained — last commit was 20 days ago. It has 9 GitHub stars.

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Community

Discussion

Start a conversation

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Has anyone used this with Cursor?How do you handle auth?Any alternatives?

Edit this pageView history

Data

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, sse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "substack": {
      "env": {
        "SUBSTACK_USER_ID": "your-user-id",
        "SUBSTACK_SESSION_TOKEN": "your-session-token",
        "SUBSTACK_PUBLICATION_URL": "https://yourblog.substack.com"
      },
      "args": [
        "-y",
        "@conorbronsdon/substack-mcp"
      ],
      "command": "npx"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/io-github-conorbronsdon-substack-mcp)](https://mcppedia.org/s/io-github-conorbronsdon-substack-mcp)

Read me

What io.github.conorbronsdon/substack-mcp does

An MCP server for Substack. Read your publication data and manage drafts from your AI agent. Long-form posts are draft-only by design — no publish, no delete. Short-form Notes publish immediately.

Test This Server

Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.

npx -y 'npm' 2>&1 | head -1 && echo "✓ Server started successfully"

After testing, let us know if it worked:

README

substack-mcp

An MCP server for Substack. Read your publication data and manage drafts from your AI agent. Long-form posts are draft-only by design — no publish, no delete. Short-form Notes publish immediately.

An MCP server for Substack that lets AI assistants read your publication data and manage drafts. The draft list shown in the demo above is sample data, not real account values.

Safe by design — with one loud exception: This server cannot publish or delete long-form posts. Post tools create and edit drafts only; you review and publish manually through Substack's editor. The exception is Substack Notes: create_note and create_note_with_link publish short-form Notes immediately, because Notes have no draft state on Substack. Treat the Note tools as public-publish actions — there is no preview step and no undo from this server.

About

Built and maintained by Conor Bronsdon for the Chain of Thought podcast production workflow, where it drafts and reviews newsletter posts before a human hits publish. Conor hosts Chain of Thought, a show about AI infrastructure and how practitioners actually build with it. More tools for creators live in ai-tools-for-creators. Find Conor on X at @ConorBronsdon.

Sibling MCP servers:

Transistor-MCP: manage podcast episodes, analytics, and transcripts on Transistor.fm
podcastindex-mcp: search the Podcast Index and track guest appearances

Tools

Every tool declares MCP tool annotations: reads carry readOnlyHint: true, draft/upload writes carry readOnlyHint: false, and the Note tools additionally carry openWorldHint: true so clients don't treat an immediate public publish as a low-stakes write.

Read

Tool	Description
`get_subscriber_count`	Get your publication's current subscriber count
`list_published_posts`	List published posts with pagination
`list_drafts`	List draft posts
`get_post`	Get full content of a published post by ID
`get_draft`	Get full content of a draft by ID
`get_post_comments`	Get comments on a published post

Write (drafts and uploads — nothing goes public)

Tool	Description
`create_draft`	Create a new draft from markdown
`update_draft`	Update an existing draft (unpublished only)
`upload_image`	Upload an image to Substack's CDN

Publish (Notes — public immediately)

Tool	Description
`create_note`	Publish a Substack Note (short-form, publishes immediately)
`create_note_with_link`	Publish a Note with a link

... View full README on GitHub

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

89/100across 5 weighted dimensions

How we score →

0255075100

−11

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

8 fixed

CVE-2022-29244high · fixedCVSS 7.5

Packing does not respect root-level ignore files in workspaces

Affected: >= 7.9.0Fixed in 8.11.0source →

CVE-2018-7408high · fixedCVSS 7.8

Incorrect Permission Assignment for Critical Resource in NPM

Affected: >= 0Fixed in 5.7.1source →

CVE-2013-4116info · fixed

Local Privilege Escalation in npm

Affected: >= 0Fixed in 1.3.3source →

CVE-2020-15095medium · fixedCVSS 4.4

npm CLI exposing sensitive information through logs

Affected: >= 0Fixed in 6.14.6source →

CVE-2019-16777high · fixedCVSS 7.7

npm Vulnerable to Global node_modules Binary Overwrite

Affected: >= 0Fixed in 6.13.4source →

Inventory

Tools (11)

Click any tool to inspect its schema.

~458 tokens total

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is io.github.conorbronsdon/substack-mcp safe to use?: io.github.conorbronsdon/substack-mcp has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.
How do I install io.github.conorbronsdon/substack-mcp?: io.github.conorbronsdon/substack-mcp supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can io.github.conorbronsdon/substack-mcp do?: io.github.conorbronsdon/substack-mcp provides 11 tools: get_subscriber_count, list_published_posts, list_drafts, get_post, get_draft and 6 more. See the full tools list on the server page for descriptions and parameters.
What AI clients work with io.github.conorbronsdon/substack-mcp?: io.github.conorbronsdon/substack-mcp is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
Is io.github.conorbronsdon/substack-mcp actively maintained?: io.github.conorbronsdon/substack-mcp is actively maintained — last commit was 20 days ago. It has 9 GitHub stars.