substack-gateway-oss

MCP server · GitHub · ★ 39 · graded 2026-10-19Source linked

Stateless Substack Gateway exposing a REST API and MCP for reading profiles, posts, notes, and comments, plus authenticated personal and note-publishing workflows.

No outside reports on file

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

Based on public adoption and transparency signals as of Oct 19, 2026. Our opinion, not a code audit or security guarantee.

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What it can access

Local filesReads local filesNOTED
Command executionNo shell command runner notedLOW
Network reachLocal or standard API callsLOW
CredentialsNo API token requiredLOW
Package sourceGitHub (jakub-k-slys/substack-gateway-oss)PUBLIC

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

Install

No npm or PyPI package is listed. Install from source: github.com/jakub-k-slys/substack-gateway-oss ↗

All setup options ↓

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About Substack Gateway Oss

Substack Gateway Oss is an MCP server focused on Files & documents: Stateless Substack Gateway exposing a REST API and MCP for reading profiles, posts, notes, and comments, plus authenticated personal and note-publishing workflows.

It is hosted on GitHub at jakub-k-slys/substack-gateway-oss (39 GitHub stars). Based on its public metadata, its operational scope includes: reads local files.

Setup

These use the package this listing points to. Check the project’s own instructions before running anything.

No npm or PyPI package is listed for this MCP server. Source code and setup steps: github.com/jakub-k-slys/substack-gateway-oss.

Why this grade

DD — High risk signals

Signal-based grade (1/7 points): public source code. This reflects adoption and transparency, not a code review.

Popularity and upkeep

19/100

GitHub stars: 39
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 GitHub (jakub-k-slys/substack-gateway-oss). 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 Gateway Oss?

Substack Gateway Oss does not publish a standalone npm or PyPI package. Clone or follow the setup instructions in its source repository at github.com/jakub-k-slys/substack-gateway-oss.

Are there security reports about Substack Gateway Oss?

No reports found for this package in our research (last checked 2026-10-29). Substack Gateway Oss currently holds Grade D (High risk signals) based on public adoption and transparency signals. Review the permissions and source repository before granting access to local files, shell commands, or API keys.

Is Substack Gateway Oss actively maintained?

Substack Gateway Oss has 39 GitHub stars. Our directory data was last refreshed on 2026-10-29. Check recent commit activity, release tags, and open issues at github.com/jakub-k-slys/substack-gateway-oss before pinning it in production.

What are alternatives to Substack Gateway Oss?

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

AgentArmorHQ Risk Grade D for Substack Gateway Oss

GitHub README Markdown:

markdown

[![AgentArmorHQ Risk Grade for Substack Gateway Oss](https://agentarmorhq.com/api/badge/jakub-k-slys-substack-gateway-oss)](https://agentarmorhq.com/skills/jakub-k-slys-substack-gateway-oss)

HTML embed:

html

<a href="https://agentarmorhq.com/skills/jakub-k-slys-substack-gateway-oss"><img src="https://agentarmorhq.com/api/badge/jakub-k-slys-substack-gateway-oss" alt="AgentArmorHQ Risk Grade for Substack Gateway Oss" height="20" /></a>

Terminal check:

terminal

curl -fsSL https://agentarmorhq.com/api/cli | node --input-type=module - check "jakub-k-slys-substack-gateway-oss"

Share with your security lead

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

### AgentArmorHQ Security Review Memo: substack-gateway-oss
- **Listing URL:** https://agentarmorhq.com/skills/jakub-k-slys-substack-gateway-oss
- **Type:** App connector
- **Risk Grade:** Grade D (High risk signals)
- **Outside Security Advisories on File:** 0
- **Public Adoption:** 39 GitHub stars

#### Permission & Blast-Radius Signals
- **Local files:** Reads local files
- **Command execution:** No shell command runner noted
- **Network reach:** Local or standard API calls
- **Credentials:** No API token required
- **Package source:** GitHub (jakub-k-slys/substack-gateway-oss)

#### Recommended Hardened Setup
- **Source Repo:** https://github.com/jakub-k-slys/substack-gateway-oss
- **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 19, 2026. Our opinion, not a code audit or security guarantee._

Key facts

Type: App connector
Publisher: jakub-k-slys
Source code: github.com/jakub-k-slys/substack-gateway-oss
Est. context load: ~900 tokens / turn (~5 tool schemas, 0.45% of 200k context)
Popularity: 39 GitHub stars
Last updated: 2026-10-29
Last graded: 2026-10-19

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