presskit-mcp
This server does not currently have a deployable release on Glama. Follow the repository's setup instructions to install and configure it for your MCP client, including any required credentials and local dependencies.
presskit-mcp
A Python FastMCP server and CLI for publishing to Medium and Substack.
Stability warning: Both integrations rely on unofficial/deprecated access paths. Medium's REST API is frozen (no new tokens issued). Both platforms' internal endpoints are undocumented and may change without notice.
Install
pip install -e .This installs two commands:
presskit— CLI for direct publishing from the terminalpublishing-mcp— MCP server for use with Claude Desktop/Claude Code
Related MCP server: substack-mcp
CLI Usage (presskit)
Publish a markdown file
# Publish to Medium as a draft
presskit publish medium --file docs/drafts/my-article.md
# Publish to Substack as a draft
presskit publish substack --file docs/drafts/my-article.md
# Publish to both platforms at once
presskit publish both --file docs/drafts/my-article.md
# Publish live (not draft)
presskit publish medium --file article.md --status public --tags "python,automation"
# Substack: publish to web only (no subscriber email)
presskit publish substack --file article.md --status public --no-emailThe CLI reads YAML frontmatter from the markdown file:
---
title: "My Article Title"
subtitle: "Optional subtitle for Substack"
tags: [python, automation, infrastructure]
---
# My Article Title
Article body here...If no frontmatter title is present, the first # Heading is used.
List posts
# List your Medium posts
presskit list medium --username alexander.g.moore1
# List Substack posts
presskit list substack --subdomain alexgmoore
# List Substack drafts
presskit drafts substackCLI options reference
presskit publish <platform> [options]
--file, -f Markdown file to publish (required)
--status, -s draft | public | unlisted (default: draft)
--tags, -t Comma-separated tags, e.g. "python,devops" (Medium)
--subtitle Post subtitle (Substack)
--no-email Publish to web only, skip subscriber email (Substack)
presskit list <platform> [options]
--username, -u Medium username without @ (Medium)
--subdomain, -d Substack subdomain (Substack)
--limit, -n Max results (default: 10)
presskit drafts substackMCP Server Usage
Run the server
# Direct
python server.py
# Or via installed entry point
publishing-mcpAdd to Claude Code (project-level)
Create .claude/mcp.json in your project:
{
"mcpServers": {
"publishing": {
"command": "python3",
"args": ["/absolute/path/to/presskit-mcp/server.py"],
"env": {
"MEDIUM_SESSION_COOKIE": "your_sid_cookie",
"MEDIUM_AUTH_STATE_FILE": "/path/to/medium-auth.json",
"SUBSTACK_EMAIL": "you@example.com",
"SUBSTACK_PASSWORD": "your_substack_password",
"SUBSTACK_PUBLICATION_URL": "https://yourpub.substack.com"
}
}
}
}Add to Claude Desktop
Edit ~/Library/Application Support/Claude/claude_desktop_config.json (Mac):
{
"mcpServers": {
"publishing": {
"command": "python",
"args": ["/absolute/path/to/presskit-mcp/server.py"],
"env": {
"MEDIUM_SESSION_COOKIE": "your_sid",
"MEDIUM_AUTH_STATE_FILE": "/path/to/medium-auth.json",
"SUBSTACK_EMAIL": "you@example.com",
"SUBSTACK_PASSWORD": "your_password",
"SUBSTACK_PUBLICATION_URL": "https://yourpub.substack.com"
}
}
}
}Restart Claude Desktop/Code after adding the config.
FastMCP Development & Testing
presskit-mcp is built on FastMCP. Here's how to work with it during development.
Inspect tools interactively
The MCP Inspector opens a browser UI where you can call any tool, see inputs/outputs, and debug:
# Using the mcp CLI (installed with mcp[cli])
mcp dev server.pyThis starts the server and opens an interactive inspector at http://localhost:5173. You can:
Browse all 15 registered tools
Fill in parameters and execute them
See JSON responses in real-time
Test error handling
Run the server with stdio transport (default)
# FastMCP defaults to stdio transport (what Claude Desktop/Code expects)
python server.pyRun with SSE transport (for remote/HTTP access)
# Start as an HTTP server on port 8000
mcp run server.py --transport sse --port 8000Then connect from any MCP client using http://localhost:8000/sse.
Call a tool directly via mcp call
# One-shot tool invocation without starting a persistent server
echo '{"username": "alexander.g.moore1", "limit": 5}' | \
mcp call server.py medium_list_postsList all registered tools
mcp tools server.pyEnvironment variables for testing
# Medium (session-based — no integration token needed)
export MEDIUM_SESSION_COOKIE="your_sid_value"
export MEDIUM_AUTH_STATE_FILE="/path/to/medium-auth.json"
# Medium (REST API — only if you have an existing token)
export MEDIUM_INTEGRATION_TOKEN="your_token"
# Substack
export SUBSTACK_EMAIL="you@example.com"
export SUBSTACK_PASSWORD="your_password"
export SUBSTACK_PUBLICATION_URL="https://yourpub.substack.com"Running tests
python3 -m unittest discover -s tests -vTests use sys.modules patching to stub third-party deps — no external services needed.
Tools Reference
Medium (6 tools)
Tool | Auth | Method |
| Integration token | REST API |
| Integration token | REST API |
| Integration token | REST API |
| Session cookie | GraphQL + Delta OT |
| Session cookie | Unofficial GraphQL |
| Session cookie | Unofficial GraphQL |
Substack (9 tools)
Tool | Auth | Method |
| Email/password or cookie | python-substack |
| Email/password or cookie | python-substack |
| None (public) | Raw HTTP |
| None (public) | Raw HTTP |
| None (public) | Raw HTTP |
| Email/password or cookie | python-substack |
| Email/password or cookie | python-substack |
| Email/password or cookie | python-substack |
| Email/password or cookie | python-substack |
Credentials
Medium session cookie
Medium no longer issues API tokens. The session-based tools use browser cookies:
Log in to medium.com in a browser
Extract the
sidcookie from DevTools → Application → CookiesFor full functionality, save the complete browser state with
playwright-cli state-save medium-auth.jsonand setMEDIUM_AUTH_STATE_FILE
Substack
Use your Substack email and password directly. If your account uses magic links only:
Sign out of Substack
Click "Sign in with password"
Click "Set a new password"
Architecture
presskit-mcp/
├── server.py # FastMCP server entry point (15 tools)
├── cli.py # CLI entry point (presskit command)
├── medium/
│ ├── client.py # REST API + GraphQL + Delta OT HTTP layer
│ └── tools.py # 6 MCP tools with Pydantic input models
├── substack/
│ ├── client.py # python-substack wrapper + raw HTTP
│ └── tools.py # 9 MCP tools with Pydantic input models
├── tests/
│ └── test_static.py # Unit tests (no external deps needed)
├── pyproject.toml # pip installable, entry points
└── config.yaml # Credential reference (not loaded by code)How Medium session publishing works
Medium's web editor saves content via a delta-based Operational Transform system — not GraphQL or REST. The medium_create_post_session tool replicates this:
GraphQL
createPost→ creates an empty draft, returnspost_idPOST /p/{post_id}/deltas→ writes title + paragraphs as OT deltasGraphQL
setPostTags→ sets up to 5 tagsGraphQL
publishPost→ publishes (optional)
This was discovered by decompiling Medium's Android APK and capturing network traffic from the web editor.
Known limitations
Medium session cookies expire — you'll need to refresh
medium-auth.jsonperiodically (re-login via browser)Medium REST API — No new integration tokens. Only existing holders can use
medium_create_postMedium inline formatting — Bold/italic markup positions in the delta API need accurate character offsets; the current markdown parser sends plain text paragraphs
Substack — No official API. All endpoints are reverse-engineered. Keep requests under 1/sec
Images — Neither platform supports programmatic inline image upload via these tools yet
Tool Schema Changelog
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
Loading tool schema changelog…
This server cannot be deployed
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