name: substack-publisher description: Publish newsletter articles to Substack as drafts. Use when "publish to substack", "create substack draft", "post newsletter to substack", "substack draft". allowed-tools: Read, Glob, Bash, AskUserQuestion

Substack Publisher

What This Does

Takes a Markdown newsletter article and creates a beautiful draft in Substack, preserving all formatting (headers, bold, tables, code blocks, links). You review the draft in Substack, add images, and publish when ready.

Prerequisites

One-Time Setup

1. Set a password on your Substack account (if using magic links):

   • Go to Substack Settings → Account → Set password

2. Add environment variables to ~/.zshrc:

   export SUBSTACK_EMAIL="your-email@example.com"
   export SUBSTACK_PASSWORD="your-password"
   export SUBSTACK_PUBLICATION_URL="https://thelittlebluereport.substack.com"
   

3. Reload shell: source ~/.zshrc

4. Install the library (first time only):

   pip install python-substack
   

Verify Setup

Run the auth check before first use:

python3 ~/Documents/GitHub/powerhouse-lab/skills/substack-publisher/tools/check_auth.py

Instructions

PHASE 1: Locate the Article

When user says "publish to substack" or similar:

1. If they provide a file path, use that
2. If they mention an article name, search Zettelkasten:

   /Users/eddale/Documents/COPYobsidian/MAGI/Zettelkasten/
   

3. Look for files starting with "Newsletter Draft -" or matching their description

Read the file to confirm it's the right article.

PHASE 2: Extract Metadata

Parse the article for:

Title: Look for first # Heading or use filename (minus date) Subtitle: Look for second ## Heading or first bold line after title Body: Everything after the subtitle

If frontmatter exists (between --- markers), extract:

• title:
• subtitle:
• Any other metadata

PHASE 3: Preview (Dry Run)

Show the user what will be created:

Ready to create Substack draft:

Title: [extracted title]
Subtitle: [extracted subtitle]
Body preview: [first 150 characters]...

Word count: [X] words
Estimated read time: [X] minutes

PHASE 4: Confirm

Use AskUserQuestion to confirm before creating the draft.

Ask: "Create this draft in Substack?"

• Options: "Yes, create draft" / "Edit title/subtitle first" / "Cancel"

If they want to edit, let them provide new title/subtitle, then confirm again.

PHASE 5: Create Draft

Run the publish script:

python3 ~/Documents/GitHub/powerhouse-lab/skills/substack-publisher/tools/publish_draft.py \
  --file "/path/to/article.md" \
  --title "The Title" \
  --subtitle "The Subtitle"

Parse the output for the draft URL.

PHASE 6: Report Success

Tell the user:

Draft created successfully!

View your draft: [URL]

Next steps:
1. Open the link above
2. Add any images
3. Preview and publish when ready

Error Handling

Examples

User: "Hey, publish my newsletter about the 45 minutes to 45 seconds thing"

Claude:

1. Searches Zettelkasten for matching file
2. Finds "Newsletter Draft - 45 Minutes to 45 Seconds - 2026-01-15.md"
3. Extracts title: "45 Minutes to 45 Seconds"
4. Extracts subtitle: "45 Minutes of Prep Work. Done in 45 Seconds."
5. Shows preview, asks for confirmation
6. Creates draft, returns URL

User: "Create a substack draft from ~/Documents/article.md"

Claude:

1. Reads the specified file
2. Extracts metadata
3. Confirms with user
4. Creates draft

Roadmap

Current (MVP):

• Markdown → Substack draft
• Title/subtitle extraction
• Dry-run confirmation

Planned:

• Image uploading
• One-click publish (skip draft)
• Scheduling posts
• Audience targeting (free vs paid)