7 free, MIT-licensed skills that turn Claude Code, Codex, Cursor or any skills-compatible agent into a Substack writing partner. They write Notes, outline newsletter issues from your own material, find titles people open and audit why a publication isn't growing. Your agent's own model runs them: no API keys, no accounts, nothing phones home. They draft; you publish on Substack.
npx skills add liftli-ai/substack-agent-skillsOr as a Claude Code plugin:
/plugin marketplace add liftli-ai/substack-agent-skills/plugin install substack-agent-skills@liftli-substack● MIT license · runs on your agent's model · github.com/liftli-ai/substack-agent-skills
A skill is an installable instruction package: a SKILL.md your agent reads and runs with its own model. Installing one teaches your agent a Substack craft: Notes that stand on their own in the feed, an issue built on one structure instead of three, a subtitle that pays off the title instead of repeating it.
New here? Ask your agent "help me with my Substack". The substack-agent skill picks the right skill, and substack-voice builds a voice file from three of your own pieces so every draft sounds like you. It is the same voice file the LinkedIn agent skills read, so you build it once.
The skills write and check; they never post. Substack has no public API for publishing, so each skill ends with copy-ready text you paste into Substack. Install everything with the command above, or a single skill with --skill <name>. Every card below carries its exact command.
substack-agentSubstack Agent
The front door to the kit: routes any Substack request to the right skill, sets up the voice file first, and suggests a weekly routine of one issue plus a few Notes.
npx skills add liftli-ai/substack-agent-skills --skill substack-agentsubstack-voiceSubstack Voice File
Builds a voice file from three of the user's own pieces and four short questions. It is the same .liftli/voice.md the LinkedIn skills read, with a short section for how they sound in a newsletter.
npx skills add liftli-ai/substack-agent-skills --skill substack-voicesubstack-notes-writerSubstack Notes Writer
Five Substack Notes of different types (teach, behind the scenes, question, shift, proof, invite), each with one goal, a first line that earns the stop, and no link-dumping.
npx skills add liftli-ai/substack-agent-skills --skill substack-notes-writersubstack-issue-outlinerSubstack Issue Outliner
Picks one of five newsletter issue structures, maps the user's own material onto each section, and turns every gap into a question instead of inventing filler.
npx skills add liftli-ai/substack-agent-skills --skill substack-issue-outlinersubstack-subject-line-generatorSubstack Subject Line Generator
8 labeled title and subtitle pairs that work as email subject line plus inbox preview, with character counts, the best two picked, and the reasons.
npx skills add liftli-ai/substack-agent-skills --skill substack-subject-line-generatorlinkedin-to-substackLinkedIn to Substack
Turns a LinkedIn post into Substack Notes or a full newsletter issue section with room to argue the case. Strips the LinkedIn habits and keeps the user's facts exact.
npx skills add liftli-ai/substack-agent-skills --skill linkedin-to-substacksubstack-growth-auditSubstack Growth Audit
A 20-point publication checklist: About page, welcome email, Recommendations, cadence, the Notes habit and outside distribution. Scored, with a short fix list ordered for the user's stage.
npx skills add liftli-ai/substack-agent-skills --skill substack-growth-auditSkills are stateless: your agent brings the model, the skill brings the craft. What they can't know is you: your publication's promise, your strategy, last month's material, which issues landed. That is Liftli for Substack. It connects to Claude or ChatGPT as one MCP URL, keeps a separate strategy for your Substack, drafts newsletter issues and Notes in your voice, and critiques each draft before you use it. It does not publish to Substack: you paste the draft and press publish. The Substack MCP page explains why, and compares the community servers that do post.
Few open-source Substack skill collections exist yet. Star counts are as of 14 October 2026.
| Repository | Stars | What it covers | Posts to Substack? |
|---|---|---|---|
| liftli-ai/substack-agent-skills (this page) | new | 7 skills: a router, a voice file shared with the LinkedIn set, Notes, issue outlines, titles and subtitles, a 20-point growth audit, LinkedIn to Substack. MIT. | No. Copy-ready text you paste. |
| Arin117Kaushik/substack-skills | 3 | 11 skills: Notes, posts with SEO packaging, repurposing, a humanizer, an interviewer, reply drafts, segment campaigns, About page audits, analytics recaps and a content planner. MIT. | Yes, through a publisher skill that runs a local script with your Substack cookies, after an approval card. |
| liftli-ai/linkedin-agent-skills | new | The LinkedIn sibling: 31 skills for posts, hooks, comments, profile audits and pre-publish checks, on the same voice file. MIT. | Not Substack. LinkedIn through Liftli's official API connection, after you approve. |
They are plain markdown files, so you can mix them. If you want your agent to post to Substack from chat, that takes an MCP server signed in with your session; see the Substack MCP comparison for what that involves.
A Substack strategy that carries over between chats, issues and Notes drafted from your real week, and a critique before you publish. You paste and press publish.
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