It watches the conversations your buyers already read, finds threads with real momentum and fit, drafts contribution-first replies in your voice, and gives you a review queue before anything goes live. The product is positioned as a self-serve desktop plugin: subscribe, install, connect your accounts, review the drafts, and track the results.

Website: https://s4l.ai
Pricing: https://s4l.ai/pricing
Source: https://github.com/m13v/social-autoposter

What S4L does

Most social tools start after you already know what to post. S4L starts earlier: it looks for conversations worth entering.

Finds high-traffic Reddit and X threads with enough context to join well.
Ranks opportunities by momentum, intent, community norms, and product fit.
Drafts replies that answer the thread first and mention your product only when it belongs.
Keeps project-specific voice, claim language, competitors, sensitive topics, and hard lines in the drafting context.
Presents drafts in a review workflow so you can approve, reject, or edit before posting.
Tracks views, upvotes, clicks, deletions, and misses so each run learns from the previous one.

Nothing is posted automatically by default. Posting autopilot stays off until you explicitly turn it on.

Who it is for

S4L is for founders and small teams who want an AI-assisted social workflow without handing their accounts to an agency or living inside mention alerts all day.

You bring the accounts, product context, voice, and judgment. The plugin handles thread discovery, draft generation, review cards, scheduling, and result memory.

How users install it

The production path is the desktop plugin download from S4L.

Subscribe at https://s4l.ai/pricing.
Download the plugin link emailed after checkout.
Install the plugin in Claude Desktop.
Start a new Claude chat and send:

Set me up on S4L plugin end to end

The setup flow repairs the local runtime, connects your X browser session, discovers product and voice context, seeds search topics, schedules draft generation, and verifies that draft cards appear without posting.

What is in this repo

This repository contains the open-source runtime behind the S4L plugin:

social-autoposter/
|-- mcp/                    Desktop plugin / MCP server, panel UI, release bundle
|-- scripts/                Discovery, drafting, stats, telemetry, and queue helpers
|-- skill/                  Shell entrypoints used by scheduled jobs
|-- setup/                  End-to-end setup skill used by Claude
|-- browser-agent-configs/  Browser automation profile templates
|-- launchd/                macOS LaunchAgent templates
|-- mcp-servers/            Local MCP helpers used by the runtime
|-- config.example.json     Example project/account configuration
`-- SKILL.md                Legacy social-autoposter agent playbook

The mcp/ package is the plugin users interact with. The rest of the repo is the pipeline it bundles, installs, and drives.

Architecture

Claude Desktop plugin
  -> S4L MCP server
  -> local runtime + menu bar review UI
  -> scheduled queue worker
  -> browser profiles you control
  -> S4L API for install-scoped queues, stats, and configuration

Important properties:

Runs locally on macOS.
Uses the user's own logged-in browser profiles.
Stores install state locally and scopes API calls by install identity.
Keeps secrets such as .env, config.json, browser profiles, logs, and local databases out of Git.
Uses approval-first drafting as the default operating mode.

Develop from source

For normal users, use the plugin download from S4L. These steps are for working on the repo itself.

Prerequisites:

macOS
Node.js 16+
Python 3.9+
Claude Desktop or Claude Code for MCP testing

Install dependencies:

npm install
cd mcp
npm install

Build the plugin server and panel:

cd mcp
npm run build

cd mcp
node install.mjs

Then fully quit and reopen Claude so MCP servers reload.

Run the test suite:

npm test

Build a local .mcpb artifact without publishing:

bash scripts/release-mcpb.sh --no-bump --no-npm --no-release

That command packs the current pipeline into mcp/dist/pipeline.tgz, builds the plugin, creates mcp/social-autoposter.mcpb, and runs the release checks without touching npm or GitHub releases.

Runtime commands

The plugin exposes MCP tools for the user-facing workflow:

project_config configures projects, products, voice, topics, and X auth.
engagement_mode chooses personal-brand and product-promotion lanes.
dashboard opens the review dashboard.
approve_drafts posts only the drafts the user selected.
get_stats reads X/Twitter stats.
pause_s4l pauses or resumes scheduled S4L jobs.
runtime installs, updates, and diagnoses the local runtime.
report_diagnosis sends a support report to the S4L team.

The legacy /social-autoposter skill and npm package remain in the repo because the plugin bundles and reuses the same pipeline scripts.

Public-repo hygiene

This repo is public. Do not commit local customer data, browser state, generated media, private automation experiments, .mcpb bundles, .env files, databases, or logs. The root .gitignore intentionally keeps those out of source control.

If a workflow needs private scratch space, keep it outside the repo or under an ignored directory.