mdsend 0.3.1

File-based social media publisher. Write markdown, post to LinkedIn, Bluesky, and Mastodon.

mdsend — File-based social media publisher

Write markdown posts, run mdsend, and it cross-posts to your social media platforms.

The main purpose is simple: set up a git repo with a simple directory structure and publish from it to various destinations. Your posts are in a single unified format that works across different social media platforms. You get a version-controlled archive that can be queried and managed by AI should the need arise.

Want to know what you've been focusing on, what your next posts should be, how to improve your writing, or which tags to use? Just ask your AI tool — it can read the repo and answer and provide you with a perspective.

This approach keeps you disconnected from the destination network so you don't get pulled into everyone else's feeds.

Supported platforms

Platform	Max chars	Max media	API auth
LinkedIn	3,000	1 image	OAuth 2.0 (Bearer)
Bluesky	300	4 images	AT Protocol (App Password)
Mastodon	500	4 images	OAuth (Access Token)

How it works

Each post is a directory named YYYY-MM-DD_HH-MM_slug/ containing:

• post.md — the post text (markdown or plain text)
• Optional media files (jpg, png, gif, mp4, mov)

posts/
├── 2026-05-03_15-30_my-thoughts/
│   ├── post.md
│   └── image.jpg
└── 2026-05-04_18-00_hello-world/
    └── post.md

Per-post platform targeting

By default every post goes to all platforms. To control this per post, add an optional front matter block at the top of post.md:

---
platforms: [bluesky]
---

This post will only appear on Bluesky.

---
platforms: []
---

This post is a draft — it will never be published.

Installation

pip install mdsend

Or from source:

git clone https://github.com/algodesigner/mdsend
cd mdsend
pip install -e .

Setup

Create a .env file with your API credentials:

cp .env.example .env

Fill in the credentials for the platforms you want to use. See .env.example for the full list of required fields.

Usage

# Preview what would be posted (default — no API calls made)
cd /path/to/your/posts
mdsend

# Actually post live
mdsend --publish

# Post to specific platforms
mdsend --platforms bluesky
mdsend --platforms bluesky --publish

Creating a new post

# Create a post directory and open the editor
mdsend --new "my-post-slug"

This creates a directory like 2026-05-04_21-30_my-post-slug/ with a post.md file containing a front matter template, then opens it in your $EDITOR (or vi by default).

Dry run

mdsend runs in dry-run mode by default — it prints what would be posted without calling any API. Use --publish to post live.

Multi-post threading (Bluesky & Mastodon)

Posts longer than the platform limit are automatically split into threaded replies. Each chunk is prefixed with 🧵 (n/N) so readers know it's part of a multi-part post. Media is attached to the first chunk only. Links are moved to the first chunk so the preview card appears at the top of the thread.

Idempotent publishing

Each platform gets its own sentinel file under posts/.published/. Re-running is safe — already-published platforms are skipped.

License

BSD 3-Clause. See LICENSE.

Happy microblogging! ☕