Ariel — Bluesky MCP Server

Ariel is an MCP (Model Context Protocol) server that exposes AT Protocol (Bluesky) operations as tools. It enables AI assistants to read, write, and interact on Bluesky with human-in-the-loop control — nothing posts without explicit action.

Installation

npm install -g @ticktockbent/ariel

Or run directly with npx:

npx @ticktockbent/ariel

Or build from source:

git clone https://github.com/TickTockBent/ariel.git
cd ariel
npm install
npm run build

Configuration

Environment Variables

Variable	Required	Description
BLUESKY_IDENTIFIER	Yes	Your Bluesky handle or email
BLUESKY_APP_PASSWORD	Yes	A Bluesky app password
BLUESKY_SERVICE_URL	No	PDS URL (default: https://bsky.social)
ARIEL_DATA_DIR	No	Session storage directory (default: ~/.ariel/)

MCP Client Configuration

Add to your MCP client config (e.g. claude_desktop_config.json):

{
  "mcpServers": {
    "ariel": {
      "command": "npx",
      "args": ["-y", "@ticktockbent/ariel"],
      "env": {
        "BLUESKY_IDENTIFIER": "your.handle.bsky.social",
        "BLUESKY_APP_PASSWORD": "your-app-password"
      }
    }
  }
}

Tools

Ariel exposes 33 tools across six categories.

Authentication

• ariel_auth_status — Check auth state, handle, DID, and rate limits
• ariel_auth_logout — Log out and clear stored session

Reading

• ariel_get_timeline — Home timeline
• ariel_get_author_feed — A user's posts
• ariel_get_post_thread — Post with thread context
• ariel_get_posts — Multiple posts by AT URI (max 25)
• ariel_get_profile — User profile
• ariel_get_feed — Custom feed generator posts
• ariel_search_posts — Search posts
• ariel_search_users — Search users
• ariel_get_trends — Trending topics
• ariel_get_saved_feeds — Your saved/pinned feeds
• ariel_get_list — List metadata and members
• ariel_get_list_feed — Posts from a list feed
• ariel_resolve_url — Convert bsky.app URL to AT URI

Writing

• ariel_create_post — Create a post with auto-detected mentions/links/hashtags
• ariel_create_thread — Create a multi-post thread
• ariel_reply — Reply to a post (auto-resolves thread root)
• ariel_quote_post — Quote-post another post
• ariel_delete_post — Delete your post

Media

• ariel_upload_image — Upload an image blob
• ariel_create_post_with_images — Post with images (max 4)
• ariel_create_post_with_link_card — Post with Open Graph link card

Social

• ariel_follow / ariel_unfollow — Follow/unfollow users
• ariel_get_followers / ariel_get_follows — View follower/following lists
• ariel_like / ariel_unlike — Like/unlike posts
• ariel_repost / ariel_unrepost — Repost/remove reposts
• ariel_mute / ariel_unmute — Mute/unmute users
• ariel_block / ariel_unblock — Block/unblock users

Notifications

• ariel_get_notifications — Recent notifications
• ariel_get_unread_count — Unread notification count
• ariel_mark_notifications_read — Mark all notifications as read

Resources

Ariel provides three MCP resources with reference material that clients can pull into context:

• ariel://at-protocol-concepts — DIDs, handles, AT URIs, facets, embeds, and viewer state
• ariel://tool-conventions — URL acceptance, error format, the format parameter, and viewer state auto-resolution
• ariel://post-schema — Post record structure, embed types, facet format, and thread mechanics

Prompts

Three built-in prompts for common workflows:

• summarize-timeline — Fetch your home timeline and produce a thematic summary
• draft-thread — Research a topic and draft a thread for review before posting
• review-notifications — Review recent notifications and suggest responses

Development

npm run dev          # Watch mode TypeScript compilation
npm test             # Run tests
npm run build        # Production build
npm start            # Run the server

See CONTRIBUTING.md for development guidelines.

License

MIT