Facebook Lyr

facebook-lyr

A Facebook / Messenger MCP server for AI agents — profile & page reads, post and comment search, groups, Messenger, notifications, events, and multi-account + Page switching, all through the same session your browser already has. No Graph API app, no tokens, no browser automation.

curl -fsSL https://raw.githubusercontent.com/ishan-parihar/facebook-lyr/main/install.sh | bash

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What it does

• Read & discover — profiles, Pages, timeline posts, post details & comments, groups (+ members), people/page/group/post search, Messenger conversations & messages, notifications, and upcoming events.
• Write & engage — text / photo / video / carousel posts, delete your own posts, save & unsave posts, comment on posts, and full Messenger operations (send, delete/unsend, typing indicator, mark-seen).
• Multi-account — store multiple identities (your user, Pages you administer, linked profiles), each with its own cookie set; switch the active identity any time, discover switchable accounts, import cookies per identity, and enforce per-identity posting limits + cooldowns + attempt history.
• Agent-first CLI — AXI-compliant, TOON output, session hooks for Claude Code / Codex, and a self-installing agent skill.

Modeled directly on instagram-lyr — the same architecture, CLI conventions, and browser-cookie authentication flow. Threads lives in a separate project (threads-lyr).

Why cookie scraping?

The official Graph API requires a Meta developer app, app review, and page-scoped tokens — and it cannot see anything your app wasn't granted. Cookie scraping reuses the exact session your browser has, so the agent reads and acts on Facebook the way you would: full timelines, groups, Messenger inboxes, notifications, and events.

• curl_cffi with Chrome TLS impersonation defeats JA3 fingerprint detection.
• The fb_dtsg CSRF token is extracted from the logged-in homepage and auto-refreshed on rotation.
• Messenger uses the legacy Mercury ajax endpoints (threadlist_info.php, thread_info.php, send_messages.php, delete_messages.php) where they still exist.
• Feeds, profiles, notifications, events, and search are parsed from Facebook's embedded JSON with a resilient recursive deep-scan — no fragile selectors.
• Account discovery reads the relay data on /accounts/ to list every Page / profile the session can switch to.

Quick install

One-line installation (clones to ~/projects/facebook-lyr):

curl -fsSL https://raw.githubusercontent.com/ishan-parihar/facebook-lyr/main/install.sh | bash

Or install from PyPI with uv (no clone):

uv tool install facebook-lyr

Or in any MCP client — just point it at the package:

{
  "mcpServers": {
    "facebook": {
      "command": "uvx",
      "args": ["facebook-lyr"]
    }
  }
}

Quick start

uv sync                        # install dependencies (repo install)
facebook-lyr --login           # import cookies from your browser (Brave, Chrome, Edge, Firefox, Zen, ...)
facebook-lyr --status          # "status: valid" when the session works
facebook-lyr                   # start the MCP server (stdio)

Headless agents (no interactive step): export the session directly —

export FACEBOOK_COOKIES='{"c_user":"12345","xs":"abc...","fr":"...","datr":"..."}'
facebook-lyr --status

Cookies are stored at ~/.facebook-lyr/profile/cookies.json (mode 0600) and never leave your machine.

Tool surface (41 tools)

Read & discover

Tool	What it gives you
get_me / get_account_status	Authenticated identity + session validity
get_user_posts / get_page_posts	Recent timeline posts for a user or Page
get_page_info / get_profile-style info	Profile / Page summary (bio, follower counts)
get_post_details / get_post_comments	Single post + its comments
search_posts / search_people / search_pages / search_groups	Keyword discovery across Facebook
get_group / get_group_posts / get_group_members	Group metadata, feed, and member list
get_conversations / get_conversation_messages	Messenger inbox + thread bodies
get_notifications	New alerts (messages, tags, follows, page activity)
get_events	Upcoming events for the identity
get_account_posting_status	Posting limits + attempt history for an identity

Write & engage

Every write tool is confirm-gated (confirm=true), respects the identity's daily cap + cooldown, and records the attempt in the identity's posting history.

Tool	Notes
create_post	Text post (≤ 5000 chars)
create_photo_post	Image (file/URL), normalized to feed spec
create_video_post	Video (file/URL) — best-effort
create_carousel_post	2–10 image carousel
delete_post	Delete one of your own posts (delete.php)
save_post / unsave_post	Bookmark / un-bookmark a post
comment_on_post	Comment on a post
send_message / delete_message	Send, or delete/unsend, a Messenger message
send_typing_indicator / mark_conversation_seen	Presence writes (no quota)

Accounts & identity

Tool	What it gives you
list_accounts / get_active_account_info	Stored identities + which is active
list_switchable_accounts	Every Page/profile the session can switch to
add_account / remove_account / update_account_cookies	Manage per-identity cookie stores
import_account_from_browser	Import an identity's cookies from a browser
switch_active_account / set_active_page	Change the identity every tool acts as
close_session	Release active clients

Authentication

• Interactive: facebook-lyr --login — imports c_user, xs, fr, datr, … from your browser's cookie store (Brave, Chrome, Edge, Firefox, Zen, Chromium, Opera, Arc, Vivaldi, LibreWolf, Waterfox, Floorp, and more).
• Headless: FACEBOOK_COOKIES env var (JSON object with at least c_user and xs).
• If the session expires (login wall / 403), tools auto-trigger re-login and tell you to run --login.

Multi-account (users + Pages)

Store multiple identities — your user account, Pages you administer, linked profiles — each with its own cookie set under ~/.facebook-lyr/accounts/<id>/:

facebook-lyr import_account_from_browser --account_id 100064606727322 --name "My Page" --browser zen
facebook-lyr switch_active_account --account_id 100064606727322
facebook-lyr get_active_account_info

Cookie rotations (xs/fr refreshes) are written back to the owning identity's store automatically, so stored jars stay in sync with the live session. Posting limits, cooldowns, and attempt history are tracked per identity.

Honest limitations

Facebook has been decommissioning its cookie-era write endpoints. Where a write path is dead, the tool fails loudly and honestly instead of faking success:

Capability	Status
Timeline publishing (text/photo/video/carousel) via Graph API	🟢 working — requires a page-scoped token (see below); the cookie path is decommissioned
Comment on posts / delete own posts	🟢 working (Graph API for comments, cookie delete.php for delete)
Save / unsave posts, notifications, events, group members	🟢 working (legacy endpoints still alive)
Messenger text send / delete / typing / seen	🔴 decommissioned — send_messages.php returns 404 (verified live); the read side (get_conversations) still works
React to post/comment, edit post, follow, friend requests, Messenger media/reactions	🔴 endpoint removed (404) — not possible with cookies or the current token
Post via cookies for migrated accounts	🔴 returns a clear "official API required" error

Graph API writes need a page-scoped access token, deployed as a sidecar ~/.facebook-lyr/.env:

FACEBOOK_GRAPH_API_TOKEN=...
FACEBOOK_GRAPH_API_PAGE_ID=...

When the token is present, facebook-lyr automatically routes timeline publishing + comments through the Graph API; without it, those writes fail honestly with the "official API required" error. Read tools and the messenger read side are unaffected.

CLI reference

facebook-lyr --help                 # usage
facebook-lyr --list-tools           # all 41 tools
facebook-lyr --tool-info <tool>     # params for one tool
facebook-lyr <tool> --param value   # call a tool directly (TOON output)
facebook-lyr --login | --status | --logout
facebook-lyr --install-hook         # session hooks for Claude Code / Codex
facebook-lyr --install-skill        # agent skill for auto-discovery

Development

uv sync --extra dev
uv run pytest        # 259 tests: parsers, write surface, limits, Tier-1 tools
uv run ruff check .

License

MIT — see LICENSE.

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