Facebook Marketplace

OpenTabs plugin for Facebook Marketplace — gives AI agents access to Facebook Marketplace through your authenticated browser session.

Install

opentabs plugin install facebook-marketplace
opentabs start  # restart if it's already running

From source (for development):

git clone https://github.com/nikhilweee/opentabs-plugin-facebook-marketplace.git
cd opentabs-plugin-facebook-marketplace
npm install && npm run build   # auto-registers in ~/.opentabs/config.json

Setup

1. Open facebook.com in Chrome and log in.
2. Open the OpenTabs side panel — the Facebook Marketplace plugin should appear and you can flip it from Off to Ask.

Tools

Marketplace (6)

| Tool | Description | Type | | ---------------- | --------------------------------------------------------------------------------------------------------------- | ----- | | my_listings | Returns the current user's Marketplace listings (id, title, price, location, image, sold status, listing date). | Read | | get_listing | Given a listing id, returns full details: title, price, description, photos, location, seller, condition. | Read | | edit_listing | Updates text fields (title, price, description, condition) on one of the user's own listings. Returns updated. | Write | | create_listing | Publishes a new "Item for sale" listing. Uploads photos (base64 input), then fires the create mutation. | Write | | delete_listing | Permanently deletes one of the user's listings. Irreversible. Returns the deleted id + remaining count. | Write | | relist_listing | Deletes a listing and recreates it with the same content (re-uploaded photos). Optional field overrides. | Write |

How It Works

This plugin runs inside your Facebook Marketplace tab through the OpenTabs Chrome extension. It uses your existing browser session — no API tokens or OAuth apps required.

Under the hood it talks to Facebook's internal GraphQL endpoint (/api/graphql/) using auth tokens extracted from the page session. Persisted-query doc_ids are resolved at runtime so they survive FB's frequent client deploys. my_listings cursor-paginates through the seller's listing connection; get_listing merges every SSR-prefetched Relay fragment that references the target id.

License

MIT