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Facebook Publisher Skill (Automate Page Posts via Graph API)

Facebook Graph API Skill (Advanced)

Purpose

Production-oriented guide for building Facebook Graph API workflows for Pages: publishing posts (text + image), managing tokens, and operating Page content safely using direct HTTPS calls.

Best fit

• Page posting automation with images (DALL-E generated or external URL)
• Token management (short-lived → long-lived → page token)
• Retry-safe, rate-limit-aware production pipelines

Not a fit

• Personal profile posting (not supported by Graph API for third-party apps)
• Ads / Marketing API workflows
• Browser-based OAuth flows

Quick orientation

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agents/fb_token_helper.py     ← Get & exchange tokens (run this first!)
agents/fb_publisher_agent.py  ← Post text / images to Page
config.py                     ← All env vars
test_fb_connection.py         ← Verify token is working

Token Flow

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Short-lived User Token (1-2h)
        ↓  GET /oauth/access_token?grant_type=fb_exchange_token
Long-lived User Token (60 days)
        ↓  GET /me/accounts
Page Access Token (never expires*)

*Until user changes password or revokes app.

Required Environment Variables

env

FB_APP_ID=...           # From Meta for Developers
FB_APP_SECRET=...       # App secret
FB_PAGE_ID=...          # Target Fanpage ID
FB_PAGE_ACCESS_TOKEN=... # From fb_token_helper.py

Key API Endpoints

Post text

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POST /v21.0/{page_id}/feed
  message=...
  access_token={page_token}

Upload photo (unpublished)

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POST /v21.0/{page_id}/photos
  url={image_url}
  published=false
  access_token={page_token}
→ Returns: { "id": "PHOTO_ID" }

Post with photo

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POST /v21.0/{page_id}/feed
  message=...
  attached_media[0]={"media_fbid":"PHOTO_ID"}
  access_token={page_token}

Scheduled post

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POST /v21.0/{page_id}/feed
  message=...
  scheduled_publish_time={unix_timestamp}
  published=false
  access_token={page_token}

Required Permissions

Permission	Purpose
pages_manage_posts	Create/edit posts
pages_read_engagement	Read reactions, comments
pages_show_list	List managed pages
public_profile	Basic user identity

Rate Limits

• 200 calls/hour/user token
• Implement retry with exponential backoff (see fb_publisher_agent.py)
• POST 4-5 times/day max per Page for safety

Security

• Never log tokens or app secrets
• Store all secrets in .env (ignored by git)
• Validate webhook signatures if using webhooks
• Monitor token validity daily with a cron job