Auto-comment on Instagram posts with GPT-4o, Phantombuster, and SharePoint

Description

Who’s it for
Social-media teams and influencers who want to grow engagement by
automatically posting short, relevant comments on new Instagram posts
under rotating hashtags—while staying under platform limits.

How it works / What it does
Schedule Trigger fires every 2 h at a specified minute.
Select Cookie chooses a rotating Instagram session-cookie by
time slice.
Generate Random Hashtag (GPT-4o) outputs a realistic AI/BPA tag.
Hashtag Agent (Phantombuster) scrapes up to
ENV_MAX_POSTS_PER_HASHTAG recent posts.
Get Random Post picks one; Create Comment (GPT-4o) crafts a
≤150-character reply in the chosen language.
Builds instagram_post_to_comment.csv, uploads to SharePoint, then
launches the Auto-comment Agent which posts the reply.
Post URL is logged to instagram_posts_already_commented.csv
to avoid duplicates.
Wait nodes throttle launches to ≈80 comments/day.

How to set up
Add credentials: Phantombuster API, SharePoint OAuth2, OpenAI API key.
In SharePoint › “Phantombuster” folder create:
• instagram_session_cookies.txt – one cookie per line.
• instagram_posts_already_commented.csv with header postUrl.
Edit Set ENV Variables to set default language, prompt, and max
posts per scrape.
Activate the workflow; it will comment every 2 h.

Requirements
n8n 1.33 +
Phantombuster Growth plan (API access)
OpenAI account (GPT-4o)
Microsoft 365 SharePoint tenant

How to customize
Change tone/length: tweak prompt in Create Comment.
Comment more often: raise ENV_MAX_POSTS_PER_HASHTAG,
adjust cron, and agent limits.
Swap SharePoint for Drive/Dropbox by replacing storage nodes.