Can Antigravity Post to Instagram and TikTok Automatically? — Building an SNS Marketing Automation Pipeline

One of the most common questions I get from solo developers is: "Can Antigravity automatically post to Instagram and TikTok for me?" The short answer is yes — but there are real API constraints worth understanding before you dive in.

This guide builds a working pipeline from scratch, and stays honest about what's achievable versus what's overhyped. If you've been manually posting app release announcements at odd hours, this is for you.

Instagram Auto-Posting — Know the API Limits First

Automatic Instagram posting goes through the Meta Graph API. The critical caveat: personal accounts are not supported. You need a Business or Creator account linked to a Facebook Page.

What you can automate as of 2026:

• Feed posts: Images and videos, with captions and hashtags
• Reels: Video content up to 15 minutes
• Stories: Images and short videos
• Scheduling logic: You handle the timing in your own code — the API itself is fire-and-forget

What you cannot automate:

• Personal account posting: Business/Creator only
• Native scheduled drafts: The API publishes immediately; scheduling requires your own cron or workflow tool

Start by creating an app at Meta for Developers and requesting these permissions:

• instagram_basic
• instagram_content_publish
• pages_read_engagement

Writing the Instagram Agent in Antigravity

With your credentials in place, here's a minimal Python implementation that accepts an image URL and publishes it to your feed:

import requests
import os
 
INSTAGRAM_ACCOUNT_ID = os.environ["INSTAGRAM_ACCOUNT_ID"]
ACCESS_TOKEN = os.environ["META_ACCESS_TOKEN"]
 
def post_to_instagram(image_url: str, caption: str) -> dict:
    """
    Post an image to an Instagram feed.
    image_url: Publicly accessible URL (Cloudflare R2 or S3 recommended)
    caption: Post text including hashtags
    Returns: {"id": "media_post_id"} or raises on error
    """
    base = f"https://graph.facebook.com/v20.0/{INSTAGRAM_ACCOUNT_ID}"
 
    # Step 1: Create the media object
    media_res = requests.post(
        f"{base}/media",
        params={
            "image_url": image_url,
            "caption": caption,
            "access_token": ACCESS_TOKEN,
        },
    )
    media_res.raise_for_status()
    creation_id = media_res.json()["id"]
 
    # Step 2: Publish the media object
    publish_res = requests.post(
        f"{base}/media_publish",
        params={
            "creation_id": creation_id,
            "access_token": ACCESS_TOKEN,
        },
    )
    publish_res.raise_for_status()
    return publish_res.json()
 
 
# Expected output: {"id": "17841400045678901"}
if __name__ == "__main__":
    result = post_to_instagram(
        image_url="https://pub-xxxx.r2.dev/promo-image.jpg",
        caption="New feature just dropped! #indiedev #appdev #antigravity",
    )
    print(result)

The two-step flow (create → publish) trips up a lot of people the first time. You can't publish in a single API call — the creation_id from the first request is required for the second.

In Antigravity, store your credentials in a .env file at the project root. The agent will pick them up automatically via os.environ.

TikTok Auto-Posting — Content Posting API

TikTok offers a Content Posting API that supports video and image (carousel) uploads. The important note: access requires manual approval. Register your app at TikTok for Developers and request the video.upload scope. Approval typically takes a few business days.

import requests
import os
 
TIKTOK_ACCESS_TOKEN = os.environ["TIKTOK_ACCESS_TOKEN"]
 
def post_video_to_tiktok(video_url: str, title: str) -> dict:
    """
    Post a video to TikTok using the Direct Post method.
    video_url: Publicly accessible .mp4 URL
    title: Post description and hashtags (max 2,200 characters)
    Returns: {"publish_id": "..."} or raises on error
    Note: Access token must be obtained via OAuth 2.0 PKCE flow
    """
    headers = {
        "Authorization": f"Bearer {TIKTOK_ACCESS_TOKEN}",
        "Content-Type": "application/json; charset=UTF-8",
    }
 
    payload = {
        "post_info": {
            "title": title,
            "privacy_level": "PUBLIC_TO_EVERYONE",
            "disable_duet": False,
            "disable_comment": False,
            "disable_stitch": False,
        },
        "source_info": {
            "source": "PULL_FROM_URL",
            "video_url": video_url,
        },
    }
 
    res = requests.post(
        "https://open.tiktokapis.com/v2/post/publish/video/init/",
        headers=headers,
        json=payload,
    )
    res.raise_for_status()
    return res.json().get("data", {})

The biggest operational pain point I ran into was token lifecycle management. TikTok access tokens expire after 24 hours, and you'll need to implement refresh token rotation for unattended operation. Don't skip this — your pipeline will silently fail otherwise.

Scheduling With n8n

Once the posting code works, you need something to trigger it on a schedule. Rather than running Antigravity agents on a bare cron, combining them with n8n for workflow automation gives you a visual editor and easy retry logic.

A practical n8n flow:

1. Cron node: Fires at 8:00 AM daily
2. Function node: Reads a post queue file that Antigravity generated in batch
3. HTTP Request node: Calls your Instagram or TikTok function endpoint

Antigravity's background agent feature pairs well here: run a weekly agent session to generate all post captions and stage image URLs into a queue file, then let n8n drain the queue one post at a time throughout the week.

Operational Gotchas

Rate limits: Instagram's Content Publishing API caps you at 25 posts per hour. That's generous for most solo developers, but hitting it during testing locks you out for the remainder of the hour.

Account standing: Posting in rapid bursts or repeating identical hashtag sets across every post increases the risk of account restrictions. Keep the cadence close to what a human would do.

Image rights: Even if Antigravity generates the code that calls an image generation API, you're responsible for verifying commercial use rights for the generated assets. Check the terms of each service you integrate.

Token hygiene: Never hardcode access tokens in your source files. Use Antigravity's .antigravityignore to exclude .env files, and store secrets in Cloudflare Workers secrets or your CI environment.

Start With One Successful Post This Week

The pipeline itself isn't complicated — the friction is almost entirely in initial API setup and credential management. Get a single successful Instagram test post working first, then expand to TikTok once your workflow is stable.

TikTok API approval can take a few days, so use that time to nail down the core agent workflow design so you're ready to plug in the TikTok endpoint the moment it's approved.

Once both platforms are connected and posting automatically, the next natural step is piping analytics back into Antigravity to understand which posts drive the most app installs — closing the loop from content creation to growth measurement.