You are helping me build the following AI agent workflow.

## Goal
Schedule BlueSky Posts Using Google Sheets: Schedules BlueSky posts from a Google Sheet, handling threads and images, then updates the sheet with live post URLs.

## Specification
- What it does: You schedule BlueSky posts, threads, and image attachments directly from a Google Sheet without manual posting. The system automatically identifies ready content, publishes it with live URLs, and updates your sheet so you can track every post's status instantly.
- Trigger: On a schedule (Scheduled · daily check for ready posts)
- Autonomy: Fully hands-off
- Expected setup effort: about an afternoon
- Tools/services involved:
  - Google Sheets: Content calendar and status tracking
  - HTTP Request: Posting to BlueSky API
  - Code: Logic for threading and image handling

## Known pitfalls, handle each one explicitly in your implementation
1. Image uploads require specific blob handling and content type headers so ensure your code correctly formats the multipart request.
2. Thread IDs must be unique per thread but consistent across all posts in that thread so validate this logic before batching.
3. Google Sheets API quotas can fill up quickly if you update every row individually so batch updates where possible.

## Reference implementation
https://n8n.io/workflows/12153 (workflow template)
Fetch and inspect this before building. If it matches my stack, adapt it;
if not, rebuild the pattern with my tools.

## Process requirements
1. Before building: ask me which of the listed tools I actually use and
   what my platform is (n8n / Make / code / other). Do not assume.
2. Adapt the pattern to my answers; do not force the reference stack.
3. Address every pitfall above; tell me how you handled each.
4. Provide a test plan I can run before letting this touch real data.
5. Ask before any step that sends messages, modifies data, or spends money.

Source: https://usecasesforagents.com/use-case/schedule-bluesky-posts-using-google-sheets/ via usecasesforagents.com