Connect Bluesky first
- 01
Create an app password in Bluesky's settings.
- 02
Open Accounts in 1Post and choose Connect, then Bluesky.
- 03
Enter your handle and the app password.
- 04
Choose the account in the composer.
Then GET /v1/accounts returns the id of the Bluesky account to use in the request.
Send a post to Bluesky
curl https://api.get1post.com/v1/posts \
-H "Authorization: Bearer $ONEPOST_API_KEY" \
-H "Idempotency-Key: bluesky-first-post" \
-d '{"accounts":["ACCOUNT_ID"],"text":"Notes from the latest release.","schedule_at":"2026-11-02T15:00:00Z"}'The reply is 202 with the post (status scheduled) and one destination for Bluesky, which moves from queued to published or failed.
What you can send to Bluesky
- Text
- Up to 4 images
- One video
- Threads
- Alt text
Bluesky rules the request is checked against
| Rule | What 1Post checks |
|---|---|
| Text limit | 300 characters, counted by the characters a reader sees |
| Media accepted | Images, Video |
| Images per post | 4 |
| Videos per post | 1 |
| Images and video together | Not in one post |
| Threads | Yes, as a chain of replies |
| First comment | Yes |
| Posts per day, per connected account (1Post) | 100 |
The same table with sources is on the Bluesky specs page.
Bluesky options in the request
- Thread: send parts instead of text. Each part is one post in the chain, up to 100 parts, and each is counted on its own.
- First comment: add first_comment with text to an account object, and delay_min if it should wait.
{
"accounts": [
"ACCOUNT_ID"
],
"parts": [
{
"text": "1/ The short version."
},
{
"text": "2/ The detail.",
"delay_min": 1
}
],
"use_next_free_slot": true
}Check the post before it is queued
Add "dry_run": true to test a post: nothing is kept, a valid one answers 200 and a broken one answers 422 naming the rule.
{
"error": {
"code": "invalid_for_platform",
"message": "bluesky refuses this post: Bluesky counts 332 of 300 characters in part 1. (text_too_long).",
"fix": "Fix the rule named in the message and send the post again.",
"retryable": false,
"request_id": "REQUEST_ID"
}
}An assistant connected to the MCP server sends the same fields to create_post; set one up.