How to reply to a post (via API)?

[GreenFootballs]

I know I'm probably missing something obvious, but how exactly would I use the API to reply to a specific post? I assume I'd need to refer to the post's CID in a createRecord call, but how?

[snarfed]

I believe you'd include app.bsky.feed.post#replyRef in a app.bsky.feed.post, filling in parent with the post you're replying to and root to be the same as that post's root. Lexicon:

atproto/lexicons/app/bsky/feed/post.json

Lines 36 to 43 in bf4ac79

	"replyRef":{
	"type": "object",
	"required": ["root", "parent"],
	"properties": {
	"root": {"type": "ref", "ref": "com.atproto.repo.strongRef"},
	"parent": {"type": "ref", "ref": "com.atproto.repo.strongRef"}
	}
	},

More:

• example JSON: https://github.com/snarfed/granary/blob/main/granary/tests/testdata/comment_inreplyto_id.bsky.json#L7-L23
• example Python code using @MarshalX's atproto lib: https://github.com/MarshalX/atproto/blob/main/examples/send_reply.py

[dholms]

yup exactly!

& just to add on, if those post that you're replying to is not a reply itself, then both parent & root will point to the same post

[bnewbold]

FWIW, there is a longer worked example of "how to reply" in this blog post: https://atproto.com/blog/create-post