LessWrong's RSS feed includes all recently published articles by default, but it has a bunch of undocumented features available with query params:

You can request only posts above a certain karma (karmaThreshold), only with certain authors (userId), frontpage only (view=frontpage), curated-only (view=curated), and several other views.
- Just the frontpage: https://www.lesswrong.com/feed.xml?view=frontpage
- My posts: https://www.lesswrong.com/feed.xml?userId=piR3ZKGHEp6vqTo87[1]
Comments have RSS feeds (type=comment, view=postCommentsNew, postId, parentCommentId if you want only replies to a specific comment)
- Comments on this post: https://www.lesswrong.com/feed.xml?type=comments&view=postCommentsNew&postId=dzF8vSdDtmWjCBBDr[2]
Quick takes / shortform have an RSS feed (view=shortform, view=topShortForm or view=shortformFrontpage)
- Quick takes front page: https://www.lesswrong.com/feed.xml?type=comments&view=shortformFrontpage
- My shortform: https://www.lesswrong.com/feed.xml?type=comments&view=shortform&userId=6jLdWqegNefgaabhr

Somewhat surprisingly, the number of articles returned is not configurable and is hard-coded at 10 for posts and 50 for comments.

There's also a full GraphQL API if you have needs beyond this, but the RSS feed is nice if you want it to work in a normal feed reader.

LessWrong RSS Feed Builder

Since there's a lot of options, I also built a tool to generate LessWrong RSS feed URLs.

Full Documentation

Note: This was generated by Claude after reading the source code for feed.xml and related utility code.

Query Parameters

ParameterTypeDescriptiontypestringSet to comments for comment feeds, otherwise returns postsviewstringFeed [...]

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Outline:

(01:26) LessWrong RSS Feed Builder

(01:47) Full Documentation

(01:58) Query Parameters

(02:14) Post Feed Views

(02:38) Comment Feed Views

(02:49) General

(03:04) Per-Post (require postId)

(03:30) Per-User

(03:45) Shortform / Quick Takes

(04:02) Per-Tag (require tagId)

(04:19) sortBy Values

(04:38) Karma Threshold Logic

The original text contained 2 footnotes which were omitted from this narration.

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First published:
February 23rd, 2026

Source:
https://www.lesswrong.com/posts/dzF8vSdDtmWjCBBDr/secrets-of-the-lesswrong-rss-feed

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Images from the article:

“Secrets of the LessWrong RSS Feed” by Brendan Long

LessWrong (30+ Karma)