Lab sweep — every run, no rotation

A real research radar checks the labs themselves every single day. This sweep is mandatory on every daily run and is separate from (and in addition to) the rotating exploration slot. Official lab/vendor blogs are primary sources under the Hard rules, so anything found here is citable evidence.

The CHECK (fetch every feed and see what is new since the last scan) is owed on EVERY run, even one minute after another pass — it is cheap triage and may never be skipped as a "light pass". Only the EXTRACT (open a new post in full) is conditional on a genuinely new entry.

Method (efficient)

1. For each source in the list, fetch its FEED first (RSS/Atom), not the HTML

index — feeds are immune to the JS-rendering that hid lmsys.org/blog. To find a feed: try /rss.xml, /feed, /atom.xml, /index.xml, or read the page's <link rel="alternate" type="application/rss+xml">.

1. Open only entries dated AFTER the last daily scan (check the previous date in

logs/source_rotation.md). Skip everything older — this keeps the sweep cheap.

1. Apply the evidence rules: open the actual post, cite its own date, match to a

trend or log to observation_queue/study_shelf as appropriate.

1. Log the sweep in logs/source_rotation.md every run, even when nothing is new

("lab-sweep: no new posts").

Source list

The list lives in SOURCES.md → "Lab & big-tech AI blogs" (agent-owned: mark feeds DEAD if they stop resolving, add new labs as they appear). Prefer the feed URL; fall back to the HTML index via tvly extract only if no feed exists.

Notes

• The sweep complements, never replaces, the rotating exploration slot.
• Big-tech AI blogs often announce model/open-weight releases that never become

arXiv papers — those announcements are exactly what this sweep exists to catch.

• Keep this list in sync with any unified source registry if one is introduced.