diff --git a/plugins/linkedin-studio/commands/video.md b/plugins/linkedin-studio/commands/video.md
index 97246ff..a9416b5 100644
--- a/plugins/linkedin-studio/commands/video.md
+++ b/plugins/linkedin-studio/commands/video.md
@@ -94,8 +94,9 @@ Delegate script generation to the `video-scripter` agent — invoke it via `Task
 
 Before presenting, verify the script passes the video quality gate:
 
-**The 3-Second Test:**
-- [ ] Hook grabs attention in first 3 seconds (8 words or fewer)
+**The Muted-Autoplay Test:**
+- [ ] Opening front-loads value for muted autoplay — ~85% watch without sound (the "three-second hook" is cross-platform folklore, not a LinkedIn signal; LinkedIn's only official "3 seconds" is the minimum video length)
+- [ ] First line reads on-screen as text/caption, not only when spoken
 - [ ] No "Hey everyone" or "So today I'm going to talk about..."
 
 **Natural Speech Test:**
@@ -114,7 +115,7 @@ Before presenting, verify the script passes the video quality gate:
 - [ ] Energy peaks at hook and takeaway
 
 **Completeness Test:**
-- [ ] Captions written and synced
+- [ ] Captions written and synced — the enforceable spec (~80–85% watch muted; caption text is indexed for search/discovery). Accept SRT upload OR LinkedIn native auto-captions
 - [ ] Post caption (200-400 chars) included
 - [ ] Thumbnail suggestion included
 - [ ] First comment pre-written
@@ -202,7 +203,8 @@ Before you record:
 - [ ] Read the script aloud once (practice run)
 - [ ] Set up lighting (natural light facing window, or ring light)
 - [ ] Check audio (lavalier mic or quiet room)
-- [ ] Vertical format: 9:16 (1080×1920) for LinkedIn vertical feed (3-4x watch duration vs landscape)
+- [ ] Aspect ratio: 4:5 (1080×1350) or 1:1 for broad feed distribution; reserve 9:16 for the opt-in vertical video tab (it crops to 1:1 on desktop)
+- [ ] Export as MP4 (H.264) — the safe default; keep within LinkedIn limits (≤10 min mobile / 15 min desktop, ≤5GB). MOV/AVI is warn-only — re-encode to MP4 if unsure
 - [ ] Clean background
 - [ ] Have captions tool ready (CapCut, Descript, or Kapwing)
 - [ ] First comment ready to paste immediately after posting
diff --git a/plugins/linkedin-studio/references/linkedin-formats.md b/plugins/linkedin-studio/references/linkedin-formats.md
index 7e1db75..b02908c 100644
--- a/plugins/linkedin-studio/references/linkedin-formats.md
+++ b/plugins/linkedin-studio/references/linkedin-formats.md
@@ -58,9 +58,9 @@ Choosing the right format isn't just about engagement rates—it's about underst
    - **Critical:** 30% minimum completion rate or video gets zero distribution
    - LinkedIn Live: 12-24x engagement vs standard posts
    - 85% watch without sound (captions essential)
-   - **Vertical 9:16 (1080×1920)** now gets distribution boost (3-4x watch duration vs landscape). 4:5 still acceptable but deprioritized
-   - First 3 seconds determine 70% of retention — 3-second hook is critical
-   - Note: Overall video reach down 72% YoY — but good video is rewarded more than ever
+   - **4:5 (1080×1350) or 1:1 (1080×1080) preferred** for broad feed distribution on a desktop-heavy professional audience. 9:16 is delivered mobile-only and crops to 1:1 on desktop; its "distribution boost" is an uncorroborated heuristic — no official 4:5-vs-9:16 engagement study exists. Reserve 9:16 for the opt-in vertical video tab
+   - Front-load value for muted autoplay — ~85% watch without sound. The "three-second hook" is cross-platform folklore, not a LinkedIn-named signal; LinkedIn's only official "3 seconds" is the minimum video length
+   - Note: per-video organic reach is declining year-over-year; documents/carousels currently out-engage video — use video when it adds something text can't
    - Best for: Personal stories, quick insights, behind-the-scenes
    - See "Video Content Deep Dive" section below for comprehensive guidance
 
@@ -533,12 +533,12 @@ Video isn't the silver bullet many creators think it is. Text-based thought lead
 ### Technical Specifications
 
 **Video Format & Resolution:**
-- **Aspect ratio:** Vertical 9:16 (1080x1920) now gets distribution boost in LinkedIn's immersive feed
-  - Vertical 9:16: 1080x1920px (optimal for 2026 — 3-4x watch duration vs landscape, 100% mobile viewport)
-  - Vertical 4:5: 1080x1350px (still acceptable)
-  - Square 1:1: 1080x1080px (deprioritized)
-  - If using 16:9: 1920x1080px minimum (only 25% of mobile viewport)
-- **File format:** MP4 (H.264 codec)
+- **Aspect ratio:** 4:5 / 1:1 preferred for broad feed distribution; 9:16 is a mobile-only opt-in (crops to 1:1 on desktop). Aspect ratio is guidance, not an enforceable gate — captions are the spec to enforce
+  - Vertical 4:5: 1080x1350px (preferred — fills the mobile feed, uncropped on desktop)
+  - Square 1:1: 1080x1080px (preferred — safe on every surface)
+  - Vertical 9:16: 1080x1920px (opt-in, for the vertical video tab; delivered mobile-only and crops to 1:1 on desktop — the official 9:16 numeric target is scoped to ads, not organic)
+  - If using 16:9: 1920x1080px minimum (letterboxed in the feed)
+- **File format:** MP4 (H.264) — the safe default. LinkedIn's own sources conflict on MOV/AVI (member troubleshooting lists them supported; the Pages spec says no longer supported), so treat MOV/AVI as warn-only, not blocking — re-encode to MP4 when in doubt
 - **Maximum file size:** 5GB
 - **Maximum length:** 10 minutes (but aim for 30-60 seconds. 30% completion rate minimum or zero distribution)
 - **Frame rate:** 30fps standard, 60fps for smooth motion
@@ -645,7 +645,7 @@ Before posting any video, verify:
 - [ ] Ends with engagement-focused CTA
 
 **Technical:**
-- [ ] Vertical 9:16 format (1080x1920) for maximum reach in immersive feed
+- [ ] Aspect ratio 4:5 (1080x1350) or 1:1 for broad feed distribution — 9:16 only if targeting the opt-in vertical video tab
 - [ ] Professional captions added
 - [ ] Audio quality clear and consistent
 - [ ] Thumbnail captures attention
@@ -659,7 +659,7 @@ Before posting any video, verify:
 - [ ] Complements overall content strategy
 - [ ] Doesn't include external links
 
-**Bottom Line on Video:** Use strategically when it genuinely adds value beyond text. Prioritize authenticity over production quality. Focus on 60-second videos that deliver concentrated insights. LinkedIn now requires 30% minimum completion rate for any distribution — shorter is safer. Always optimize for mobile-first consumption with vertical 9:16 format, captions, and 3-second hooks.
+**Bottom Line on Video:** Use strategically when it genuinely adds value beyond text. Prioritize authenticity over production quality. Focus on 60-second videos that deliver concentrated insights. LinkedIn now requires 30% minimum completion rate for any distribution — shorter is safer. Always optimize for mobile-first consumption: captions on (the one enforceable spec), 4:5/1:1 aspect for broad distribution, and a front-loaded opening for muted autoplay.
 
 
 ## Creator Mode Features (Available to All Users)