diff --git a/.custodian-brief.md b/.custodian-brief.md
index bc9e059..cc12c85 100644
--- a/.custodian-brief.md
+++ b/.custodian-brief.md
@@ -2,11 +2,22 @@
 # Custodian Brief — markitect-tool
 
 **Domain:** markitect  
-**Last synced:** 2026-05-04 17:23 UTC  
+**Last synced:** 2026-05-04 17:43 UTC  
 **State Hub:** http://127.0.0.1:8000 *(adjust if running on a remote machine)*
 
 ## Active Workstreams
 
+### Render And Document Function Extensions
+Progress: 0/6 done  |  workstream_id: `a38f676a-0d0b-493c-9792-2e34480c3681`
+
+**Open tasks:**
+- · P15.1 - Typed document values and value mapping  `995945c5`
+- · P15.2 - Richer function syntax without losing Markdown compatibility  `bfce1388`
+- · P15.3 - Document-local reusable functions  `a8a8f017`
+- · P15.4 - Quarkdown and render/export adapters  `69e550a0`
+- · P15.5 - Render-aware references, numbering, and assets  `53eb9f94`
+- · P15.6 - Permission sandbox for non-core functions  `9ef2c516`
+
 ### Agent Working Memory Context Cache
 Progress: 0/6 done  |  workstream_id: `6269f338-4f5c-40ee-90e5-0371f5c3874c`