diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4edeaa0ab4..29ad7ef601 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- Auto-reply/Runner: emit `onAgentRunStart` only after agent lifecycle or tool activity begins (and only once per run), so fallback preflight errors no longer mark runs as started. (#21165) Thanks @shakkernerd.
+
 ## 2026.2.19
 
 ### Changes