diff --git a/CHANGELOG.md b/CHANGELOG.md
index b951975e45..39f440a3cc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -34,6 +34,7 @@ Docs: https://docs.openclaw.ai
 - Onboarding: QuickStart now auto-installs shell completion (prompt only in Manual).
 - Docker: make `docker-setup.sh` compatible with macOS Bash 3.2 and empty extra mounts. (#9441) Thanks @mateusz-michalik.
 - Auth: strip embedded line breaks from pasted API keys and tokens before storing/resolving credentials.
+- Agents: strip reasoning tags and downgraded tool markers from messaging tool and streaming output to prevent leakage. (#11053, #13453) Thanks @liebertar, @meaadore1221-afk, @gumadeiras.
 - Web UI: make chat refresh smoothly scroll to the latest messages and suppress new-messages badge flash during manual refresh.
 - Tools/web_search: include provider-specific settings in the web search cache key, and pass `inlineCitations` for Grok. (#12419) Thanks @tmchow.
 - Tools/web_search: fix Grok response parsing for xAI Responses API output blocks. (#13049) Thanks @ereid7.