diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0c4c2f37618b..90f14130b2f5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,7 @@ Docs: https://docs.openclaw.ai
 
 - Gateway: avoid sending duplicate tool-event frames to Control UI connections that are subscribed by both run and session.
 - Discord/OpenAI voice: accept longer leading wake-name mistranscripts such as "Open Club" for OpenClaw.
+- Agents/OpenAI-compatible: stop ModelStudio-compatible chat requests before sending system/tool-only payloads that have no usable user or assistant turn. (#86177) Thanks @TurboTheTurtle.
 - Discord/OpenAI voice: accept leading fuzzy wake-name transcripts such as "Monty" or "Moti" for a Molty agent while keeping ambient speech gated.
 - Media understanding: convert HEIC and HEIF images to JPEG before image description providers run so iPhone photos work in direct and configured image-description flows. (#86037)
 - Agents: release embedded-attempt session locks from outer teardown so post-prompt exceptions cannot wedge later requests behind `SessionWriteLockTimeoutError`. Fixes #86014. Thanks @openperf.