diff --git a/changelog.md b/changelog.md
index 463b089..d207dc2 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 2026-01-20 - 1.5.3 - fix(driveragent)
+prefix thinking tokens with [THINKING] when forwarding streaming chunks to onToken
+
+- Wraps chunk.thinking with '[THINKING] ' before calling onToken to mark thinking tokens
+- Forwards chunk.content unchanged
+- Change applied in ts/smartagent.classes.driveragent.ts for both initial and subsequent assistant streaming responses
+- No API signature changes; only the token payloads sent to onToken are altered
+
 ## 2026-01-20 - 1.5.2 - fix()
 no changes in this diff; nothing to release
 
diff --git a/ts/00_commitinfo_data.ts b/ts/00_commitinfo_data.ts
index 76d8ea1..dbe9ebb 100644
--- a/ts/00_commitinfo_data.ts
+++ b/ts/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartagent',
-  version: '1.5.2',
+  version: '1.5.3',
   description: 'an agentic framework built on top of @push.rocks/smartai'
 }
diff --git a/ts/smartagent.classes.driveragent.ts b/ts/smartagent.classes.driveragent.ts
index eb554a9..85bbb27 100644
--- a/ts/smartagent.classes.driveragent.ts
+++ b/ts/smartagent.classes.driveragent.ts
@@ -491,10 +491,14 @@ Your complete output here
         images: images,
         tools: tools.length > 0 ? tools : undefined,
       },
-      // Pass onToken callback through onChunk for streaming
+      // Pass onToken callback through onChunk for streaming with thinking markers
       this.onToken ? (chunk: any) => {
-        if (chunk.thinking && this.onToken) this.onToken(chunk.thinking);
-        if (chunk.content && this.onToken) this.onToken(chunk.content);
+        if (chunk.thinking && this.onToken) {
+          this.onToken(`[THINKING] ${chunk.thinking}`);
+        }
+        if (chunk.content && this.onToken) {
+          this.onToken(chunk.content);
+        }
       } : undefined
     );
 
@@ -574,10 +578,14 @@ Your complete output here
         messageHistory: historyForChat,
         tools: tools.length > 0 ? tools : undefined,
       },
-      // Pass onToken callback through onChunk for streaming
+      // Pass onToken callback through onChunk for streaming with thinking markers
       this.onToken ? (chunk: any) => {
-        if (chunk.thinking && this.onToken) this.onToken(chunk.thinking);
-        if (chunk.content && this.onToken) this.onToken(chunk.content);
+        if (chunk.thinking && this.onToken) {
+          this.onToken(`[THINKING] ${chunk.thinking}`);
+        }
+        if (chunk.content && this.onToken) {
+          this.onToken(chunk.content);
+        }
       } : undefined
     );