diff --git a/packages/core/src/core/coreToolScheduler.test.ts b/packages/core/src/core/coreToolScheduler.test.ts
index f9badb5b2bd..17fb402d7e3 100644
--- a/packages/core/src/core/coreToolScheduler.test.ts
+++ b/packages/core/src/core/coreToolScheduler.test.ts
@@ -13397,6 +13397,9 @@ describe('CoreToolScheduler telemetry spans', () => {
     expect(responseText).not.toContain(
       'User intentionally cancelled this tool call. Stop',
     );
+    expect(responseText).toContain(
+      'Stop and await further instructions; do not retry or work around it.',
+    );
   });
 
   // A post-execution cancellation drops the model-visible output, but the
diff --git a/packages/core/src/core/coreToolScheduler.ts b/packages/core/src/core/coreToolScheduler.ts
index 5449cb622dd..f4380c956c6 100644
--- a/packages/core/src/core/coreToolScheduler.ts
+++ b/packages/core/src/core/coreToolScheduler.ts
@@ -396,7 +396,7 @@ const TOOL_SPAN_STATUS_TOOL_TIMEOUT = 'Tool execution timed out';
 const TOOL_CANCELLED_BEFORE_COMPLETION_MESSAGE =
   'User intentionally cancelled this tool call. Stop and await further instructions; do not retry or work around it.';
 const TOOL_CANCELLED_AFTER_COMPLETION_MESSAGE =
-  'The tool had already completed; its output was discarded. User intentionally cancelled. Stop and await further instructions; do not retry.';
+  'The tool had already completed; its output was discarded. User intentionally cancelled. Stop and await further instructions; do not retry or work around it.';
 
 /**
  * Builds the failure ToolResult surfaced when a tool call exceeds the