diff --git a/.changeset/durable-agent-tool-stop-detection.md b/.changeset/durable-agent-tool-stop-detection.md
new file mode 100644
index 0000000000..4a5938084f
--- /dev/null
+++ b/.changeset/durable-agent-tool-stop-detection.md
@@ -0,0 +1,5 @@
+---
+'@workflow/ai': patch
+---
+
+Continue DurableAgent tool loops whenever a model step contains tool calls, regardless of the reported finish reason.
diff --git a/packages/ai/src/agent/stream-text-iterator.ts b/packages/ai/src/agent/stream-text-iterator.ts
index 07b7e87bd5..112672249d 100644
--- a/packages/ai/src/agent/stream-text-iterator.ts
+++ b/packages/ai/src/agent/stream-text-iterator.ts
@@ -327,7 +327,7 @@ export async function* streamTextIterator({
         // Normalize finishReason - AI SDK v6 returns { unified, raw }, v5 returns a string
         const finishReason = normalizeFinishReason(finish?.finishReason);
 
-        if (finishReason === 'tool-calls') {
+        if (finishReason === 'tool-calls' || toolCalls.length > 0) {
           lastStepWasToolCalls = true;
 
           // Build reasoning content parts from the step result.