From c78269209d93a08d3eb2c124c95e0b1bcf65c2ee Mon Sep 17 00:00:00 2001
From: Nathan Colosimo <110621881+NathanColosimo@users.noreply.github.com>
Date: Tue, 30 Jun 2026 16:41:29 -0700
Subject: [PATCH] fix(ai): continue durable agent tool loops

---
 .changeset/durable-agent-tool-stop-detection.md | 5 +++++
 packages/ai/src/agent/stream-text-iterator.ts   | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/durable-agent-tool-stop-detection.md

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 d3e7aecbc3..67c96fad42 100644
--- a/packages/ai/src/agent/stream-text-iterator.ts
+++ b/packages/ai/src/agent/stream-text-iterator.ts
@@ -331,7 +331,7 @@ export async function* streamTextIterator({
         // Normalize finishReason - AI SDK v6 returns { unified, raw }, v5 returns a string
         const finishReason = normalizeFinishReason(raw.rawFinishReason);
 
-        if (finishReason === 'tool-calls') {
+        if (finishReason === 'tool-calls' || toolCalls.length > 0) {
           lastStepWasToolCalls = true;
 
           // Build reasoning content parts from the step result.