Ignore empty reasoning heartbeats

app/src/ai/runtime/provider_run_coordinator.rs

@@ -732,6 +732,13 @@ impl ProviderRunCoordinator {
                         return Ok(());
                     }
                 }
+                AgentEvent::ReasoningCompleted { text, signature }
+                    if text.is_empty() && signature.is_none() =>
+                {
+                    // Ignore provider heartbeat-shaped empty reasoning events. They are not
+                    // meaningful model progress and must not keep an otherwise idle turn alive.
+                    continue;
+                }
                 AgentEvent::ReasoningCompleted { text, signature } => {
                     if !self
                         .ensure_model_started_acknowledged(

crates/galaxy_agent_rig/src/openai_compatible_tests.rs

@@ -86,6 +86,45 @@ async fn rig_stream_maps_reasoning_text_usage_and_stop() {
     );
 }
 
+#[tokio::test]
+async fn rig_stream_ignores_empty_reasoning_heartbeats() {
+    let http_client = MockStreamingClient {
+        sse_bytes: sse(&[
+            r#"{"id":"cmpl-1","model":"test-model","choices":[{"delta":{"reasoning_content":"","tool_calls":[]},"finish_reason":null}],"usage":null}"#,
+            r#"{"id":"cmpl-1","model":"test-model","choices":[{"delta":{"content":"done","tool_calls":[]},"finish_reason":"stop"}],"usage":null}"#,
+            "[DONE]",
+        ]),
+    };
+    let client = openai::CompletionsClient::builder()
+        .api_key("test-key")
+        .base_url("http://localhost/v1")
+        .http_client(http_client)
+        .build()
+        .unwrap();
+    let model = client.completion_model("test-model");
+    let (_, control) = galaxy_agent_core::turn_control();
+
+    let events = start_model_turn(model, text_request(), control, None, true)
+        .await
+        .unwrap()
+        .collect::<Vec<_>>()
+        .await
+        .into_iter()
+        .collect::<Result<Vec<_>, _>>()
+        .unwrap();
+
+    assert!(!events.iter().any(|event| matches!(
+        event,
+        AgentEvent::ReasoningCompleted { text, signature }
+            if text.is_empty() && signature.is_none()
+    )));
+    assert!(
+        events
+            .iter()
+            .any(|event| matches!(event, AgentEvent::TextDelta { text } if text == "done"))
+    );
+}
+
 #[tokio::test]
 async fn cancellation_before_stream_start_is_a_normal_stop() {
     let runtime = OpenAICompatibleRuntime::new(OpenAICompatibleRuntimeConfig {

crates/galaxy_agent_rig/src/stream.rs

@@ -99,10 +99,13 @@ where
                         }
                         Ok(StreamedAssistantContent::Reasoning(reasoning)) => {
                             let text = reasoning.display_text();
-                            yield Ok(AgentEvent::ReasoningCompleted {
-                                text,
-                                signature: reasoning.first_signature().map(str::to_string),
-                            });
+                            let signature = reasoning.first_signature().map(str::to_string);
+                            // Some Responses providers send empty reasoning blocks as heartbeats.
+                            // Do not expose them as model progress: doing so continually resets the
+                            // coordinator's idle timeout and can leave a turn stuck forever.
+                            if !text.is_empty() || signature.is_some() {
+                                yield Ok(AgentEvent::ReasoningCompleted { text, signature });
+                            }
                         }
                         Ok(StreamedAssistantContent::ReasoningDelta { reasoning, .. }) => {
                             if !reasoning.is_empty() {
@@ -236,10 +239,11 @@ where
                     }
                 }
                 rig_core::completion::AssistantContent::Reasoning(reasoning) => {
-                    yield Ok(AgentEvent::ReasoningCompleted {
-                        text: reasoning.display_text(),
-                        signature: reasoning.first_signature().map(str::to_string),
-                    });
+                    let text = reasoning.display_text();
+                    let signature = reasoning.first_signature().map(str::to_string);
+                    if !text.is_empty() || signature.is_some() {
+                        yield Ok(AgentEvent::ReasoningCompleted { text, signature });
+                    }
                 }
                 rig_core::completion::AssistantContent::ToolCall(tool_call) => {
                     yield Ok(AgentEvent::Tool {