diff --git a/src/agent/agent_loop.rs b/src/agent/agent_loop.rs
index 21cd5a4..19f39a3 100644
--- a/src/agent/agent_loop.rs
+++ b/src/agent/agent_loop.rs
@@ -885,8 +885,13 @@ impl AgentLoop {
         let mut emitted_messages = Vec::new();
 
         for iteration in 0..self.max_iterations {
-            #[cfg(debug_assertions)]
-            tracing::debug!(iteration, "Agent iteration started");
+            tracing::info!(
+                iteration = iteration,
+                message_count = messages.len(),
+                emitted_count = emitted_messages.len(),
+                max_iterations = self.max_iterations,
+                "AgentLoop: iteration start"
+            );
 
             // 检查取消信号
             if let Some(ref token) = self.cancel_token {
@@ -953,6 +958,8 @@ impl AgentLoop {
                     .map(|message| chat_message_to_llm_message(message, &mut image_budget)),
             );
 
+            let request_msg_count = messages_for_llm.len();
+            let has_tools = tools.is_some();
             let request = ChatCompletionRequest {
                 messages: messages_for_llm,
                 temperature: None,
@@ -960,12 +967,31 @@ impl AgentLoop {
                 tools,
             };
 
+            tracing::info!(
+                iteration = iteration,
+                request_messages = request_msg_count,
+                has_tools = has_tools,
+                "AgentLoop: calling LLM"
+            );
+            let llm_start = std::time::Instant::now();
             let response = match (*self.provider).chat(request).await {
-                Ok(response) => response,
+                Ok(response) => {
+                    let llm_ms = llm_start.elapsed().as_millis();
+                    tracing::info!(
+                        iteration = iteration,
+                        llm_ms = llm_ms,
+                        response_len = response.content.len(),
+                        tool_calls_count = response.tool_calls.len(),
+                        "AgentLoop: LLM response received"
+                    );
+                    response
+                }
                 Err(e) => {
+                    let llm_ms = llm_start.elapsed().as_millis();
                     tracing::error!(
                         provider = %self.provider.name(),
                         model = %self.provider.model_id(),
+                        llm_ms = llm_ms,
                         error = %e,
                         error_details = %format_error_chain(e.as_ref()),
                         "LLM request failed"
@@ -1037,7 +1063,15 @@ impl AgentLoop {
             .await;
 
             // Execute tools and add results to messages
+            let tools_start = std::time::Instant::now();
             let tool_results = self.execute_tools(&response.tool_calls).await;
+            let tools_ms = tools_start.elapsed().as_millis();
+            tracing::info!(
+                iteration = iteration,
+                tool_count = response.tool_calls.len(),
+                tools_ms = tools_ms,
+                "AgentLoop: tools executed, emitting results"
+            );
 
             for (tool_call, result) in response.tool_calls.iter().zip(tool_results.iter()) {
                 // Truncate tool result if too large
@@ -1116,15 +1150,21 @@ impl AgentLoop {
             }
 
             // Loop continues to next iteration with updated messages
-            #[cfg(debug_assertions)]
-            tracing::debug!(
-                iteration,
+            tracing::info!(
+                iteration = iteration,
                 message_count = messages.len(),
-                "Tool execution complete, continuing to next iteration"
+                emitted_count = emitted_messages.len(),
+                "AgentLoop: tool results emitted, continuing to next iteration"
             );
         }
 
         // Max iterations reached - ask LLM for a summary based on completed work
+        tracing::warn!(
+            max_iterations = self.max_iterations,
+            message_count = messages.len(),
+            emitted_count = emitted_messages.len(),
+            "AgentLoop: MAX ITERATIONS REACHED, forcing summary"
+        );
         tracing::warn!("Max iterations reached, requesting final summary from LLM");
 
         // Add a message asking for summary
@@ -1211,15 +1251,56 @@ impl AgentLoop {
     }
 
     async fn emit_live_tool_call_message(&self, message: ChatMessage) {
+        let start = std::time::Instant::now();
+        let content_len = message.content.len();
+        let has_tool_calls = message.tool_calls.is_some();
+        tracing::info!(
+            content_len = content_len,
+            has_tool_calls = has_tool_calls,
+            role = %message.role,
+            "AgentLoop: emit_live_tool_call_message START"
+        );
         if let Some(handler) = &self.emitted_message_handler {
             handler.handle(message).await;
         }
+        let elapsed_ms = start.elapsed().as_millis();
+        if elapsed_ms > 100 {
+            tracing::warn!(
+                elapsed_ms = elapsed_ms,
+                "AgentLoop: emit_live_tool_call_message SLOW (>100ms)"
+            );
+        } else {
+            tracing::info!(
+                elapsed_ms = elapsed_ms,
+                "AgentLoop: emit_live_tool_call_message DONE"
+            );
+        }
     }
 
     async fn emit_tool_result(&self, message: ChatMessage, duration_ms: Option<u64>) {
+        let start = std::time::Instant::now();
+        let content_len = message.content.len();
+        tracing::info!(
+            tool_name = %message.tool_name.as_deref().unwrap_or("unknown"),
+            content_len = content_len,
+            tool_duration_ms = duration_ms,
+            "AgentLoop: emit_tool_result START"
+        );
         if let Some(handler) = &self.emitted_message_handler {
             handler.handle_tool_result(message, duration_ms).await;
         }
+        let elapsed_ms = start.elapsed().as_millis();
+        if elapsed_ms > 100 {
+            tracing::warn!(
+                elapsed_ms = elapsed_ms,
+                "AgentLoop: emit_tool_result SLOW (>100ms)"
+            );
+        } else {
+            tracing::info!(
+                elapsed_ms = elapsed_ms,
+                "AgentLoop: emit_tool_result DONE"
+            );
+        }
     }
 
     /// Determine whether to execute tools in parallel or sequentially.
diff --git a/src/bus/mod.rs b/src/bus/mod.rs
index de0d507..022cbb8 100644
--- a/src/bus/mod.rs
+++ b/src/bus/mod.rs
@@ -54,12 +54,60 @@ impl MessageBus {
 
     /// Publish a message to the outbound queue
     pub async fn publish_outbound(&self, msg: OutboundMessage) -> Result<(), BusError> {
+        let event_kind = format!("{:?}", msg.event_kind);
+        let channel_name = msg.channel.clone();
+        let chat_id = msg.chat_id.clone();
+        let content_len = msg.content.len();
         #[cfg(debug_assertions)]
-        tracing::debug!(channel = %msg.channel, chat_id = %msg.chat_id, content_len = %msg.content.len(), "Bus: publishing outbound message");
-        self.outbound_tx
-            .send(msg)
-            .await
-            .map_err(|_| BusError::Closed)
+        tracing::debug!(channel = %channel_name, chat_id = %chat_id, content_len = content_len, "Bus: publishing outbound message");
+
+        // Try non-blocking send first for diagnostics
+        match self.outbound_tx.try_send(msg) {
+            Ok(()) => {
+                tracing::debug!(
+                    event_kind = %event_kind,
+                    channel = %channel_name,
+                    chat_id = %chat_id,
+                    "Bus: outbound sent immediately"
+                );
+                return Ok(());
+            }
+            Err(tokio::sync::mpsc::error::TrySendError::Full(msg)) => {
+                let msg_content_len = msg.content.len();
+                tracing::warn!(
+                    event_kind = %event_kind,
+                    channel = %channel_name,
+                    chat_id = %chat_id,
+                    content_len = msg_content_len,
+                    "Bus: outbound channel FULL, blocking until capacity available..."
+                );
+                let start = std::time::Instant::now();
+                let result = self.outbound_tx.send(msg).await;
+                let wait_ms = start.elapsed().as_millis();
+                match &result {
+                    Ok(()) => {
+                        tracing::info!(
+                            event_kind = %event_kind,
+                            channel = %channel_name,
+                            chat_id = %chat_id,
+                            wait_ms = wait_ms,
+                            "Bus: outbound sent after blocking (channel was full)"
+                        );
+                    }
+                    Err(_) => {
+                        tracing::error!(
+                            event_kind = %event_kind,
+                            wait_ms = wait_ms,
+                            "Bus: outbound channel closed while blocked"
+                        );
+                    }
+                }
+                return result.map_err(|_| BusError::Closed);
+            }
+            Err(tokio::sync::mpsc::error::TrySendError::Closed(_)) => {
+                return Err(BusError::Closed);
+            }
+        }
     }
 
     /// Consume an outbound message from the outbound queue.
diff --git a/src/gateway/outbound_dispatcher.rs b/src/gateway/outbound_dispatcher.rs
index 3f6c604..ad5cbf4 100644
--- a/src/gateway/outbound_dispatcher.rs
+++ b/src/gateway/outbound_dispatcher.rs
@@ -33,21 +33,33 @@ impl OutboundDispatcher {
     pub async fn run(&self) {
         tracing::info!("OutboundDispatcher started");
 
+        let mut total_processed: u64 = 0;
         loop {
+            let consume_start = std::time::Instant::now();
             let msg = match self.bus.consume_outbound().await {
                 Some(msg) => msg,
                 None => {
-                    tracing::info!("Outbound bus closed, stopping dispatcher");
+                    tracing::info!(total_processed = total_processed, "Outbound bus closed, stopping dispatcher");
                     break;
                 }
             };
-            #[cfg(debug_assertions)]
-            tracing::debug!(
-                channel = %msg.channel,
-                chat_id = %msg.chat_id,
-                content_len = msg.content.len(),
-                "OutboundDispatcher received message"
-            );
+            let consume_wait_ms = consume_start.elapsed().as_millis();
+            let event_kind = format!("{:?}", msg.event_kind);
+            let channel_name = msg.channel.clone();
+            let chat_id = msg.chat_id.clone();
+            let _content_len = msg.content.len();
+            total_processed += 1;
+
+            if consume_wait_ms > 100 {
+                tracing::warn!(
+                    event_kind = %event_kind,
+                    channel = %channel_name,
+                    chat_id = %chat_id,
+                    total_processed = total_processed,
+                    consume_wait_ms = consume_wait_ms,
+                    "OutboundDispatcher: waited long for next message (bus may be draining slowly)"
+                );
+            }
 
             // Skip messages with virtual scheduler chat IDs (e.g., "scheduler/job_id")
             // These are internal messages from SilentAgentTask that should not be sent externally
@@ -65,8 +77,37 @@ impl OutboundDispatcher {
 
             match channel {
                 Some(ch) => {
-                    if let Err(error) = self.send_with_retry(&*ch, msg).await {
-                        tracing::error!(channel = %channel_name, error = %error, "Failed to send message after retries");
+                    let send_start = std::time::Instant::now();
+                    let event_kind = format!("{:?}", msg.event_kind);
+                    match self.send_with_retry(&*ch, msg).await {
+                        Ok(()) => {
+                            let send_ms = send_start.elapsed().as_millis();
+                            if send_ms > 500 {
+                                tracing::warn!(
+                                    channel = %channel_name,
+                                    event_kind = %event_kind,
+                                    send_ms = send_ms,
+                                    "OutboundDispatcher: slow channel send"
+                                );
+                            } else {
+                                tracing::info!(
+                                    channel = %channel_name,
+                                    event_kind = %event_kind,
+                                    send_ms = send_ms,
+                                    "OutboundDispatcher: message sent to channel"
+                                );
+                            }
+                        }
+                        Err(error) => {
+                            let send_ms = send_start.elapsed().as_millis();
+                            tracing::error!(
+                                channel = %channel_name,
+                                event_kind = %event_kind,
+                                send_ms = send_ms,
+                                error = %error,
+                                "OutboundDispatcher: failed to send after retries"
+                            );
+                        }
                     }
                 }
                 None => {
diff --git a/src/gateway/session.rs b/src/gateway/session.rs
index b21d5ae..7cb4066 100644
--- a/src/gateway/session.rs
+++ b/src/gateway/session.rs
@@ -76,16 +76,44 @@ impl BusToolCallEmitter {
 #[async_trait]
 impl EmittedMessageHandler for BusToolCallEmitter {
     async fn handle(&self, message: ChatMessage) {
-        for outbound in OutboundMessage::from_chat_message(
+        let outbounds = OutboundMessage::from_chat_message(
             &self.channel_name,
             &self.chat_id,
             None, // session_id
             None,
             &self.metadata,
             &message,
-        ) {
+        );
+        let count = outbounds.len();
+        tracing::info!(
+            channel = %self.channel_name,
+            chat_id = %self.chat_id,
+            msg_count = count,
+            msg_role = %message.role,
+            has_tool_calls = message.tool_calls.is_some(),
+            "BusToolCallEmitter::handle publishing messages"
+        );
+        for (i, outbound) in outbounds.into_iter().enumerate() {
+            let event_kind = format!("{:?}", outbound.event_kind);
+            let content_len = outbound.content.len();
             if let Err(error) = self.bus.publish_outbound(outbound).await {
-                tracing::error!(error = %error, channel = %self.channel_name, chat_id = %self.chat_id, "Failed to publish live outbound tool call");
+                tracing::error!(
+                    error = %error,
+                    channel = %self.channel_name,
+                    chat_id = %self.chat_id,
+                    event_kind = %event_kind,
+                    "Failed to publish live outbound tool call"
+                );
+            } else {
+                tracing::info!(
+                    channel = %self.channel_name,
+                    chat_id = %self.chat_id,
+                    event_kind = %event_kind,
+                    idx = i,
+                    total = count,
+                    content_len = content_len,
+                    "BusToolCallEmitter: published message to bus"
+                );
             }
         }
     }
@@ -95,16 +123,44 @@ impl EmittedMessageHandler for BusToolCallEmitter {
         if let Some(ms) = duration_ms {
             metadata.insert("tool_duration_ms".to_string(), ms.to_string());
         }
-        for outbound in OutboundMessage::from_chat_message(
+        let outbounds = OutboundMessage::from_chat_message(
             &self.channel_name,
             &self.chat_id,
             None, // session_id
             None,
             &metadata,
             &message,
-        ) {
+        );
+        let count = outbounds.len();
+        tracing::info!(
+            channel = %self.channel_name,
+            chat_id = %self.chat_id,
+            msg_count = count,
+            tool_name = %message.tool_name.as_deref().unwrap_or("unknown"),
+            tool_state = ?message.tool_state,
+            content_len = message.content.len(),
+            duration_ms = duration_ms,
+            "BusToolCallEmitter::handle_tool_result publishing messages"
+        );
+        for (i, outbound) in outbounds.into_iter().enumerate() {
+            let event_kind = format!("{:?}", outbound.event_kind);
             if let Err(error) = self.bus.publish_outbound(outbound).await {
-                tracing::error!(error = %error, channel = %self.channel_name, chat_id = %self.chat_id, "Failed to publish live outbound tool call");
+                tracing::error!(
+                    error = %error,
+                    channel = %self.channel_name,
+                    chat_id = %self.chat_id,
+                    event_kind = %event_kind,
+                    "Failed to publish live outbound tool result"
+                );
+            } else {
+                tracing::info!(
+                    channel = %self.channel_name,
+                    chat_id = %self.chat_id,
+                    event_kind = %event_kind,
+                    idx = i,
+                    total = count,
+                    "BusToolCallEmitter: published tool result to bus"
+                );
             }
         }
     }