diff --git a/crates/tui/src/cost_status.rs b/crates/tui/src/cost_status.rs
index 60feebd3..38476641 100644
--- a/crates/tui/src/cost_status.rs
+++ b/crates/tui/src/cost_status.rs
@@ -42,19 +42,20 @@ pub fn report(model: &str, usage: &Usage) {
     if !cost.is_positive() {
         return;
     }
-    if let Ok(mut pending) = cell().lock() {
-        pending.usd += cost.usd;
-        pending.cny += cost.cny;
-    }
+    // Recover from poisoned lock — a previous holder panicked but the
+    // accumulated data is still valid.
+    let mut pending = cell().lock().unwrap_or_else(|e| e.into_inner());
+    pending.usd += cost.usd;
+    pending.cny += cost.cny;
 }
 
 /// Drain the pending cost. Returns the accumulated amount and resets
 /// the pool to zero. Called by the TUI render / event loop on each
 /// frame; any non-zero result gets folded into `accrue_subagent_cost_estimate`.
 pub fn drain() -> CostEstimate {
-    let Ok(mut pending) = cell().lock() else {
-        return CostEstimate::default();
-    };
+    // Recover from poisoned lock — a previous holder panicked but the
+    // accumulated data is still valid.
+    let mut pending = cell().lock().unwrap_or_else(|e| e.into_inner());
     std::mem::take(&mut *pending)
 }
 
@@ -63,9 +64,8 @@ pub fn drain() -> CostEstimate {
 /// state. Production code should always use [`drain`].
 #[cfg(test)]
 pub fn reset_for_tests() {
-    if let Ok(mut pending) = cell().lock() {
-        *pending = CostEstimate::default();
-    }
+    let mut pending = cell().lock().unwrap_or_else(|e| e.into_inner());
+    *pending = CostEstimate::default();
 }
 
 #[cfg(test)]
diff --git a/crates/tui/src/hooks.rs b/crates/tui/src/hooks.rs
index 58fe4f1d..f6d2ddee 100644
--- a/crates/tui/src/hooks.rs
+++ b/crates/tui/src/hooks.rs
@@ -1077,7 +1077,7 @@ impl HookExecutor {
         let env = env_vars.clone();
         let wd = working_dir.clone();
 
-        // Spawn in a detached thread
+        // Spawn in a detached thread (fire-and-forget hook execution).
         std::thread::spawn(move || {
             let mut command = HookExecutor::build_shell_command(&cmd);
             command
diff --git a/crates/tui/src/mcp.rs b/crates/tui/src/mcp.rs
index ab274d54..1341be85 100644
--- a/crates/tui/src/mcp.rs
+++ b/crates/tui/src/mcp.rs
@@ -588,6 +588,8 @@ pub struct SseTransport {
     endpoint_url: Option<String>,
     receiver: tokio::sync::mpsc::UnboundedReceiver<SseInbound>,
     pending_messages: VecDeque<Vec<u8>>,
+    #[allow(dead_code)]
+    sse_task: tokio::task::JoinHandle<()>,
 }
 
 enum SseInbound {
@@ -647,7 +649,7 @@ impl SseTransport {
         let headers_clone = headers.clone();
         let wait_cancel_token = cancel_token.clone();
 
-        tokio::spawn(async move {
+        let sse_task = tokio::spawn(async move {
             if cancel_token.is_cancelled() {
                 return;
             }
@@ -686,6 +688,7 @@ impl SseTransport {
             endpoint_url: None,
             receiver: rx,
             pending_messages: VecDeque::new(),
+            sse_task,
         };
         transport
             .wait_for_endpoint(&wait_cancel_token, endpoint_timeout)
@@ -5491,6 +5494,7 @@ mod tests {
         });
 
         let (_sender, receiver) = mpsc::unbounded_channel();
+        let sse_task = tokio::spawn(async {});
         let mut transport = SseTransport {
             client: test_http_client(),
             base_url: format!("http://{addr}/sse"),
@@ -5498,6 +5502,7 @@ mod tests {
             endpoint_url: Some(format!("http://{addr}/messages")),
             receiver,
             pending_messages: VecDeque::new(),
+            sse_task,
         };
 
         let err = transport
diff --git a/crates/tui/src/mcp_server.rs b/crates/tui/src/mcp_server.rs
index cb5b4b6b..e9da6ae3 100644
--- a/crates/tui/src/mcp_server.rs
+++ b/crates/tui/src/mcp_server.rs
@@ -381,7 +381,7 @@ impl McpServer {
         let messages = if internal_name == "deepseek" {
             vec![user_message]
         } else {
-            let thread = self.threads.lock().unwrap();
+            let thread = self.threads.lock().unwrap_or_else(|e| e.into_inner());
             let mut existing = thread.get(&thread_id).cloned().ok_or_else(|| RpcError {
                 code: -32602,
                 message: format!("Thread not found: {thread_id}"),
@@ -431,7 +431,7 @@ impl McpServer {
 
         // Store the assistant response in the thread
         {
-            let mut thread = self.threads.lock().unwrap();
+            let mut thread = self.threads.lock().unwrap_or_else(|e| e.into_inner());
             let convo = thread.entry(thread_id.clone()).or_default();
             // If deepseek, we already have just the user message; if deepseek-reply,
             // the user message was appended to the cloned messages above but we need
diff --git a/crates/tui/src/runtime_log.rs b/crates/tui/src/runtime_log.rs
index eda81050..f82e79a7 100644
--- a/crates/tui/src/runtime_log.rs
+++ b/crates/tui/src/runtime_log.rs
@@ -154,12 +154,26 @@ pub fn init() -> Result<TuiLogGuard> {
         .or_else(|_| EnvFilter::try_new("info"))
         .unwrap_or_else(|_| EnvFilter::new("info"));
 
+    let log_path_clone = log_path.clone();
     let subscriber = tracing_subscriber::registry().with(env_filter).with(
         fmt::layer()
-            .with_writer(move || {
-                subscriber_file
-                    .try_clone()
-                    .expect("clone log file handle for tracing writer")
+            .with_writer(move || -> Box<dyn std::io::Write + Send> {
+                // Clone the file handle for each write. If clone fails (fd exhaustion),
+                // fall back to reopening the same path, or ultimately stderr.
+                match subscriber_file.try_clone() {
+                    Ok(f) => Box::new(f),
+                    Err(e) => {
+                        tracing::warn!("Failed to clone log file handle: {e}, reopening");
+                        match std::fs::OpenOptions::new()
+                            .create(true)
+                            .append(true)
+                            .open(&log_path_clone)
+                        {
+                            Ok(f) => Box::new(f),
+                            Err(_) => Box::new(std::io::stderr()),
+                        }
+                    }
+                }
             })
             .with_ansi(false)
             .with_target(true)