diff --git a/gptscript/frame.py b/gptscript/frame.py
index c136611..9ba15da 100644
--- a/gptscript/frame.py
+++ b/gptscript/frame.py
@@ -115,6 +115,7 @@ def __init__(self,
                  id: str = "",
                  tool: Tool = None,
                  agentGroup: list[ToolReference] = None,
+                 currentAgent: ToolReference = None,
                  displayText: str = "",
                  inputContext: list[InputContext] = None,
                  toolCategory: str = "",
@@ -137,6 +138,9 @@ def __init__(self,
             for i in range(len(self.agentGroup)):
                 if isinstance(self.agentGroup[i], dict):
                     self.agentGroup[i] = ToolReference(**self.agentGroup[i])
+        self.currentAgent = currentAgent
+        if self.currentAgent is not None and isinstance(self.currentAgent, dict):
+            self.currentAgent = ToolReference(**self.currentAgent)
         self.displayText = displayText
         self.inputContext = inputContext
         if self.inputContext is not None:
diff --git a/gptscript/gptscript.py b/gptscript/gptscript.py
index 614aed0..8d5bfcc 100644
--- a/gptscript/gptscript.py
+++ b/gptscript/gptscript.py
@@ -70,7 +70,7 @@ def _wait_for_gptscript(self):
 
     def close(self):
         GPTScript.__gptscript_count -= 1
-        if GPTScript.__gptscript_count == 0:
+        if GPTScript.__gptscript_count == 0 and GPTScript.__process is not None:
             GPTScript.__process.stdin.close()
             GPTScript.__process.wait()
             GPTScript.__server_ready = False
@@ -149,4 +149,4 @@ def _get_command():
     if platform.system() == "Windows":
         bin_path += ".exe"
 
-    return bin_path if os.path.exists(bin_path) else "gptscript"
\ No newline at end of file
+    return bin_path if os.path.exists(bin_path) else "gptscript"
diff --git a/gptscript/run.py b/gptscript/run.py
index 9dbf726..2897808 100644
--- a/gptscript/run.py
+++ b/gptscript/run.py
@@ -51,10 +51,12 @@ async def text(self) -> str:
         try:
             if self._task is not None:
                 await self._task
-        except Exception:
+        except Exception as e:
             self._state = RunState.Error
             if self._aborted:
                 self._err = "Run was aborted"
+            else:
+                self._err = str(e)
         finally:
             self._task = None
 
diff --git a/tox.ini b/tox.ini
index d7abfd3..e99afad 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,14 +2,17 @@
 envlist = py3
 
 [testenv]
-deps = httpx
-	   pytest-asyncio
+deps =
+	httpx
+	pytest
+	pytest-asyncio
 
-passenv = OPENAI_API_KEY
-		  GPTSCRIPT_BIN
-		  GPTSCRIPT_URL
-		  GPTSCRIPT_DISABLE_SERVER
-		  GPTSCRIPT_CONFIG_FILE
+passenv =
+	OPENAI_API_KEY
+	GPTSCRIPT_BIN
+	GPTSCRIPT_URL
+	GPTSCRIPT_DISABLE_SERVER
+	GPTSCRIPT_CONFIG_FILE
 commands =
 	install_gptscript
-	pytest -s tests/
+	pytest -s tests/ {posargs}