diff --git a/cookbook/apps/multi_agent.py b/cookbook/apps/multi_agent.py
new file mode 100644
index 000000000..c09f56972
--- /dev/null
+++ b/cookbook/apps/multi_agent.py
@@ -0,0 +1,27 @@
+from marvin import AIApplication
+
+
+def get_foo():
+    """A function that returns the value of foo."""
+    return 42
+
+
+worker = AIApplication(
+    name="worker",
+    description="A simple worker application.",
+    plan_enabled=False,
+    state_enabled=False,
+    tools=[get_foo],
+)
+
+router = AIApplication(
+    name="router",
+    description="routes user requests to the appropriate worker",
+    plan_enabled=False,
+    state_enabled=False,
+    tools=[worker],
+)
+
+message = router("what is the value of foo?")
+
+assert "42" in message.content, "The answer should be 42."
diff --git a/src/marvin/components/ai_application.py b/src/marvin/components/ai_application.py
index 4d15c775d..4cdbedebc 100644
--- a/src/marvin/components/ai_application.py
+++ b/src/marvin/components/ai_application.py
@@ -238,7 +238,7 @@ def validate_tools(cls, v):
         # convert AI Applications and functions to tools
         for tool in v:
             if isinstance(tool, (AIApplication, Tool)):
-                tools.append(tool.as_function())
+                tools.append(tool.as_function(description=tool.description))
             elif callable(tool):
                 tools.append(tool)
             else:
@@ -305,11 +305,15 @@ async def run(self, input_text: str = None, model: str = None) -> Message:
         self.logger.debug_kv("AI response", last_message.content, key_style="blue")
         return last_message
 
-    def as_tool(self, name: str = None) -> Tool:
-        return AIApplicationTool(app=self, name=name)
+    def as_tool(
+        self,
+        name: Optional[str] = None,
+        description: Optional[str] = None,
+    ) -> Tool:
+        return AIApplicationTool(app=self, name=name, description=description)
 
-    def as_function(self, name: str = None) -> Callable:
-        return self.as_tool(name=name).as_function()
+    def as_function(self, name: str = None, description: str = None) -> Callable:
+        return self.as_tool(name=name, description=description).as_function()
 
 
 class AIApplicationTool(Tool):
diff --git a/src/marvin/tools/base.py b/src/marvin/tools/base.py
index 6f5823beb..d3c455084 100644
--- a/src/marvin/tools/base.py
+++ b/src/marvin/tools/base.py
@@ -43,9 +43,12 @@ def argument_schema(self) -> dict:
         schema.pop("title", None)
         return schema
 
-    def as_function(self) -> Function:
-        description = jinja_env.from_string(inspect.cleandoc(self.description or ""))
-        description = description.render(**self.dict(), TOOL=self)
+    def as_function(self, description: Optional[str] = None) -> Function:
+        if not description:
+            description = jinja_env.from_string(
+                inspect.cleandoc(self.description or "")
+            )
+            description = description.render(**self.dict(), TOOL=self)
 
         def fn(*args, **kwargs):
             return self.run(*args, **kwargs)
diff --git a/tests/test_components/test_ai_app.py b/tests/test_components/test_ai_app.py
index 6eeefcbe3..e5ae37dab 100644
--- a/tests/test_components/test_ai_app.py
+++ b/tests/test_components/test_ai_app.py
@@ -165,6 +165,7 @@ def test_update_app_plan_non_existent_path(self):
 
 @pytest_mark_class("llm")
 class TestUpdatePlan:
+    @pytest.mark.flaky(max_runs=3)
     def test_keep_app_plan(self):
         app = AIApplication(
             name="Zoo planner app",