Improve instructions generation for success tool

src/controlflow/tasks/task.py

@@ -582,9 +582,7 @@ def get_success_tool(self) -> Tool:
         Create an agent-compatible tool for marking this task as successful.
         """
         options = {}
-        instructions = unwrap("""
-            Use this tool to mark the task as successful and provide a result.
-        """)
+        instructions = None
         result_schema = None
 
         # if the result_type is a tuple of options, then we want the LLM to provide
@@ -605,12 +603,14 @@ def get_success_tool(self) -> Tool:
             options_str = "\n\n".join(
                 f"Option {i}: {option}" for i, option in serialized_options.items()
             )
-            instructions += "\n\n" + unwrap("""
-                Provide a single integer as the result, corresponding to the index
+            instructions = unwrap(
+                """
+                Provide a single integer as the task result, corresponding to the index
                 of your chosen option. Your options are: 
                 
                 {options_str}
-                """).format(options_str=options_str)
+                """
+            ).format(options_str=options_str)
 
         # otherwise try to load the schema for the result type
         elif self.result_type is not None:
@@ -628,6 +628,11 @@ def get_success_tool(self) -> Tool:
 
         # for basemodel subclasses, we accept the model properties directly as kwargs
         if safe_issubclass(result_schema, BaseModel):
+            instructions = unwrap(
+                f"""
+                Use this tool to mark the task as successful and provide a result. The result schema is: {result_schema}
+                """
+            )
 
             def succeed(**kwargs) -> str:
                 self.mark_successful(result=result_schema(**kwargs))
@@ -642,29 +647,48 @@ def succeed(**kwargs) -> str:
             )
 
         # for all other results, we create a single `result` kwarg to capture the result
-        else:
+        elif result_schema is not None:
+            instructions = unwrap(
+                f"""
+                Use this tool to mark the task as successful and provide a result.
+                The result schema is: {{"task_result": {result_schema}}}
+                """
+            )
 
             @tool(
                 name=f"mark_task_{self.id}_successful",
                 description=f"Mark task {self.id} as successful.",
                 instructions=instructions,
                 include_return_description=False,
             )
-            def succeed(result: result_schema) -> str:  # type: ignore
+            def succeed(task_result: result_schema) -> str:  # type: ignore
                 if self.is_successful():
                     raise ValueError(
                         f"{self.friendly_name()} is already marked successful."
                     )
                 if options:
-                    if result not in options:
+                    if task_result not in options:
                         raise ValueError(
                             f"Invalid option. Please choose one of {options}"
                         )
-                    result = options[result]
-                self.mark_successful(result=result)
+                    task_result = options[task_result]
+                self.mark_successful(result=task_result)
+                return f"{self.friendly_name()} marked successful."
+
+        # for no result schema, we provide a tool that takes no arguments
+        else:
+
+            @tool(
+                name=f"mark_task_{self.id}_successful",
+                description=f"Mark task {self.id} as successful.",
+                instructions=instructions,
+                include_return_description=False,
+            )
+            def succeed() -> str:
+                self.mark_successful()
                 return f"{self.friendly_name()} marked successful."
 
-            return succeed
+        return succeed
 
     def get_fail_tool(self) -> Tool:
         """
@@ -673,8 +697,10 @@ def get_fail_tool(self) -> Tool:
 
         @tool(
             name=f"mark_task_{self.id}_failed",
-            description=(
-                f"Mark task {self.id} as failed. Only use when technical errors prevent success. Provide a detailed reason for the failure."
+            description=unwrap(
+                f"""Mark task {self.id} as failed. Only use when technical
+                 errors prevent success. Provide a detailed reason for the
+                 failure."""
             ),
             include_return_description=False,
         )