diff --git a/src/controlflow/settings.py b/src/controlflow/settings.py
index 4f4c8b0f..387753b1 100644
--- a/src/controlflow/settings.py
+++ b/src/controlflow/settings.py
@@ -12,7 +12,9 @@
 
 from controlflow.utilities.general import unwrap
 
-CONTROLFLOW_ENV_FILE = os.getenv("CONTROLFLOW_ENV_FILE", "~/.controlflow/.env")
+CONTROLFLOW_ENV_FILE = os.path.expanduser(
+    os.path.expandvars(os.getenv("CONTROLFLOW_ENV_FILE", "~/.controlflow/.env"))
+)
 
 
 class ControlFlowSettings(BaseSettings):
diff --git a/src/controlflow/tasks/task.py b/src/controlflow/tasks/task.py
index bf502492..44a55070 100644
--- a/src/controlflow/tasks/task.py
+++ b/src/controlflow/tasks/task.py
@@ -673,7 +673,8 @@ def get_success_tool(self) -> Tool:
             instructions.append(
                 unwrap(
                     f"""
-                    Use this tool to mark the task as successful and provide a result. The result schema is: {result_schema}
+                    Use this tool to mark the task as successful and provide a
+                    result. The result schema is: {result_schema}
                     """
                 )
             )
@@ -696,8 +697,9 @@ def succeed(**kwargs) -> str:
             instructions.append(
                 unwrap(
                     f"""
-                    Use this tool to mark the task as successful and provide a result with the `task_result` kwarg.
-                    The `task_result` schema is: {{"task_result": {result_schema}}}
+                    Use this tool to mark the task as successful and provide a
+                    `result` value. The `result` value has the following schema:
+                    {result_schema}.
                     """
                 )
             )
@@ -709,18 +711,18 @@ def succeed(**kwargs) -> str:
                 include_return_description=False,
                 metadata=metadata,
             )
-            def succeed(task_result: result_schema) -> str:  # type: ignore
+            def succeed(result: result_schema) -> str:  # type: ignore
                 if self.is_successful():
                     raise ValueError(
                         f"{self.friendly_name()} is already marked successful."
                     )
                 if options:
-                    if task_result not in options:
+                    if result not in options:
                         raise ValueError(
                             f"Invalid option. Please choose one of {options}"
                         )
-                    task_result = options[task_result]
-                self.mark_successful(result=task_result)
+                    result = options[result]
+                self.mark_successful(result=result)
                 return f"{self.friendly_name()} marked successful."
 
             return succeed
diff --git a/tests/tasks/test_tasks.py b/tests/tasks/test_tasks.py
index 52480232..fa6b2fb7 100644
--- a/tests/tasks/test_tasks.py
+++ b/tests/tasks/test_tasks.py
@@ -485,14 +485,14 @@ class TestSuccessTool:
     def test_success_tool(self):
         task = Task("choose 5", result_type=int)
         tool = task.get_success_tool()
-        tool.run(input=dict(task_result=5))
+        tool.run(input=dict(result=5))
         assert task.is_successful()
         assert task.result == 5
 
     def test_success_tool_with_list_of_options(self):
         task = Task('choose "good"', result_type=["bad", "good", "medium"])
         tool = task.get_success_tool()
-        tool.run(input=dict(task_result=1))
+        tool.run(input=dict(result=1))
         assert task.is_successful()
         assert task.result == "good"
 
@@ -500,12 +500,12 @@ def test_success_tool_with_list_of_options_requires_int(self):
         task = Task('choose "good"', result_type=["bad", "good", "medium"])
         tool = task.get_success_tool()
         with pytest.raises(ValueError):
-            tool.run(input=dict(task_result="good"))
+            tool.run(input=dict(result="good"))
 
     def test_tuple_of_ints_result(self):
         task = Task("choose 5", result_type=(4, 5, 6))
         tool = task.get_success_tool()
-        tool.run(input=dict(task_result=1))
+        tool.run(input=dict(result=1))
         assert task.result == 5
 
     def test_tuple_of_pydantic_models_result(self):
@@ -518,7 +518,7 @@ class Person(BaseModel):
             result_type=(Person(name="Alice", age=30), Person(name="Bob", age=35)),
         )
         tool = task.get_success_tool()
-        tool.run(input=dict(task_result=1))
+        tool.run(input=dict(result=1))
         assert task.result == Person(name="Bob", age=35)
         assert isinstance(task.result, Person)
 
@@ -604,7 +604,7 @@ def test_invalid_completion_tool(self):
     def test_manual_success_tool(self):
         task = Task(objective="Test task", completion_tools=[], result_type=int)
         success_tool = task.get_success_tool()
-        success_tool.run(input=dict(task_result=5))
+        success_tool.run(input=dict(result=5))
         assert task.is_successful()
         assert task.result == 5
 
diff --git a/tests/test_run.py b/tests/test_run.py
index c8f1cabd..a78e37a0 100644
--- a/tests/test_run.py
+++ b/tests/test_run.py
@@ -191,7 +191,7 @@ def task(self, default_fake_llm):
             tool_calls=[
                 {
                     "name": "mark_task_12345_successful",
-                    "args": {"task_result": "Hello!"},
+                    "args": {"result": "Hello!"},
                     "id": "call_ZEPdV8mCgeBe5UHjKzm6e3pe",
                     "type": "tool_call",
                 }
diff --git a/tests/utilities/test_testing.py b/tests/utilities/test_testing.py
index 380bdd5f..e4acefd3 100644
--- a/tests/utilities/test_testing.py
+++ b/tests/utilities/test_testing.py
@@ -20,7 +20,7 @@ def test_record_task_events(default_fake_llm):
         tool_calls=[
             {
                 "name": "mark_task_12345_successful",
-                "args": {"task_result": "Hello!"},
+                "args": {"result": "Hello!"},
                 "id": "call_ZEPdV8mCgeBe5UHjKzm6e3pe",
                 "type": "tool_call",
             }
@@ -39,7 +39,7 @@ def test_record_task_events(default_fake_llm):
     assert events[3].event == "tool-result"
     assert events[3].tool_result.tool_call == {
         "name": "mark_task_12345_successful",
-        "args": {"task_result": "Hello!"},
+        "args": {"result": "Hello!"},
         "id": "call_ZEPdV8mCgeBe5UHjKzm6e3pe",
         "type": "tool_call",
     }