diff --git a/src/google/adk/evaluation/evaluation_generator.py b/src/google/adk/evaluation/evaluation_generator.py
index 3d93659..3a43098 100644
--- a/src/google/adk/evaluation/evaluation_generator.py
+++ b/src/google/adk/evaluation/evaluation_generator.py
@@ -42,10 +42,10 @@ class EvaluationGenerator:
     """Returns evaluation responses for the given dataset and agent.
 
     Args:
-      eval_dataset: The dataset that needs to be scraped for resposnes.
+      eval_dataset: The dataset that needs to be scraped for responses.
       agent_module_path: Path to the module that contains the root agent.
       repeat_num: Number of time the eval dataset should be repeated. This is
-        usually done to remove uncertainity that a single run may bring.
+        usually done to remove uncertainty that a single run may bring.
       agent_name: The name of the agent that should be evaluated. This is
         usually the sub-agent.
       initial_session: Initial session for the eval data.
@@ -253,8 +253,8 @@ class EvaluationGenerator:
       all_mock_tools: set[str],
   ):
     """Recursively apply the before_tool_callback to the root agent and all its subagents."""
-    # check if the agent has tools that defined by evalset
-    # We use function name to check if tools match
+    # Check if the agent has tools that are defined by evalset.
+    # We use function names to check if tools match
     if not isinstance(agent, Agent) and not isinstance(agent, LlmAgent):
       return
 
diff --git a/src/google/adk/events/event.py b/src/google/adk/events/event.py
index e6a8aba..c2ff07d 100644
--- a/src/google/adk/events/event.py
+++ b/src/google/adk/events/event.py
@@ -70,7 +70,7 @@ class Event(LlmResponse):
   agent_2, and agent_2 is the parent of agent_3.
 
   Branch is used when multiple sub-agent shouldn't see their peer agents'
-  conversaction history.
+  conversation history.
   """
 
   # The following are computed fields.
@@ -94,7 +94,7 @@ class Event(LlmResponse):
         not self.get_function_calls()
         and not self.get_function_responses()
         and not self.partial
-        and not self.has_trailing_code_exeuction_result()
+        and not self.has_trailing_code_execution_result()
     )
 
   def get_function_calls(self) -> list[types.FunctionCall]:
@@ -115,7 +115,7 @@ class Event(LlmResponse):
           func_response.append(part.function_response)
     return func_response
 
-  def has_trailing_code_exeuction_result(
+  def has_trailing_code_execution_result(
       self,
   ) -> bool:
     """Returns whether the event has a trailing code execution result."""
diff --git a/src/google/adk/planners/plan_re_act_planner.py b/src/google/adk/planners/plan_re_act_planner.py
index 87da2a5..2e236a6 100644
--- a/src/google/adk/planners/plan_re_act_planner.py
+++ b/src/google/adk/planners/plan_re_act_planner.py
@@ -31,9 +31,9 @@ FINAL_ANSWER_TAG = '/*FINAL_ANSWER*/'
 
 
 class PlanReActPlanner(BasePlanner):
-  """Plan-Re-Act planner that constraints the LLM response to generate a plan before any action/observation.
+  """Plan-Re-Act planner that constrains the LLM response to generate a plan before any action/observation.
 
-  Note: this planner does not require the model to support buil-in thinking
+  Note: this planner does not require the model to support built-in thinking
   features or setting the thinking config.
   """
 
diff --git a/src/google/adk/runners.py b/src/google/adk/runners.py
index 7204f92..9041957 100644
--- a/src/google/adk/runners.py
+++ b/src/google/adk/runners.py
@@ -108,7 +108,7 @@ class Runner:
     """Runs the agent.
 
     NOTE: This sync interface is only for local testing and convenience purpose.
-    Consider to use `run_async` for production usage.
+    Consider using `run_async` for production usage.
 
     Args:
       user_id: The user ID of the session.
diff --git a/src/google/adk/sessions/state.py b/src/google/adk/sessions/state.py
index a333a17..b9c4f4b 100644
--- a/src/google/adk/sessions/state.py
+++ b/src/google/adk/sessions/state.py
@@ -49,7 +49,7 @@ class State:
     return key in self._value or key in self._delta
 
   def has_delta(self) -> bool:
-    """Whether the state has pending detla."""
+    """Whether the state has pending delta."""
     return bool(self._delta)
 
   def get(self, key: str, default: Any = None) -> Any:
diff --git a/src/google/adk/tests/integration/utils/asserts.py b/src/google/adk/tests/integration/utils/asserts.py
index 98d25b8..c367016 100644
--- a/src/google/adk/tests/integration/utils/asserts.py
+++ b/src/google/adk/tests/integration/utils/asserts.py
@@ -36,21 +36,21 @@ def assert_agent_says(
 
 
 def assert_agent_says_in_order(
-    expected_conversaction: list[Message], agent_runner: TestRunner
+    expected_conversation: list[Message], agent_runner: TestRunner
 ):
-  expected_conversaction_idx = len(expected_conversaction) - 1
+  expected_conversation_idx = len(expected_conversation) - 1
   for event in reversed(agent_runner.get_events()):
     if event.content.parts and event.content.parts[0].text:
       assert (
           event.author
-          == expected_conversaction[expected_conversaction_idx]['agent_name']
+          == expected_conversation[expected_conversation_idx]['agent_name']
       )
       assert (
           event.content.parts[0].text.strip()
-          == expected_conversaction[expected_conversaction_idx]['expected_text']
+          == expected_conversation[expected_conversation_idx]['expected_text']
       )
-      expected_conversaction_idx -= 1
-      if expected_conversaction_idx < 0:
+      expected_conversation_idx -= 1
+      if expected_conversation_idx < 0:
         return
 
 
diff --git a/src/google/adk/tests/integration/utils/test_runner.py b/src/google/adk/tests/integration/utils/test_runner.py
index 13e7566..9ac7c32 100644
--- a/src/google/adk/tests/integration/utils/test_runner.py
+++ b/src/google/adk/tests/integration/utils/test_runner.py
@@ -27,7 +27,7 @@ from google.genai import types
 
 
 class TestRunner:
-  """Agents runner for testings."""
+  """Agents runner for testing."""
 
   app_name = "test_app"
   user_id = "test_user"
diff --git a/src/google/adk/tools/function_parameter_parse_util.py b/src/google/adk/tools/function_parameter_parse_util.py
index 4252c4f..21e192d 100644
--- a/src/google/adk/tools/function_parameter_parse_util.py
+++ b/src/google/adk/tools/function_parameter_parse_util.py
@@ -53,7 +53,7 @@ def _raise_for_any_of_if_mldev(schema: types.Schema):
 
 def _update_for_default_if_mldev(schema: types.Schema):
   if schema.default is not None:
-    # TODO(kech): Remove this walkaround once mldev supports default value.
+    # TODO(kech): Remove this workaround once mldev supports default value.
     schema.default = None
     logger.warning(
         'Default value is not supported in function declaration schema for'
diff --git a/tests/unittests/tools/test_build_function_declaration.py b/tests/unittests/tools/test_build_function_declaration.py
index d71d6d2..508608c 100644
--- a/tests/unittests/tools/test_build_function_declaration.py
+++ b/tests/unittests/tools/test_build_function_declaration.py
@@ -267,11 +267,11 @@ def test_basemodel_list():
 # TODO: comment out this test for now as crewai requires python 3.10 as minimum
 # def test_crewai_tool():
 #   docs_tool = CrewaiTool(
-#       name='direcotry_read_tool',
+#       name='directory_read_tool',
 #       description='use this to find files for you.',
 #       tool=FileReadTool(),
 #   )
 #   function_decl = docs_tool.get_declaration()
-#   assert function_decl.name == 'direcotry_read_tool'
+#   assert function_decl.name == 'directory_read_tool'
 #   assert function_decl.parameters.type == 'OBJECT'
 #   assert function_decl.parameters.properties['file_path'].type == 'STRING'