diff --git a/answer_rocket/__init__.py b/answer_rocket/__init__.py
index 71ee6d2..21947cb 100644
--- a/answer_rocket/__init__.py
+++ b/answer_rocket/__init__.py
@@ -5,7 +5,7 @@
     'MetaDataFrame'
 ]
 
-__version__ = "0.2.77"
+__version__ = "0.2.78"
 
 from answer_rocket.client import AnswerRocketClient
 from answer_rocket.error import AnswerRocketClientError
diff --git a/answer_rocket/skill.py b/answer_rocket/skill.py
index 92a0b66..72a10bf 100644
--- a/answer_rocket/skill.py
+++ b/answer_rocket/skill.py
@@ -24,7 +24,7 @@ def __init__(self, config: ClientConfig, gql_client: GraphQlClient):
         self._config = config
         self._gql_client = gql_client
 
-    def run(self, copilot_id: str, skill_name: str, parameters: dict | None = None, validate_parameters: bool = False, tool_definition: dict | None = None) -> RunSkillResult:
+    def run(self, copilot_id: str, skill_name: str, parameters: dict | None = None, validate_parameters: bool = False) -> RunSkillResult:
         """
         Runs a skill and returns its full output (does not stream intermediate skill output).
 
@@ -33,15 +33,10 @@ def run(self, copilot_id: str, skill_name: str, parameters: dict | None = None,
         :param parameters: a dict of parameters to pass to the skill where keys are the param keys and values are the values
          to populate them with
         :param validate_parameters: boolean switch which applies guardrails to the parameters before the skill is run
-        :param tool_definition: a dictionary of the hydrated report corresponding to the skill.b Can be fetched from config.get_copilot_hydrated_reports. Required when validate_parameters is True
-
 
         :return the full output object of the skill
         """
 
-        if validate_parameters and tool_definition is None:
-            raise ValueError("tool_definition is required when validate_parameters is True")
-
         final_result = RunSkillResult(None)
 
         preview_query_args = {
@@ -49,7 +44,6 @@ def run(self, copilot_id: str, skill_name: str, parameters: dict | None = None,
             "skillName": skill_name,
             'parameters': parameters or {},
             'validateParameters': validate_parameters,
-            'toolDefinition': tool_definition or {},
         }
 
         preview_query_vars = {
@@ -57,7 +51,6 @@ def run(self, copilot_id: str, skill_name: str, parameters: dict | None = None,
             'skill_name': Arg(non_null(String)),
             'parameters': Arg(JSON),
             'validate_parameters': Arg(Boolean),
-            'tool_definition': Arg(JSON),
         }
 
         operation = self._gql_client.query(variables=preview_query_vars)
@@ -67,7 +60,6 @@ def run(self, copilot_id: str, skill_name: str, parameters: dict | None = None,
             skill_name=Variable('skill_name'),
             parameters=Variable('parameters'),
             validate_parameters=Variable('validate_parameters'),
-            tool_definition=Variable('tool_definition'),
         )
 
         try: