Add bedrock command r models (#4521)

Co-authored-by: Justin Wu <justin.wu@ringcentral.com>
Co-authored-by: Chenhe Gu <guchenhe@gmail.com>

api/core/agent/output_parser/cot_output_parser.py

@@ -17,6 +17,10 @@ class CotAgentOutputParser:
                 action_name = None
                 action_input = None
 
+                # cohere always returns a list
+                if isinstance(action, list) and len(action) == 1:
+                    action = action[0]
+
                 for key, value in action.items():
                     if 'input' in key.lower():
                         action_input = value