diff --git a/agents-api/agents_api/autogen/Tasks.py b/agents-api/agents_api/autogen/Tasks.py
index b9212d8cb..faf045edf 100644
--- a/agents-api/agents_api/autogen/Tasks.py
+++ b/agents-api/agents_api/autogen/Tasks.py
@@ -236,7 +236,7 @@ class EvaluateStep(BaseModel):
     """
     The label of this step for referencing it from other steps
     """
-    evaluate: dict[str, list[str] | dict[str, str] | list[dict[str, str]] | str]
+    evaluate: dict[str, Any]
     """
     The expression to evaluate
     """
@@ -837,10 +837,7 @@ class ReturnStep(BaseModel):
     """
     The label of this step for referencing it from other steps
     """
-    return_: Annotated[
-        dict[str, list[str] | dict[str, str] | list[dict[str, str]] | str],
-        Field(alias="return"),
-    ]
+    return_: Annotated[dict[str, Any], Field(alias="return")]
     """
     The value to return
     """
@@ -860,7 +857,7 @@ class SetStep(BaseModel):
     """
     The label of this step for referencing it from other steps
     """
-    set: dict[str, str]
+    set: dict[str, Any]
     """
     The value to set
     """
@@ -1046,25 +1043,7 @@ class ToolCallStep(BaseModel):
     """
     The tool to run
     """
-    arguments: (
-        dict[
-            str,
-            dict[str, list[str] | dict[str, str] | list[dict[str, str]] | str]
-            | list[dict[str, list[str] | dict[str, str] | list[dict[str, str]] | str]]
-            | str,
-        ]
-        | list[
-            dict[
-                str,
-                dict[str, list[str] | dict[str, str] | list[dict[str, str]] | str]
-                | list[
-                    dict[str, list[str] | dict[str, str] | list[dict[str, str]] | str]
-                ]
-                | str,
-            ]
-        ]
-        | Literal["_"]
-    ) = "_"
+    arguments: dict[str, Any] | Literal["_"] = "_"
     """
     The input parameters for the tool (defaults to last step output)
     """
@@ -1168,7 +1147,7 @@ class WaitForInputInfo(BaseModel):
     model_config = ConfigDict(
         populate_by_name=True,
     )
-    info: dict[str, list[str] | dict[str, str] | list[dict[str, str]] | str]
+    info: dict[str, Any]
     """
     Any additional info or data
     """
@@ -1213,10 +1192,7 @@ class YieldStep(BaseModel):
     The subworkflow to run.
     VALIDATION: Should resolve to a defined subworkflow.
     """
-    arguments: (
-        dict[str, list[str] | dict[str, str] | list[dict[str, str]] | str]
-        | Literal["_"]
-    ) = "_"
+    arguments: dict[str, Any] | Literal["_"] = "_"
     """
     The input parameters for the subworkflow (defaults to last step output)
     """
diff --git a/integrations-service/integrations/autogen/Tasks.py b/integrations-service/integrations/autogen/Tasks.py
index 8e98caaab..fceded307 100644
--- a/integrations-service/integrations/autogen/Tasks.py
+++ b/integrations-service/integrations/autogen/Tasks.py
@@ -237,7 +237,7 @@ class EvaluateStep(BaseModel):
     """
     The label of this step for referencing it from other steps
     """
-    evaluate: dict[str, list[str] | dict[str, str] | list[dict[str, str]] | str]
+    evaluate: dict[str, Any]
     """
     The expression to evaluate
     """
@@ -838,10 +838,7 @@ class ReturnStep(BaseModel):
     """
     The label of this step for referencing it from other steps
     """
-    return_: Annotated[
-        dict[str, list[str] | dict[str, str] | list[dict[str, str]] | str],
-        Field(alias="return"),
-    ]
+    return_: Annotated[dict[str, Any], Field(alias="return")]
     """
     The value to return
     """
@@ -861,7 +858,7 @@ class SetStep(BaseModel):
     """
     The label of this step for referencing it from other steps
     """
-    set: dict[str, str]
+    set: dict[str, Any]
     """
     The value to set
     """
@@ -1047,25 +1044,7 @@ class ToolCallStep(BaseModel):
     """
     The tool to run
     """
-    arguments: (
-        dict[
-            str,
-            dict[str, list[str] | dict[str, str] | list[dict[str, str]] | str]
-            | list[dict[str, list[str] | dict[str, str] | list[dict[str, str]] | str]]
-            | str,
-        ]
-        | list[
-            dict[
-                str,
-                dict[str, list[str] | dict[str, str] | list[dict[str, str]] | str]
-                | list[
-                    dict[str, list[str] | dict[str, str] | list[dict[str, str]] | str]
-                ]
-                | str,
-            ]
-        ]
-        | Literal["_"]
-    ) = "_"
+    arguments: dict[str, Any] | Literal["_"] = "_"
     """
     The input parameters for the tool (defaults to last step output)
     """
@@ -1169,7 +1148,7 @@ class WaitForInputInfo(BaseModel):
     model_config = ConfigDict(
         populate_by_name=True,
     )
-    info: dict[str, list[str] | dict[str, str] | list[dict[str, str]] | str]
+    info: dict[str, Any]
     """
     Any additional info or data
     """
@@ -1214,10 +1193,7 @@ class YieldStep(BaseModel):
     The subworkflow to run.
     VALIDATION: Should resolve to a defined subworkflow.
     """
-    arguments: (
-        dict[str, list[str] | dict[str, str] | list[dict[str, str]] | str]
-        | Literal["_"]
-    ) = "_"
+    arguments: dict[str, Any] | Literal["_"] = "_"
     """
     The input parameters for the subworkflow (defaults to last step output)
     """
diff --git a/typespec/tasks/steps.tsp b/typespec/tasks/steps.tsp
index a7c877401..a251638fb 100644
--- a/typespec/tasks/steps.tsp
+++ b/typespec/tasks/steps.tsp
@@ -28,14 +28,6 @@ alias TypedExpression<T> = PyExpression;
 /** A python expression that takes an accumulator `results` and an input item `_` and reduces them. */
 alias ReduceExpression<Value = unknown, Accumulator = Array<Value>> = TypedExpression<Accumulator>;
 
-/** A string->string object where the values are python expressions that get evaluated to give a final object. */
-alias ExpressionObject<T> = Record<TypedExpression<T> | TypedExpression<T>[] | Record<TypedExpression<T>> | Record<TypedExpression<T>>[]>;
-
-alias NestedExpression<T> = Record<TypedExpression<T> | ExpressionObject<T> | ExpressionObject<T>[]>;
-
-/** Nested expression object. */
-alias NestedExpressionObject<T> = NestedExpression<T> | NestedExpression<T>[];
-
 @discriminator("kind_")
 model BaseWorkflowStep<T extends valueof WorkflowStepKind> {
     /** The kind of step */
@@ -88,7 +80,7 @@ model ToolCallStepDef {
     tool: validPythonIdentifier;
 
     /** The input parameters for the tool (defaults to last step output) */
-    arguments: NestedExpressionObject<unknown> | "_" = "_";
+    arguments: Record<unknown> | "_" = "_";
 }
 
 model PromptStep extends BaseWorkflowStep<"prompt"> {
@@ -134,7 +126,7 @@ model EvaluateStep extends BaseWorkflowStep<"evaluate"> {
 
 model EvaluateStepDef {
     /** The expression to evaluate */
-    evaluate: ExpressionObject<unknown>;
+    evaluate: Record<unknown>;
 }
 
 model WaitForInputStep extends BaseWorkflowStep<"wait_for_input"> {
@@ -146,7 +138,7 @@ model WaitForInputStep extends BaseWorkflowStep<"wait_for_input"> {
 
 model WaitForInputInfo {
     /** Any additional info or data */
-    info: ExpressionObject<unknown>;
+    info: Record<unknown>;
 }
 
 model WaitForInputStepDef {
@@ -191,7 +183,7 @@ model SetStep extends BaseWorkflowStep<"set"> {
 
 model SetStepDef {
     /** The value to set */
-    set: Record<TypedExpression<unknown>>;
+    set: Record<unknown>;
 }
 
 ///////////////////////
@@ -317,7 +309,7 @@ model YieldStepDef {
     workflow: string;
 
     /** The input parameters for the subworkflow (defaults to last step output) */
-    arguments: ExpressionObject<unknown> | "_" = "_";
+    arguments: Record<unknown> | "_" = "_";
 }
 
 model ErrorWorkflowStep extends BaseWorkflowStep<"error"> {
@@ -375,5 +367,5 @@ model ReturnStep extends BaseWorkflowStep<"return"> {
 
 model ReturnStepDef {
     /** The value to return */
-    `return`: ExpressionObject<unknown>;
+    `return`: Record<unknown>;
 }
diff --git a/typespec/tsp-output/@typespec/openapi3/openapi-1.0.0.yaml b/typespec/tsp-output/@typespec/openapi3/openapi-1.0.0.yaml
index 5c9a57c4c..0b7971de4 100644
--- a/typespec/tsp-output/@typespec/openapi3/openapi-1.0.0.yaml
+++ b/typespec/tsp-output/@typespec/openapi3/openapi-1.0.0.yaml
@@ -4629,20 +4629,7 @@ components:
           readOnly: true
         evaluate:
           type: object
-          additionalProperties:
-            anyOf:
-              - $ref: '#/components/schemas/Common.PyExpression'
-              - type: array
-                items:
-                  $ref: '#/components/schemas/Common.PyExpression'
-              - type: object
-                additionalProperties:
-                  $ref: '#/components/schemas/Common.PyExpression'
-              - type: array
-                items:
-                  type: object
-                  additionalProperties:
-                    $ref: '#/components/schemas/Common.PyExpression'
+          additionalProperties: {}
           description: The expression to evaluate
       allOf:
         - type: object
@@ -5608,20 +5595,7 @@ components:
           readOnly: true
         return:
           type: object
-          additionalProperties:
-            anyOf:
-              - $ref: '#/components/schemas/Common.PyExpression'
-              - type: array
-                items:
-                  $ref: '#/components/schemas/Common.PyExpression'
-              - type: object
-                additionalProperties:
-                  $ref: '#/components/schemas/Common.PyExpression'
-              - type: array
-                items:
-                  type: object
-                  additionalProperties:
-                    $ref: '#/components/schemas/Common.PyExpression'
+          additionalProperties: {}
           description: The value to return
       allOf:
         - type: object
@@ -5654,8 +5628,7 @@ components:
           readOnly: true
         set:
           type: object
-          additionalProperties:
-            $ref: '#/components/schemas/Common.PyExpression'
+          additionalProperties: {}
           description: The value to set
       allOf:
         - type: object
@@ -6039,79 +6012,7 @@ components:
         arguments:
           anyOf:
             - type: object
-              additionalProperties:
-                anyOf:
-                  - $ref: '#/components/schemas/Common.PyExpression'
-                  - type: object
-                    additionalProperties:
-                      anyOf:
-                        - $ref: '#/components/schemas/Common.PyExpression'
-                        - type: array
-                          items:
-                            $ref: '#/components/schemas/Common.PyExpression'
-                        - type: object
-                          additionalProperties:
-                            $ref: '#/components/schemas/Common.PyExpression'
-                        - type: array
-                          items:
-                            type: object
-                            additionalProperties:
-                              $ref: '#/components/schemas/Common.PyExpression'
-                  - type: array
-                    items:
-                      type: object
-                      additionalProperties:
-                        anyOf:
-                          - $ref: '#/components/schemas/Common.PyExpression'
-                          - type: array
-                            items:
-                              $ref: '#/components/schemas/Common.PyExpression'
-                          - type: object
-                            additionalProperties:
-                              $ref: '#/components/schemas/Common.PyExpression'
-                          - type: array
-                            items:
-                              type: object
-                              additionalProperties:
-                                $ref: '#/components/schemas/Common.PyExpression'
-            - type: array
-              items:
-                type: object
-                additionalProperties:
-                  anyOf:
-                    - $ref: '#/components/schemas/Common.PyExpression'
-                    - type: object
-                      additionalProperties:
-                        anyOf:
-                          - $ref: '#/components/schemas/Common.PyExpression'
-                          - type: array
-                            items:
-                              $ref: '#/components/schemas/Common.PyExpression'
-                          - type: object
-                            additionalProperties:
-                              $ref: '#/components/schemas/Common.PyExpression'
-                          - type: array
-                            items:
-                              type: object
-                              additionalProperties:
-                                $ref: '#/components/schemas/Common.PyExpression'
-                    - type: array
-                      items:
-                        type: object
-                        additionalProperties:
-                          anyOf:
-                            - $ref: '#/components/schemas/Common.PyExpression'
-                            - type: array
-                              items:
-                                $ref: '#/components/schemas/Common.PyExpression'
-                            - type: object
-                              additionalProperties:
-                                $ref: '#/components/schemas/Common.PyExpression'
-                            - type: array
-                              items:
-                                type: object
-                                additionalProperties:
-                                  $ref: '#/components/schemas/Common.PyExpression'
+              additionalProperties: {}
             - type: string
               enum:
                 - _
@@ -6354,20 +6255,7 @@ components:
       properties:
         info:
           type: object
-          additionalProperties:
-            anyOf:
-              - $ref: '#/components/schemas/Common.PyExpression'
-              - type: array
-                items:
-                  $ref: '#/components/schemas/Common.PyExpression'
-              - type: object
-                additionalProperties:
-                  $ref: '#/components/schemas/Common.PyExpression'
-              - type: array
-                items:
-                  type: object
-                  additionalProperties:
-                    $ref: '#/components/schemas/Common.PyExpression'
+          additionalProperties: {}
           description: Any additional info or data
     Tasks.WaitForInputStep:
       type: object
@@ -6423,20 +6311,7 @@ components:
         arguments:
           anyOf:
             - type: object
-              additionalProperties:
-                anyOf:
-                  - $ref: '#/components/schemas/Common.PyExpression'
-                  - type: array
-                    items:
-                      $ref: '#/components/schemas/Common.PyExpression'
-                  - type: object
-                    additionalProperties:
-                      $ref: '#/components/schemas/Common.PyExpression'
-                  - type: array
-                    items:
-                      type: object
-                      additionalProperties:
-                        $ref: '#/components/schemas/Common.PyExpression'
+              additionalProperties: {}
             - type: string
               enum:
                 - _