diff --git a/docs/_static/llama-stack-spec.html b/docs/_static/llama-stack-spec.html
index 7ba26acb7..817a65ca8 100644
--- a/docs/_static/llama-stack-spec.html
+++ b/docs/_static/llama-stack-spec.html
@@ -2426,7 +2426,14 @@
             "post": {
                 "responses": {
                     "200": {
-                        "description": "OK"
+                        "description": "OK",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "$ref": "#/components/schemas/Benchmark"
+                                }
+                            }
+                        }
                     },
                     "400": {
                         "$ref": "#/components/responses/BadRequest400"
@@ -2444,7 +2451,7 @@
                 "tags": [
                     "Benchmarks"
                 ],
-                "description": "",
+                "description": "Register a new benchmark.",
                 "parameters": [],
                 "requestBody": {
                     "content": {
@@ -7098,13 +7105,15 @@
                         "default": "benchmark"
                     },
                     "dataset_id": {
-                        "type": "string"
+                        "type": "string",
+                        "description": "The ID of the dataset to used to run the benchmark."
                     },
                     "scoring_functions": {
                         "type": "array",
                         "items": {
-                            "type": "string"
-                        }
+                            "$ref": "#/components/schemas/ScoringFnParams"
+                        },
+                        "description": "The scoring functions with parameters to use for this benchmark."
                     },
                     "metadata": {
                         "type": "object",
@@ -7129,7 +7138,8 @@
                                     "type": "object"
                                 }
                             ]
-                        }
+                        },
+                        "description": "Metadata for this benchmark for additional descriptions."
                     }
                 },
                 "additionalProperties": false,
@@ -9448,23 +9458,20 @@
             "RegisterBenchmarkRequest": {
                 "type": "object",
                 "properties": {
-                    "benchmark_id": {
-                        "type": "string"
-                    },
                     "dataset_id": {
-                        "type": "string"
+                        "type": "string",
+                        "description": "The ID of the dataset to used to run the benchmark."
                     },
                     "scoring_functions": {
                         "type": "array",
                         "items": {
-                            "type": "string"
-                        }
+                            "$ref": "#/components/schemas/ScoringFnParams"
+                        },
+                        "description": "The scoring functions with parameters to use for this benchmark."
                     },
-                    "provider_benchmark_id": {
-                        "type": "string"
-                    },
-                    "provider_id": {
-                        "type": "string"
+                    "benchmark_id": {
+                        "type": "string",
+                        "description": "(Optional) The ID of the benchmark to register. If not provided, a random ID will be generated."
                     },
                     "metadata": {
                         "type": "object",
@@ -9489,12 +9496,12 @@
                                     "type": "object"
                                 }
                             ]
-                        }
+                        },
+                        "description": "(Optional) Metadata for this benchmark for additional descriptions."
                     }
                 },
                 "additionalProperties": false,
                 "required": [
-                    "benchmark_id",
                     "dataset_id",
                     "scoring_functions"
                 ],
diff --git a/docs/_static/llama-stack-spec.yaml b/docs/_static/llama-stack-spec.yaml
index e37c49100..62fb02651 100644
--- a/docs/_static/llama-stack-spec.yaml
+++ b/docs/_static/llama-stack-spec.yaml
@@ -1635,6 +1635,10 @@ paths:
       responses:
         '200':
           description: OK
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Benchmark'
         '400':
           $ref: '#/components/responses/BadRequest400'
         '429':
@@ -1647,7 +1651,7 @@ paths:
           $ref: '#/components/responses/DefaultError'
       tags:
         - Benchmarks
-      description: ''
+      description: Register a new benchmark.
       parameters: []
       requestBody:
         content:
@@ -4950,10 +4954,14 @@ components:
           default: benchmark
         dataset_id:
           type: string
+          description: >-
+            The ID of the dataset to used to run the benchmark.
         scoring_functions:
           type: array
           items:
-            type: string
+            $ref: '#/components/schemas/ScoringFnParams'
+          description: >-
+            The scoring functions with parameters to use for this benchmark.
         metadata:
           type: object
           additionalProperties:
@@ -4964,6 +4972,8 @@ components:
               - type: string
               - type: array
               - type: object
+          description: >-
+            Metadata for this benchmark for additional descriptions.
       additionalProperties: false
       required:
         - identifier
@@ -6438,18 +6448,21 @@ components:
     RegisterBenchmarkRequest:
       type: object
       properties:
-        benchmark_id:
-          type: string
         dataset_id:
           type: string
+          description: >-
+            The ID of the dataset to used to run the benchmark.
         scoring_functions:
           type: array
           items:
-            type: string
-        provider_benchmark_id:
-          type: string
-        provider_id:
+            $ref: '#/components/schemas/ScoringFnParams'
+          description: >-
+            The scoring functions with parameters to use for this benchmark.
+        benchmark_id:
           type: string
+          description: >-
+            (Optional) The ID of the benchmark to register. If not provided, a random
+            ID will be generated.
         metadata:
           type: object
           additionalProperties:
@@ -6460,9 +6473,10 @@ components:
               - type: string
               - type: array
               - type: object
+          description: >-
+            (Optional) Metadata for this benchmark for additional descriptions.
       additionalProperties: false
       required:
-        - benchmark_id
         - dataset_id
         - scoring_functions
       title: RegisterBenchmarkRequest
diff --git a/llama_stack/apis/benchmarks/benchmarks.py b/llama_stack/apis/benchmarks/benchmarks.py
index 39ba355e9..6738a6653 100644
--- a/llama_stack/apis/benchmarks/benchmarks.py
+++ b/llama_stack/apis/benchmarks/benchmarks.py
@@ -8,15 +8,22 @@ from typing import Any, Dict, List, Literal, Optional, Protocol, runtime_checkab
 from pydantic import BaseModel, Field
 
 from llama_stack.apis.resource import Resource, ResourceType
+from llama_stack.apis.scoring_functions import ScoringFnParams
 from llama_stack.schema_utils import json_schema_type, webmethod
 
 
 class CommonBenchmarkFields(BaseModel):
+    """
+    :param dataset_id: The ID of the dataset to used to run the benchmark.
+    :param scoring_functions: The scoring functions with parameters to use for this benchmark.
+    :param metadata: Metadata for this benchmark for additional descriptions.
+    """
+
     dataset_id: str
-    scoring_functions: List[str]
+    scoring_functions: List[ScoringFnParams]
     metadata: Dict[str, Any] = Field(
         default_factory=dict,
-        description="Metadata for this evaluation task",
+        description="Metadata for this benchmark",
     )
 
 
@@ -57,10 +64,17 @@ class Benchmarks(Protocol):
     @webmethod(route="/eval/benchmarks", method="POST")
     async def register_benchmark(
         self,
-        benchmark_id: str,
         dataset_id: str,
-        scoring_functions: List[str],
-        provider_benchmark_id: Optional[str] = None,
-        provider_id: Optional[str] = None,
+        scoring_functions: List[ScoringFnParams],
+        benchmark_id: Optional[str] = None,
         metadata: Optional[Dict[str, Any]] = None,
-    ) -> None: ...
+    ) -> Benchmark:
+        """
+        Register a new benchmark.
+
+        :param dataset_id: The ID of the dataset to used to run the benchmark.
+        :param scoring_functions: The scoring functions with parameters to use for this benchmark.
+        :param benchmark_id: (Optional) The ID of the benchmark to register. If not provided, a random ID will be generated.
+        :param metadata: (Optional) Metadata for this benchmark for additional descriptions.
+        """
+        ...