diff --git a/docs/media-buy/index.md b/docs/media-buy/index.md
index 395a324a38..5a9d778318 100644
--- a/docs/media-buy/index.md
+++ b/docs/media-buy/index.md
@@ -124,6 +124,7 @@ Detailed implementation guidance:
 - **[Task Reference](./tasks/get_products.md)** - Complete task documentation with examples
 - **[Design Decisions](design-decisions.md)** - Architectural choices and rationale
 - **[Testing and Development](testing.md)** - Time simulation and dry run capabilities for faster development
+- **[Protocol Test Harness](https://storylab.scope3.com/sales-agents)** - Interactive tool for validating AdCP implementation compliance
 
 ## Getting Started
 
diff --git a/docs/media-buy/testing.md b/docs/media-buy/testing.md
index f63045f67b..0828b9dd70 100644
--- a/docs/media-buy/testing.md
+++ b/docs/media-buy/testing.md
@@ -4,6 +4,10 @@
 
 AdCP servers support time simulation and dry run capabilities to enable comprehensive testing of advertising workflows without waiting for real-time events or spending actual budgets.
 
+## Protocol Compliance Testing
+
+Use the [AdCP Protocol Test Harness](https://storylab.scope3.com/sales-agents) to validate your implementation's compliance with the AdCP specification. This interactive tool allows you to test all AdCP tasks and verify correct behavior across different scenarios.
+
 ## Testing Modes
 
 ### Dry Run Mode
diff --git a/docs/reference/data-models.md b/docs/reference/data-models.md
index d906676fee..617ccac8f9 100644
--- a/docs/reference/data-models.md
+++ b/docs/reference/data-models.md
@@ -108,22 +108,23 @@ interface Targeting {
 }
 ```
 
-## Response Format
+## Protocol Response Format
 
-Standard response structure (MCP).
+Protocol-level response wrapper (MCP/A2A).
 
 **JSON Schema**: [`/schemas/v1/core/response.json`](/schemas/v1/core/response.json)
 
 ```typescript
-interface Response {
-  message: string;           // Human-readable summary
-  context_id?: string;        // Session continuity
-  data?: any;                // Operation-specific data
-  errors?: Error[];          // Non-fatal warnings
-  clarification_needed?: boolean;
+interface ProtocolResponse {
+  message: string;              // Human-readable summary (protocol level)
+  context_id?: string;          // Session continuity (protocol level)
+  data: any;                   // AdCP task-specific response data
+  errors?: Error[];            // Non-fatal warnings (protocol level)
 }
 ```
 
+**Note**: Individual AdCP task schemas contain only the application-level data that goes in the `data` field of the protocol response.
+
 ## Error
 
 Standard error structure.
diff --git a/static/schemas/v1/core/response.json b/static/schemas/v1/core/response.json
index a86a4f153d..cb37b3991b 100644
--- a/static/schemas/v1/core/response.json
+++ b/static/schemas/v1/core/response.json
@@ -1,8 +1,8 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
   "$id": "/schemas/v1/core/response.json",
-  "title": "Response",
-  "description": "Standard response structure (MCP)",
+  "title": "Protocol Response",
+  "description": "Protocol-level response wrapper (MCP/A2A) - contains AdCP task data plus protocol fields",
   "type": "object",
   "properties": {
     "message": {
@@ -14,7 +14,7 @@
       "description": "Session continuity identifier"
     },
     "data": {
-      "description": "Operation-specific data"
+      "description": "AdCP task-specific response data (see individual task response schemas)"
     },
     "errors": {
       "type": "array",
@@ -22,10 +22,6 @@
       "items": {
         "$ref": "/schemas/v1/core/error.json"
       }
-    },
-    "clarification_needed": {
-      "type": "boolean",
-      "description": "Whether clarification is needed"
     }
   },
   "required": ["message"],
diff --git a/static/schemas/v1/media-buy/add-creative-assets-response.json b/static/schemas/v1/media-buy/add-creative-assets-response.json
index 77ba5fea25..f5be8c0800 100644
--- a/static/schemas/v1/media-buy/add-creative-assets-response.json
+++ b/static/schemas/v1/media-buy/add-creative-assets-response.json
@@ -5,14 +5,6 @@
   "description": "Response payload for add_creative_assets task",
   "type": "object",
   "properties": {
-    "message": {
-      "type": "string",
-      "description": "Human-readable status message"
-    },
-    "context_id": {
-      "type": "string",
-      "description": "Session continuity identifier"
-    },
     "asset_statuses": {
       "type": "array",
       "description": "Array of status information for each uploaded asset",
diff --git a/static/schemas/v1/media-buy/create-media-buy-response.json b/static/schemas/v1/media-buy/create-media-buy-response.json
index 0212b3a74b..843045e3fb 100644
--- a/static/schemas/v1/media-buy/create-media-buy-response.json
+++ b/static/schemas/v1/media-buy/create-media-buy-response.json
@@ -5,14 +5,6 @@
   "description": "Response payload for create_media_buy task",
   "type": "object",
   "properties": {
-    "message": {
-      "type": "string",
-      "description": "Human-readable confirmation message"
-    },
-    "context_id": {
-      "type": "string",
-      "description": "Session continuity identifier"
-    },
     "media_buy_id": {
       "type": "string",
       "description": "Publisher's unique identifier for the created media buy"
diff --git a/static/schemas/v1/media-buy/get-media-buy-delivery-response.json b/static/schemas/v1/media-buy/get-media-buy-delivery-response.json
index 0b895e9148..41ec0bb20e 100644
--- a/static/schemas/v1/media-buy/get-media-buy-delivery-response.json
+++ b/static/schemas/v1/media-buy/get-media-buy-delivery-response.json
@@ -5,14 +5,6 @@
   "description": "Response payload for get_media_buy_delivery task",
   "type": "object",
   "properties": {
-    "message": {
-      "type": "string",
-      "description": "Human-readable summary of campaign performance"
-    },
-    "context_id": {
-      "type": "string",
-      "description": "Session continuity identifier"
-    },
     "reporting_period": {
       "type": "object",
       "description": "Date range for the report",
diff --git a/static/schemas/v1/media-buy/get-products-response.json b/static/schemas/v1/media-buy/get-products-response.json
index 1bc2fdecda..d36457fe24 100644
--- a/static/schemas/v1/media-buy/get-products-response.json
+++ b/static/schemas/v1/media-buy/get-products-response.json
@@ -5,31 +5,12 @@
   "description": "Response payload for get_products task",
   "type": "object",
   "properties": {
-    "message": {
-      "type": "string",
-      "description": "Human-readable summary of the response"
-    },
-    "context_id": {
-      "type": "string",
-      "description": "Session continuity identifier"
-    },
     "products": {
       "type": "array",
       "description": "Array of matching products",
       "items": {
         "$ref": "/schemas/v1/core/product.json"
       }
-    },
-    "clarification_needed": {
-      "type": "boolean",
-      "description": "Whether clarification is needed"
-    },
-    "errors": {
-      "type": "array",
-      "description": "Non-fatal warnings",
-      "items": {
-        "$ref": "/schemas/v1/core/error.json"
-      }
     }
   },
   "required": ["products"],
diff --git a/static/schemas/v1/media-buy/list-creative-formats-response.json b/static/schemas/v1/media-buy/list-creative-formats-response.json
index d67ca7c572..deeac0219b 100644
--- a/static/schemas/v1/media-buy/list-creative-formats-response.json
+++ b/static/schemas/v1/media-buy/list-creative-formats-response.json
@@ -5,14 +5,6 @@
   "description": "Response payload for list_creative_formats task",
   "type": "object",
   "properties": {
-    "message": {
-      "type": "string",
-      "description": "Human-readable summary of available formats"
-    },
-    "context_id": {
-      "type": "string",
-      "description": "Session continuity identifier"
-    },
     "formats": {
       "type": "array",
       "description": "Array of available creative formats",
diff --git a/static/schemas/v1/media-buy/update-media-buy-response.json b/static/schemas/v1/media-buy/update-media-buy-response.json
index 9ddb6c924d..f75794f1d8 100644
--- a/static/schemas/v1/media-buy/update-media-buy-response.json
+++ b/static/schemas/v1/media-buy/update-media-buy-response.json
@@ -5,14 +5,6 @@
   "description": "Response payload for update_media_buy task",
   "type": "object",
   "properties": {
-    "message": {
-      "type": "string",
-      "description": "Human-readable confirmation of changes made"
-    },
-    "context_id": {
-      "type": "string",
-      "description": "Session continuity identifier"
-    },
     "media_buy_id": {
       "type": "string",
       "description": "Publisher's identifier for the media buy"
diff --git a/static/schemas/v1/signals/activate-signal-response.json b/static/schemas/v1/signals/activate-signal-response.json
index 247bd614a1..976b27ec72 100644
--- a/static/schemas/v1/signals/activate-signal-response.json
+++ b/static/schemas/v1/signals/activate-signal-response.json
@@ -5,14 +5,6 @@
   "description": "Response payload for activate_signal task",
   "type": "object",
   "properties": {
-    "message": {
-      "type": "string",
-      "description": "Human-readable status message"
-    },
-    "context_id": {
-      "type": "string",
-      "description": "Session continuity identifier"
-    },
     "task_id": {
       "type": "string",
       "description": "Unique identifier for tracking the activation"
diff --git a/static/schemas/v1/signals/get-signals-response.json b/static/schemas/v1/signals/get-signals-response.json
index a8863be15c..0c2137e243 100644
--- a/static/schemas/v1/signals/get-signals-response.json
+++ b/static/schemas/v1/signals/get-signals-response.json
@@ -5,14 +5,6 @@
   "description": "Response payload for get_signals task",
   "type": "object",
   "properties": {
-    "message": {
-      "type": "string",
-      "description": "Human-readable summary of signals found"
-    },
-    "context_id": {
-      "type": "string",
-      "description": "Session continuity identifier"
-    },
     "signals": {
       "type": "array",
       "description": "Array of matching signals",