angular · dgp1130 · Oct 1, 2026 · Oct 1, 2026
diff --git a/packages/core/src/webmcp/types.ts b/packages/core/src/webmcp/types.ts
@@ -81,6 +81,12 @@ export interface Annotations {
    * with the external world.
    */
   consequentialHint?: boolean;
+
+  /**
+   * Whether the tool is intended for debugging and development purposes rather than end-user
+   * agent interaction.
+   */
+  debugging?: boolean;
 }
 
 /**

diff --git a/packages/core/test/webmcp/declare_tool_spec.ts b/packages/core/test/webmcp/declare_tool_spec.ts
@@ -80,6 +80,7 @@ describe('declareExperimentalWebMcpTool', () => {
           readOnlyHint: true,
           untrustedContentHint: true,
           consequentialHint: true,
+          debugging: true,
         },
       },
       Injector.create({providers: []}),
@@ -91,6 +92,7 @@ describe('declareExperimentalWebMcpTool', () => {
           readOnlyHint: true,
           untrustedContentHint: true,
           consequentialHint: true,
+          debugging: true,
         },
       }),
       jasmine.anything(),

diff --git a/packages/forms/signals/src/api/structure.ts b/packages/forms/signals/src/api/structure.ts
@@ -74,8 +74,8 @@ export interface FormOptions<TModel> {
      * Set of configuration values extending the core tool behavior.
      */
     annotations?: {
-      // `readOnlyHint` and `untrustedContentHint` are intentionally omitted as they have
-      // hard-coded values.
+      // `readOnlyHint`, `untrustedContentHint`, and `debugging` are intentionally omitted as they
+      // have hard-coded values.
 
       /**
        * A hint that the tool will have consequential effects like mutating state or interacting

diff --git a/packages/forms/signals/src/webmcp/registration.ts b/packages/forms/signals/src/webmcp/registration.ts
@@ -65,6 +65,9 @@ async function initWebMcpForm(
         // Response text is currently hard-coded by the framework and trusted or derived from application
         // errors which are considered trusted.
         untrustedContentHint: false,
+
+        // Forms are end-user UI elements, not developer-facing debugging tools.
+        debugging: false,
       },
       execute: async (args: Record<string, unknown> | unknown[]) => {
         // Populate the form with changes from the agent.

diff --git a/packages/forms/signals/test/web/webmcp.spec.ts b/packages/forms/signals/test/web/webmcp.spec.ts
@@ -64,6 +64,7 @@ describe('Signal Forms WebMCP Integration', () => {
           annotations: {
             readOnlyHint: false,
             untrustedContentHint: false,
+            debugging: false,
           },
         }),
         jasmine.anything(),