Add safe chat reasoning disclosure

src/components/chat/AgentChat.test.tsx

@@ -6,7 +6,7 @@ import {
   AgentPromptInput,
   type AgentChatMessage,
 } from "./AgentChat";
-import { getToolTraceSummary } from "./agentChatModel";
+import { buildReasoningSteps, getToolTraceSummary } from "./agentChatModel";
 
 const assistantMessage: AgentChatMessage = {
   id: "assistant-1",
@@ -111,3 +111,40 @@ describe("AgentChat phase 1 components", () => {
     expect(markup).not.toContain("Werkzeuge verwendet");
   });
 });
+
+describe("AgentChat phase 2 reasoning disclosure", () => {
+  test("builds safe reasoning steps from tool traces without exposing raw inputs", () => {
+    const steps = buildReasoningSteps(assistantMessage.toolTrace);
+
+    expect(steps).toEqual([
+      {
+        label: "summarize_transactions",
+        description: "12 Umsaetze zusammengefasst",
+        status: "complete",
+      },
+      {
+        label: "list_transactions",
+        description: "1 Treffer",
+        status: "complete",
+      },
+    ]);
+    expect(JSON.stringify(steps)).not.toContain("Mai 2026");
+  });
+
+  test("renders an assistant work-progress disclosure from tool traces", () => {
+    const markup = renderToStaticMarkup(<AgentMessage message={assistantMessage} />);
+
+    expect(markup).toContain("So wurde gearbeitet");
+    expect(markup).toContain("summarize_transactions");
+    expect(markup).toContain("12 Umsaetze zusammengefasst");
+  });
+
+  test("marks the current agent step as active while submitting", () => {
+    const markup = renderToStaticMarkup(
+      <AgentConversation messages={[assistantMessage]} isSubmitting />,
+    );
+
+    expect(markup).toContain("Antwort wird vorbereitet");
+    expect(markup).toContain("data-status=\"active\"");
+  });
+});