feat(desktop): rebuild agent activity feed around a classifier registry and twelve render classes (#1381)

Signed-off-by: Taylor Ho <taylorkmho@gmail.com>
Co-authored-by: npub1223z34hd7vtwc6qj4s7flsxkj644nlre2nthu7lrrmkumhu3xddsrx9r6w <52a228d6edf316ec6812ac3c9fc0d696ab59fc7954d77e7be31eedcddf91335b@sprout-oss.stage.blox.sqprod.co>
Co-authored-by: npub14vtk7pvazqrq9639qu7e560wnqtl0d53ca4gjuvq6jzf3k2el23qqlwa7f <ab176f059d100602ea25073d9a69ee9817f7b691c76a897180d48498d959faa2@sprout-oss.stage.blox.sqprod.co>

desktop/src/features/agents/ui/agentSessionTranscriptPresentation.test.mjs

@@ -0,0 +1,120 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import {
+  getActivityHeadline,
+  isMeaningfulItem,
+} from "./agentSessionTranscriptPresentation.ts";
+
+const baseTimestamp = "2026-06-14T19:00:00.000Z";
+
+function makeTool(overrides = {}) {
+  return {
+    id: "tool:1",
+    type: "tool",
+    title: "Send Message",
+    toolName: "send_message",
+    buzzToolName: "send_message",
+    status: "executing",
+    args: { channel_id: "abc" },
+    result: "",
+    isError: false,
+    timestamp: baseTimestamp,
+    startedAt: baseTimestamp,
+    completedAt: null,
+    ...overrides,
+  };
+}
+
+function makeMessage(overrides = {}) {
+  return {
+    id: "msg:1",
+    type: "message",
+    role: "assistant",
+    title: "Assistant",
+    text: "Looking into that now.",
+    timestamp: baseTimestamp,
+    ...overrides,
+  };
+}
+
+test("getActivityHeadline formats tool titles and assistant text", () => {
+  assert.equal(getActivityHeadline(makeTool()), "Send Message · abc");
+  assert.equal(
+    getActivityHeadline(makeMessage({ text: "First line\nSecond line" })),
+    "First line",
+  );
+  assert.equal(getActivityHeadline(makeMessage({ text: "   " })), "Responding");
+});
+
+test("isMeaningfulItem ignores lifecycle noise and metadata", () => {
+  assert.equal(
+    isMeaningfulItem({
+      id: "life:1",
+      type: "lifecycle",
+      title: "Turn started",
+      text: "",
+      timestamp: baseTimestamp,
+    }),
+    false,
+  );
+  assert.equal(
+    isMeaningfulItem({
+      id: "meta:1",
+      type: "metadata",
+      title: "Prompt context",
+      sections: [],
+      timestamp: baseTimestamp,
+    }),
+    false,
+  );
+  assert.equal(
+    isMeaningfulItem({
+      id: "life:2",
+      type: "lifecycle",
+      title: "Turn error",
+      text: "boom",
+      timestamp: baseTimestamp,
+    }),
+    true,
+  );
+});
+
+test("getActivityHeadline uses semantic tool descriptors", () => {
+  assert.equal(
+    getActivityHeadline(
+      makeTool({
+        title: "Shell",
+        toolName: "dev__shell",
+        buzzToolName: null,
+        args: { command: "buzz messages send --content hi" },
+        descriptor: {
+          renderClass: "message",
+          label: "Send Message",
+          preview: "hi",
+          source: "shell",
+          groupKey: "buzz-cli:messages.send",
+        },
+      }),
+    ),
+    "Send Message · hi",
+  );
+});
+
+test("isMeaningfulItem ignores suppressed tools", () => {
+  assert.equal(
+    isMeaningfulItem(
+      makeTool({
+        renderClass: "suppressed",
+        descriptor: {
+          renderClass: "suppressed",
+          label: "Checked todos",
+          preview: null,
+          source: "harness",
+          groupKey: "suppressed:stop-hook",
+        },
+      }),
+    ),
+    false,
+  );
+});