diff --git a/src/features/chat/domain/message-stream/semantics/index.ts b/src/features/chat/domain/message-stream/semantics/index.ts
index cd884ccd..f14097cd 100644
--- a/src/features/chat/domain/message-stream/semantics/index.ts
+++ b/src/features/chat/domain/message-stream/semantics/index.ts
@@ -1,21 +1,12 @@
 export { messageStreamSemanticClassifications } from "./classify";
 export {
-  messageStreamIsApprovalResult,
-  messageStreamIsAssistantResponse,
-  messageStreamIsCommandEvidence,
-  messageStreamIsContextCompaction,
   messageStreamIsCoordinationProgress,
-  messageStreamIsGoalChange,
-  messageStreamIsHookEvidence,
   messageStreamIsPermissionDecision,
-  messageStreamIsProposedPlan,
   messageStreamIsReasoningProgress,
   messageStreamIsReviewResult,
   messageStreamIsTaskProgress,
-  messageStreamIsToolEvidence,
   messageStreamIsTurnInitiator,
   messageStreamIsTurnSteer,
-  messageStreamIsUserInputResult,
   messageStreamIsWorkspaceResult,
   messageStreamRenderFamily,
 } from "./predicates";
diff --git a/src/features/chat/domain/message-stream/semantics/predicates.ts b/src/features/chat/domain/message-stream/semantics/predicates.ts
index 5f9d90f2..c25057ce 100644
--- a/src/features/chat/domain/message-stream/semantics/predicates.ts
+++ b/src/features/chat/domain/message-stream/semantics/predicates.ts
@@ -27,14 +27,6 @@ export function messageStreamIsTurnSteer(classification: MessageStreamSemanticCl
   );
 }
 
-export function messageStreamIsProposedPlan(classification: MessageStreamSemanticClassification): boolean {
-  return messageStreamHasMeaning(classification, "dialogue", "proposal");
-}
-
-export function messageStreamIsAssistantResponse(classification: MessageStreamSemanticClassification): boolean {
-  return messageStreamHasMeaning(classification, "dialogue", "response");
-}
-
 export function messageStreamIsWorkspaceResult(classification: MessageStreamSemanticClassification): boolean {
   return messageStreamHasMeaning(classification, "workspace", "result");
 }
@@ -51,60 +43,29 @@ export function messageStreamIsReasoningProgress(classification: MessageStreamSe
   return classification.item.kind === "reasoning";
 }
 
-export function messageStreamIsContextCompaction(classification: MessageStreamSemanticClassification): boolean {
-  return classification.item.kind === "contextCompaction";
-}
-
-export function messageStreamIsCommandEvidence(classification: MessageStreamSemanticClassification): boolean {
-  return classification.item.kind === "command";
-}
-
-export function messageStreamIsToolEvidence(classification: MessageStreamSemanticClassification): boolean {
-  return classification.item.kind === "tool";
-}
-
-export function messageStreamIsHookEvidence(classification: MessageStreamSemanticClassification): boolean {
-  return classification.item.kind === "hook";
-}
-
-export function messageStreamIsApprovalResult(classification: MessageStreamSemanticClassification): boolean {
-  return classification.item.kind === "approvalResult";
-}
-
-export function messageStreamIsUserInputResult(classification: MessageStreamSemanticClassification): boolean {
-  return classification.item.kind === "userInputResult";
-}
-
 export function messageStreamIsReviewResult(classification: MessageStreamSemanticClassification): boolean {
   return classification.item.kind === "reviewResult";
 }
 
-export function messageStreamIsGoalChange(classification: MessageStreamSemanticClassification): boolean {
-  return classification.item.kind === "goal";
-}
-
 export function messageStreamRenderFamily(classification: MessageStreamSemanticClassification): MessageStreamRenderFamily | null {
-  if (classification.item.kind === "message" || classification.item.kind === "system" || messageStreamIsUserInputResult(classification)) {
-    return "text";
-  }
-  if (
-    messageStreamIsCommandEvidence(classification) ||
-    messageStreamIsWorkspaceResult(classification) ||
-    messageStreamIsToolEvidence(classification) ||
-    messageStreamIsHookEvidence(classification) ||
-    messageStreamIsGoalChange(classification) ||
-    messageStreamIsApprovalResult(classification) ||
-    messageStreamIsReviewResult(classification)
-  ) {
-    return "toolResult";
-  }
-  if (
-    messageStreamIsTaskProgress(classification) ||
-    messageStreamIsCoordinationProgress(classification) ||
-    messageStreamIsReasoningProgress(classification) ||
-    messageStreamIsContextCompaction(classification)
-  ) {
-    return "work";
+  switch (classification.item.kind) {
+    case "message":
+    case "system":
+    case "userInputResult":
+      return "text";
+    case "command":
+    case "fileChange":
+    case "tool":
+    case "hook":
+    case "goal":
+    case "approvalResult":
+    case "reviewResult":
+      return "toolResult";
+    case "taskProgress":
+    case "agent":
+    case "reasoning":
+    case "contextCompaction":
+      return "work";
   }
   return null;
 }
diff --git a/src/features/chat/presentation/message-stream/layout.ts b/src/features/chat/presentation/message-stream/layout.ts
index 75ac04c1..fc57792e 100644
--- a/src/features/chat/presentation/message-stream/layout.ts
+++ b/src/features/chat/presentation/message-stream/layout.ts
@@ -1,22 +1,11 @@
 import type { MessageStreamItem } from "../../domain/message-stream/items";
 import { pathRelativeToRoot } from "../../domain/message-stream/format/path-labels";
 import {
-  messageStreamIsApprovalResult,
-  messageStreamIsAssistantResponse,
-  messageStreamIsCommandEvidence,
-  messageStreamIsContextCompaction,
-  messageStreamIsCoordinationProgress,
-  messageStreamIsGoalChange,
-  messageStreamIsHookEvidence,
   messageStreamIsPermissionDecision,
-  messageStreamIsProposedPlan,
   messageStreamIsReasoningProgress,
   messageStreamIsReviewResult,
-  messageStreamIsTaskProgress,
-  messageStreamIsToolEvidence,
   messageStreamIsTurnInitiator,
   messageStreamIsTurnSteer,
-  messageStreamIsUserInputResult,
   messageStreamIsWorkspaceResult,
   messageStreamSemanticClassifications,
 } from "../../domain/message-stream/semantics";
@@ -103,7 +92,7 @@ export function messageStreamLayoutBlocks(
         type: "activityGroup",
         id: `turn-${turnId}-activity`,
         turnId,
-        summary: turnActivitySummary(groupItems),
+        summary: "Work details",
         items: groupItems,
       });
     }
@@ -218,55 +207,6 @@ function autoReviewSummariesForTurns(items: readonly MessageStreamSemanticClassi
   return byTurn;
 }
 
-function turnActivitySummary(items: readonly GroupedActivity[]): string {
-  const parts = [
-    countActivityLabel(
-      items,
-      (item) => item.type === "item" && messageStreamIsAssistantResponse(item.classification),
-      "response",
-      "responses",
-    ),
-    countActivityLabel(items, (item) => item.type === "item" && messageStreamIsProposedPlan(item.classification), "plan", "plans"),
-    countActivityLabel(items, (item) => item.type === "steering", "steer", "steers"),
-    countActivityLabel(items, (item) => item.type === "item" && messageStreamIsTaskProgress(item.classification), "task progress"),
-    countActivityLabel(items, (item) => item.type === "item" && messageStreamIsCoordinationProgress(item.classification), "agent"),
-    countActivityLabel(items, (item) => item.type === "item" && messageStreamIsCommandEvidence(item.classification), "command"),
-    countActivityLabel(items, (item) => item.type === "item" && messageStreamIsWorkspaceResult(item.classification), "file change"),
-    countActivityLabel(items, (item) => item.type === "item" && messageStreamIsToolEvidence(item.classification), "tool"),
-    countActivityLabel(items, (item) => item.type === "item" && messageStreamIsHookEvidence(item.classification), "hook"),
-    countActivityLabel(
-      items,
-      (item) => item.type === "item" && messageStreamIsReasoningProgress(item.classification),
-      "thought",
-      "thought notes",
-    ),
-    countActivityLabel(
-      items,
-      (item) => item.type === "item" && messageStreamIsContextCompaction(item.classification),
-      "context compaction",
-    ),
-    countActivityLabel(items, (item) => item.type === "item" && messageStreamIsApprovalResult(item.classification), "approval"),
-    countActivityLabel(items, (item) => item.type === "item" && messageStreamIsUserInputResult(item.classification), "input"),
-    countActivityLabel(items, (item) => item.type === "item" && messageStreamIsReviewResult(item.classification), "review"),
-    countActivityLabel(items, (item) => item.type === "item" && messageStreamIsGoalChange(item.classification), "goal"),
-  ].filter((part): part is string => Boolean(part));
-
-  if (parts.length === 0) return "Work details";
-  return `Work details: ${parts.join(", ")}`;
-}
-
-function countActivityLabel(
-  items: readonly GroupedActivity[],
-  predicate: (item: GroupedActivity) => boolean,
-  label: string,
-  pluralLabel = `${label}s`,
-): string | null {
-  const count = items.filter(predicate).length;
-  if (count === 0) return null;
-  if (count === 1) return label;
-  return `${String(count)} ${pluralLabel}`;
-}
-
 function textForMessageStreamItem(item: MessageStreamItem): string {
   return "text" in item && typeof item.text === "string" ? item.text : "";
 }
diff --git a/tests/features/chat/message-stream/model.test.ts b/tests/features/chat/message-stream/model.test.ts
index 7206b77c..c1920236 100644
--- a/tests/features/chat/message-stream/model.test.ts
+++ b/tests/features/chat/message-stream/model.test.ts
@@ -916,7 +916,7 @@ describe("display block grouping keeps work logs subordinate to conversation mes
 
     const blocks = messageStreamLayoutBlocks(items, null);
     expect(blocks.map((block) => block.type)).toEqual(["item", "activityGroup", "item"]);
-    expect(blocks[1]).toMatchObject({ summary: "Work details: command, thought" });
+    expect(blocks[1]).toMatchObject({ summary: "Work details" });
   });
 
   it("groups completed hook and review logs before the final assistant message", () => {
@@ -950,7 +950,7 @@ describe("display block grouping keeps work logs subordinate to conversation mes
 
     expect(blocks.map((block) => (block.type === "item" ? block.item.id : block.id))).toEqual(["u1", "turn-t1-activity", "a1"]);
     expect(blocks[1]).toMatchObject({
-      summary: "Work details: command, hook, thought, 2 reviews",
+      summary: "Work details",
       items: [
         { item: { id: "hook-1" } },
         { item: { id: "c1" } },
@@ -1021,7 +1021,7 @@ describe("display block grouping keeps work logs subordinate to conversation mes
     const blocks = messageStreamLayoutBlocks(items, null);
     expect(blocks.map((block) => block.type)).toEqual(["item", "activityGroup", "item"]);
     expect(blocks[1]).toMatchObject({
-      summary: "Work details: 2 responses, command, file change",
+      summary: "Work details",
       items: [{ item: { id: "a1" } }, { item: { id: "c1" } }, { item: { id: "a2" } }, { item: { id: "f1" } }],
     });
     expect(blocks[2]).toMatchObject({ item: { id: "a3" } });
@@ -1069,7 +1069,7 @@ describe("display block grouping keeps work logs subordinate to conversation mes
 
     expect(blocks.map((block) => (block.type === "item" ? block.item.id : block.id))).toEqual(["u1", "u2", "turn-t1-activity", "a1"]);
     expect(blocks[2]).toMatchObject({
-      summary: "Work details: steer, 2 commands",
+      summary: "Work details",
       items: [
         { type: "item", item: { id: "c1" } },
         {
@@ -1084,7 +1084,7 @@ describe("display block grouping keeps work logs subordinate to conversation mes
     });
   });
 
-  it("pluralizes multiple steering markers as steers in completed turn work details", () => {
+  it("keeps multiple steering markers in completed turn work details", () => {
     const items: MessageStreamItem[] = [
       { id: "u1", kind: "message", messageKind: "user", role: "user", text: "do it", turnId: "t1" },
       { id: "u2", kind: "message", messageKind: "user", role: "user", text: "also check tests", turnId: "t1" },
@@ -1104,7 +1104,7 @@ describe("display block grouping keeps work logs subordinate to conversation mes
     const activityGroup = blocks.find((block) => block.type === "activityGroup");
 
     expect(activityGroup).toMatchObject({
-      summary: "Work details: 2 steers",
+      summary: "Work details",
       items: [
         { type: "steering", id: "steer-activity-u2" },
         { type: "steering", id: "steer-activity-u3" },
@@ -1158,7 +1158,7 @@ describe("display block grouping keeps work logs subordinate to conversation mes
     expect(blocks.map((block) => (block.type === "item" ? block.item.id : block.id))).toEqual(["u1", "plan-progress-t1", "a1"]);
   });
 
-  it("summarizes task progress and agent activity separately from tools", () => {
+  it("groups task progress and agent activity inside completed turn work details", () => {
     const items: MessageStreamItem[] = [
       { id: "u1", kind: "message", messageKind: "user", role: "user", text: "do it", turnId: "t1" },
       {
@@ -1198,7 +1198,10 @@ describe("display block grouping keeps work logs subordinate to conversation mes
     ];
 
     const blocks = messageStreamLayoutBlocks(items, null);
-    expect(blocks[1]).toMatchObject({ summary: "Work details: task progress, agent" });
+    expect(blocks[1]).toMatchObject({
+      summary: "Work details",
+      items: [{ item: { id: "plan-progress-t1" } }, { item: { id: "agent-1" } }],
+    });
   });
 
   it("summarizes active subagent states while a turn is running", () => {
diff --git a/tests/features/chat/ui/message-stream/blocks-and-messages.test.tsx b/tests/features/chat/ui/message-stream/blocks-and-messages.test.tsx
index 4f33178f..5aba003f 100644
--- a/tests/features/chat/ui/message-stream/blocks-and-messages.test.tsx
+++ b/tests/features/chat/ui/message-stream/blocks-and-messages.test.tsx
@@ -90,7 +90,7 @@ describe("message stream rendering and message actions", () => {
       ),
     ).toEqual(["item:u1", "activity:turn-t1-activity", "item:a1"]);
     const activitySummary = parent.querySelector<HTMLElement>('[data-codex-panel-block-key="activity:turn-t1-activity"] summary');
-    expect(activitySummary?.textContent).toBe("Work details: hook");
+    expect(activitySummary?.textContent).toBe("Work details");
     expect(activitySummary?.tabIndex).toBe(-1);
     unmountUiRootInAct(parent);
   });
diff --git a/tests/features/chat/ui/message-stream/work-log.test.tsx b/tests/features/chat/ui/message-stream/work-log.test.tsx
index 95cfb5be..5d699a0a 100644
--- a/tests/features/chat/ui/message-stream/work-log.test.tsx
+++ b/tests/features/chat/ui/message-stream/work-log.test.tsx
@@ -330,7 +330,7 @@ describe("work log renderer decisions", () => {
     const element = renderMessageBlockElement(expectPresent(blocks.find((block) => block.key === "activity:turn-turn-activity")));
 
     expect(element).toBeDefined();
-    expect(element.querySelector(":scope > summary")?.textContent).toBe("Work details: hook");
+    expect(element.querySelector(":scope > summary")?.textContent).toBe("Work details");
     expect(element.querySelector(".codex-panel__tool-item--hook")?.classList.contains("codex-panel__execution--completed")).toBe(true);
     expect(element.querySelector(".codex-panel__tool-summary")?.textContent).toBe("postToolUse: Formatted 1 file.");
     expect(element.querySelector(".codex-panel__meta-grid")?.textContent).toContain("statuscompleted");