diff --git a/src/browser/components/tools/BashToolCall.tsx b/src/browser/components/tools/BashToolCall.tsx
index c612783e85..1c1ae41eea 100644
--- a/src/browser/components/tools/BashToolCall.tsx
+++ b/src/browser/components/tools/BashToolCall.tsx
@@ -335,7 +335,11 @@ export const BashToolCall: React.FC<BashToolCallProps> = ({
                       isFilteringLiveOutput && "opacity-60 blur-[1px]"
                     )}
                   >
-                    {combinedLiveOutput.length > 0 ? combinedLiveOutput : "No output yet"}
+                    {combinedLiveOutput.length > 0
+                      ? combinedLiveOutput
+                      : status === "redacted"
+                        ? "Output excluded from shared transcript"
+                        : "No output yet"}
                   </DetailContent>
                   {isFilteringLiveOutput && (
                     <div className="pointer-events-none absolute inset-0 flex items-center justify-center">
diff --git a/src/browser/components/tools/GenericToolCall.tsx b/src/browser/components/tools/GenericToolCall.tsx
index dfe219014c..4af3348ae6 100644
--- a/src/browser/components/tools/GenericToolCall.tsx
+++ b/src/browser/components/tools/GenericToolCall.tsx
@@ -101,6 +101,13 @@ export const GenericToolCall: React.FC<GenericToolCallProps> = ({
               </DetailContent>
             </DetailSection>
           )}
+          {status === "redacted" && (
+            <DetailSection>
+              <DetailContent className="text-muted italic">
+                Output excluded from shared transcript
+              </DetailContent>
+            </DetailSection>
+          )}
         </ToolDetails>
       )}
     </ToolContainer>
diff --git a/src/browser/components/tools/shared/ToolPrimitives.tsx b/src/browser/components/tools/shared/ToolPrimitives.tsx
index 91d73df2ef..6e7da5b74f 100644
--- a/src/browser/components/tools/shared/ToolPrimitives.tsx
+++ b/src/browser/components/tools/shared/ToolPrimitives.tsx
@@ -88,6 +88,8 @@ const getStatusColor = (status: string) => {
       return "text-interrupted";
     case "backgrounded":
       return "text-backgrounded";
+    case "redacted":
+      return "text-foreground-secondary";
     default:
       return "text-foreground-secondary";
   }
diff --git a/src/browser/components/tools/shared/codeExecutionTypes.ts b/src/browser/components/tools/shared/codeExecutionTypes.ts
index e47cc259d6..0d7b6d93a0 100644
--- a/src/browser/components/tools/shared/codeExecutionTypes.ts
+++ b/src/browser/components/tools/shared/codeExecutionTypes.ts
@@ -37,6 +37,6 @@ export interface NestedToolCall {
   toolName: string;
   input: unknown;
   output?: unknown;
-  state: "input-available" | "output-available";
+  state: "input-available" | "output-available" | "output-redacted";
   timestamp?: number;
 }
diff --git a/src/browser/components/tools/shared/toolUtils.tsx b/src/browser/components/tools/shared/toolUtils.tsx
index 07bb089361..16c19ce803 100644
--- a/src/browser/components/tools/shared/toolUtils.tsx
+++ b/src/browser/components/tools/shared/toolUtils.tsx
@@ -1,5 +1,5 @@
 import React, { useState } from "react";
-import { AlertTriangle, Check, CircleDot, X } from "lucide-react";
+import { AlertTriangle, Check, CircleDot, EyeOff, X } from "lucide-react";
 import type { ToolErrorResult } from "@/common/types/tools";
 import { LoadingDots } from "./ToolPrimitives";
 
@@ -13,7 +13,8 @@ export type ToolStatus =
   | "completed"
   | "failed"
   | "interrupted"
-  | "backgrounded";
+  | "backgrounded"
+  | "redacted";
 
 /**
  * Hook for managing tool expansion state
@@ -63,6 +64,13 @@ export function getStatusDisplay(status: ToolStatus): React.ReactNode {
           <span className="status-text">backgrounded</span>
         </>
       );
+    case "redacted":
+      return (
+        <>
+          <EyeOff aria-hidden="true" className="mr-1 inline-block h-3 w-3 align-[-2px]" />
+          <span className="status-text">redacted</span>
+        </>
+      );
     default:
       return <span className="status-text">pending</span>;
   }
@@ -123,12 +131,13 @@ export function isFailedToolOutput(output: unknown): boolean {
  * - input-available + running → "executing"
  */
 export function getNestedToolStatus(
-  state: "input-available" | "output-available",
+  state: "input-available" | "output-available" | "output-redacted",
   output: unknown,
   parentInterrupted: boolean
 ): ToolStatus {
   if (state === "output-available") {
     return isFailedToolOutput(output) ? "failed" : "completed";
   }
+  if (state === "output-redacted") return "redacted";
   return parentInterrupted ? "interrupted" : "executing";
 }
diff --git a/src/browser/utils/messages/StreamingMessageAggregator.ts b/src/browser/utils/messages/StreamingMessageAggregator.ts
index 3451981263..e3f641a8bd 100644
--- a/src/browser/utils/messages/StreamingMessageAggregator.ts
+++ b/src/browser/utils/messages/StreamingMessageAggregator.ts
@@ -2082,10 +2082,12 @@ export class StreamingMessageAggregator {
           });
         } else if (isDynamicToolPart(part)) {
           // Determine status based on part state and result
-          let status: "pending" | "executing" | "completed" | "failed" | "interrupted";
+          let status: "pending" | "executing" | "completed" | "failed" | "interrupted" | "redacted";
           if (part.state === "output-available") {
             // Check if result indicates failure (for tools that return { success: boolean })
             status = hasFailureResult(part.output) ? "failed" : "completed";
+          } else if (part.state === "output-redacted") {
+            status = "redacted";
           } else if (part.state === "input-available") {
             // Most unfinished tool calls in partial messages represent an interruption.
             // ask_user_question is different: it's intentionally waiting on user input,
diff --git a/src/common/orpc/schemas.ts b/src/common/orpc/schemas.ts
index 376ffcb48b..7cc5c3f3cf 100644
--- a/src/common/orpc/schemas.ts
+++ b/src/common/orpc/schemas.ts
@@ -118,6 +118,7 @@ export {
   BranchListResultSchema,
   DynamicToolPartAvailableSchema,
   DynamicToolPartPendingSchema,
+  DynamicToolPartRedactedSchema,
   DynamicToolPartSchema,
   FilePartSchema,
   MuxFilePartSchema,
diff --git a/src/common/orpc/schemas/message.ts b/src/common/orpc/schemas/message.ts
index 0cbd61550a..f1ee389e50 100644
--- a/src/common/orpc/schemas/message.ts
+++ b/src/common/orpc/schemas/message.ts
@@ -45,7 +45,7 @@ export const NestedToolCallSchema = z.object({
   toolName: z.string(),
   input: z.unknown(),
   output: z.unknown().optional(),
-  state: z.enum(["input-available", "output-available"]),
+  state: z.enum(["input-available", "output-available", "output-redacted"]),
   timestamp: z.number().optional(),
 });
 
@@ -62,10 +62,15 @@ export const DynamicToolPartAvailableSchema = MuxToolPartBase.extend({
   output: z.unknown(),
   nestedCalls: z.array(NestedToolCallSchema).optional(),
 });
+export const DynamicToolPartRedactedSchema = MuxToolPartBase.extend({
+  state: z.literal("output-redacted"),
+  nestedCalls: z.array(NestedToolCallSchema).optional(),
+});
 
 export const DynamicToolPartSchema = z.discriminatedUnion("state", [
   DynamicToolPartAvailableSchema,
   DynamicToolPartPendingSchema,
+  DynamicToolPartRedactedSchema,
 ]);
 
 // Alias for message schemas
diff --git a/src/common/types/message.ts b/src/common/types/message.ts
index 5e42de10c0..fbf45fd785 100644
--- a/src/common/types/message.ts
+++ b/src/common/types/message.ts
@@ -521,7 +521,7 @@ export type DisplayedMessage =
       toolName: string;
       args: unknown;
       result?: unknown;
-      status: "pending" | "executing" | "completed" | "failed" | "interrupted";
+      status: "pending" | "executing" | "completed" | "failed" | "interrupted" | "redacted";
       isPartial: boolean; // Whether the parent message was interrupted
       historySequence: number; // Global ordering across all messages
       streamSequence?: number; // Local ordering within this assistant message
@@ -533,7 +533,7 @@ export type DisplayedMessage =
         toolName: string;
         input: unknown;
         output?: unknown;
-        state: "input-available" | "output-available";
+        state: "input-available" | "output-available" | "output-redacted";
         timestamp?: number;
       }>;
     }
diff --git a/src/common/types/toolParts.ts b/src/common/types/toolParts.ts
index 1ab591105a..287e432266 100644
--- a/src/common/types/toolParts.ts
+++ b/src/common/types/toolParts.ts
@@ -6,11 +6,13 @@ import type { z } from "zod";
 import type {
   DynamicToolPartAvailableSchema,
   DynamicToolPartPendingSchema,
+  DynamicToolPartRedactedSchema,
   DynamicToolPartSchema,
 } from "../orpc/schemas";
 
 export type DynamicToolPartAvailable = z.infer<typeof DynamicToolPartAvailableSchema>;
 export type DynamicToolPartPending = z.infer<typeof DynamicToolPartPendingSchema>;
+export type DynamicToolPartRedacted = z.infer<typeof DynamicToolPartRedactedSchema>;
 export type DynamicToolPart = z.infer<typeof DynamicToolPartSchema>;
 
 export function isDynamicToolPart(part: unknown): part is DynamicToolPart {
diff --git a/src/common/utils/messages/transcriptShare.test.ts b/src/common/utils/messages/transcriptShare.test.ts
index 136bf3f6aa..f8db27807a 100644
--- a/src/common/utils/messages/transcriptShare.test.ts
+++ b/src/common/utils/messages/transcriptShare.test.ts
@@ -7,7 +7,7 @@ function splitJsonlLines(jsonl: string): string[] {
 }
 
 describe("buildChatJsonlForSharing", () => {
-  it("strips tool output and sets state back to input-available when includeToolOutput=false", () => {
+  it("strips tool output and sets state to output-redacted when includeToolOutput=false", () => {
     const messages: MuxMessage[] = [
       {
         id: "assistant-1",
@@ -36,7 +36,7 @@ describe("buildChatJsonlForSharing", () => {
       throw new Error("Expected tool part");
     }
 
-    expect(part.state).toBe("input-available");
+    expect(part.state).toBe("output-redacted");
     expect(part).not.toHaveProperty("output");
 
     // Original messages should be unchanged (no mutation during stripping)
@@ -48,7 +48,7 @@ describe("buildChatJsonlForSharing", () => {
     expect(originalPart).toHaveProperty("output");
   });
 
-  it("strips nestedCalls output and sets nestedCalls state back to input-available when includeToolOutput=false", () => {
+  it("strips nestedCalls output and sets nestedCalls state to output-redacted when includeToolOutput=false", () => {
     const messages: MuxMessage[] = [
       {
         id: "assistant-1",
@@ -83,7 +83,7 @@ describe("buildChatJsonlForSharing", () => {
     }
 
     expect(part.state).toBe("input-available");
-    expect(part.nestedCalls?.[0].state).toBe("input-available");
+    expect(part.nestedCalls?.[0].state).toBe("output-redacted");
     expect(part.nestedCalls?.[0]).not.toHaveProperty("output");
 
     // Original nested call should still include output
@@ -370,7 +370,7 @@ describe("buildChatJsonlForSharing", () => {
       throw new Error("Expected tool part");
     }
 
-    expect(strippedPart.state).toBe("input-available");
+    expect(strippedPart.state).toBe("output-redacted");
     expect(strippedPart).not.toHaveProperty("output");
 
     // Original messages should be unchanged (no mutation during injection/stripping)
@@ -394,6 +394,67 @@ describe("buildChatJsonlForSharing", () => {
     expect(originalStrippedPart.state).toBe("output-available");
     expect(originalStrippedPart).toHaveProperty("output");
   });
+  it("preserves task tool outputs while stripping other tool outputs when includeToolOutput=false", () => {
+    const messages: MuxMessage[] = [
+      {
+        id: "assistant-1",
+        role: "assistant",
+        parts: [
+          {
+            type: "dynamic-tool",
+            toolCallId: "tc-task",
+            toolName: "task",
+            state: "output-available",
+            input: { prompt: "Fix the bug", title: "Bug fix" },
+            output: {
+              status: "completed",
+              taskId: "task-123",
+              reportMarkdown: "## Report\n\nFixed the bug in foo.ts",
+            },
+          },
+          {
+            type: "dynamic-tool",
+            toolCallId: "tc-bash",
+            toolName: "bash",
+            state: "output-available",
+            input: { script: "echo hi" },
+            output: { success: true, output: "hi" },
+          },
+        ],
+      },
+    ];
+
+    const jsonl = buildChatJsonlForSharing(messages, {
+      includeToolOutput: false,
+    });
+
+    const parsed = JSON.parse(splitJsonlLines(jsonl)[0]) as MuxMessage;
+
+    // task output should be preserved
+    const taskPart = parsed.parts[0];
+    if (taskPart.type !== "dynamic-tool" || taskPart.state !== "output-available") {
+      throw new Error("Expected completed task tool part");
+    }
+
+    const taskOutput = taskPart.output;
+    if (taskOutput === null || typeof taskOutput !== "object") {
+      throw new Error("Expected task output object");
+    }
+
+    expect((taskOutput as Record<string, unknown>).reportMarkdown).toBe(
+      "## Report\n\nFixed the bug in foo.ts"
+    );
+
+    // bash output should be stripped
+    const strippedPart = parsed.parts[1];
+    if (strippedPart.type !== "dynamic-tool") {
+      throw new Error("Expected tool part");
+    }
+
+    expect(strippedPart.state).toBe("output-redacted");
+    expect(strippedPart).not.toHaveProperty("output");
+  });
+
   it("does not overwrite propose_plan planContent when already present", () => {
     const messages: MuxMessage[] = [
       {
diff --git a/src/common/utils/messages/transcriptShare.ts b/src/common/utils/messages/transcriptShare.ts
index a3e6ab95d3..793ea8270d 100644
--- a/src/common/utils/messages/transcriptShare.ts
+++ b/src/common/utils/messages/transcriptShare.ts
@@ -108,16 +108,25 @@ function stripNestedToolCallOutput(call: NestedToolCall): NestedToolCall {
   const { output: _output, ...rest } = call;
   return {
     ...rest,
-    state: "input-available",
+    state: "output-redacted",
   };
 }
 
+// Tools whose output is preserved even when stripping — their output IS the content
+// (plan text, sub-agent reports) and can't be reconstructed from disk.
+const PRESERVE_OUTPUT_TOOLS = new Set([
+  "propose_plan",
+  "task",
+  "task_await",
+  "task_list",
+  "task_terminate",
+  "task_apply_git_patch",
+]);
+
 function stripToolPartOutput(part: MuxToolPart): MuxToolPart {
   const nestedCalls = part.nestedCalls?.map(stripNestedToolCallOutput);
 
-  // Keep propose_plan output even when stripping other tool outputs.
-  // Shared transcripts need the plan content to be portable (mux-md can't read plan files from disk).
-  if (part.toolName === "propose_plan") {
+  if (PRESERVE_OUTPUT_TOOLS.has(part.toolName)) {
     return nestedCalls ? { ...part, nestedCalls } : part;
   }
 
@@ -128,7 +137,7 @@ function stripToolPartOutput(part: MuxToolPart): MuxToolPart {
   const { output: _output, ...rest } = part;
   return {
     ...rest,
-    state: "input-available",
+    state: "output-redacted",
     nestedCalls,
   };
 }