diff --git a/src/app/shared/task-execution-viewer/execution-viewer.utils.spec.ts b/src/app/shared/task-execution-viewer/execution-viewer.utils.spec.ts
index f14a495..fbff9f0 100644
--- a/src/app/shared/task-execution-viewer/execution-viewer.utils.spec.ts
+++ b/src/app/shared/task-execution-viewer/execution-viewer.utils.spec.ts
@@ -6,6 +6,7 @@ import { TaskExecution, TaskExecutionStep } from '@models/task-execution';
 import {
   asJsonTree,
   buildAuthorizationGate,
+  copyableText,
   buildVisibleExecutionLogs,
   executionEventTitle,
   isScrolledToEnd,
@@ -475,3 +476,11 @@ describe('asJsonTree', () => {
     expect(jsonPreviewIsPartial([1, 2, 3, 4, 5, 6])).toBe(true);
   });
 });
+
+describe('copyableText', () => {
+  it('copies JSON indented, however it arrived, and text as it is', () => {
+    expect(copyableText(asJsonTree('```json\n{"a":[1,2]}\n```'), 'ignored')).toBe('{\n  "a": [\n    1,\n    2\n  ]\n}');
+    expect(copyableText(null, 'Where every rhythm finds its perfect harmony'))
+      .toBe('Where every rhythm finds its perfect harmony');
+  });
+});
diff --git a/src/app/shared/task-execution-viewer/execution-viewer.utils.ts b/src/app/shared/task-execution-viewer/execution-viewer.utils.ts
index 797edef..999e3c5 100644
--- a/src/app/shared/task-execution-viewer/execution-viewer.utils.ts
+++ b/src/app/shared/task-execution-viewer/execution-viewer.utils.ts
@@ -114,6 +114,19 @@ export function jsonPreviewIsPartial(tree: unknown): boolean {
     || children.some((child) => child !== null && typeof child === 'object');
 }
 
+/**
+ * A value as it goes to the clipboard. JSON is indented, so what a model wrote on one line - or
+ * inside a ```json fence - pastes as clean JSON; anything else is copied as shown.
+ */
+export function copyableText(json: unknown | null, text: string): string {
+  if (json == null) return text;
+  try {
+    return JSON.stringify(json, null, 2);
+  } catch {
+    return text;
+  }
+}
+
 export function stringifyOutputValue(value: unknown): string {
   if (value == null) return '';
   if (typeof value === 'string') return value;
diff --git a/src/app/shared/task-execution-viewer/task-execution-viewer.css b/src/app/shared/task-execution-viewer/task-execution-viewer.css
index df24a5d..c32ba72 100644
--- a/src/app/shared/task-execution-viewer/task-execution-viewer.css
+++ b/src/app/shared/task-execution-viewer/task-execution-viewer.css
@@ -976,3 +976,32 @@
 .execution-json-modal {
   height: 90vh;
 }
+
+/* Stays in the corner while a long payload scrolls under it. */
+.execution-outcome-copy {
+  position: sticky;
+  top: 0;
+  float: right;
+  z-index: 1;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 28px;
+  height: 28px;
+  margin-left: 6px;
+  border: 1px solid #d1fae5;
+  border-radius: 6px;
+  background: #fff;
+  color: #475569;
+  cursor: pointer;
+}
+
+.execution-outcome-copy:hover {
+  background: #f0fdf4;
+}
+
+.execution-outcome-copy .mat-icon {
+  width: 16px;
+  height: 16px;
+  font-size: 16px;
+}
diff --git a/src/app/shared/task-execution-viewer/task-execution-viewer.html b/src/app/shared/task-execution-viewer/task-execution-viewer.html
index c1bf5b1..aa39dd8 100644
--- a/src/app/shared/task-execution-viewer/task-execution-viewer.html
+++ b/src/app/shared/task-execution-viewer/task-execution-viewer.html
@@ -161,6 +161,14 @@
 
         @if (outcome.payload !== null && outcome.payload !== undefined) {
         <div class="execution-outcome-payload">
+          <button
+            type="button"
+            class="execution-outcome-copy"
+            [matTooltip]="copiedValueKey() === 'outcome:' + outcome.stepId ? 'Copied' : 'Copy the outcome'"
+            aria-label="Copy the outcome"
+            (click)="copyValue('outcome:' + outcome.stepId, payloadJson(outcome.payload) ?? (isTextPayload(outcome.payload) ? null : outcome.payload), isTextPayload(outcome.payload) ? outcome.payload : '', $event)">
+            <mat-icon [fontIcon]="copiedValueKey() === 'outcome:' + outcome.stepId ? 'check' : 'content_copy'"></mat-icon>
+          </button>
           @if (payloadJson(outcome.payload); as tree) {
           <app-json-viewer [value]="tree" [initiallyExpanded]="true" />
           } @else if (isTextPayload(outcome.payload)) {
@@ -660,7 +668,17 @@
           <h3 class="text-lg font-semibold text-slate-900">{{ outputPreviewTitle(outputModal) }}</h3>
           <p class="mt-1 break-all text-xs text-slate-500">{{ outputPreviewSubtitle(outputModal) }}</p>
         </div>
-        <button type="button" mat-stroked-button (click)="closeOutputPreview($event)">Close</button>
+        <div class="flex shrink-0 items-center gap-2">
+          <button
+            type="button"
+            mat-stroked-button
+            [attr.aria-label]="outputModal.json ? 'Copy the JSON' : 'Copy the text'"
+            (click)="copyValue(outputModal.key, outputModal.json, outputModal.value, $event)">
+            <mat-icon [fontIcon]="copiedValueKey() === outputModal.key ? 'check' : 'content_copy'"></mat-icon>
+            <span>{{ copiedValueKey() === outputModal.key ? 'Copied' : (outputModal.json ? 'Copy JSON' : 'Copy') }}</span>
+          </button>
+          <button type="button" mat-stroked-button (click)="closeOutputPreview($event)">Close</button>
+        </div>
       </div>
       <div class="min-h-0 flex-1 overflow-auto px-5 py-4">
         @if (outputModal.json) {
@@ -682,7 +700,17 @@
           <h3 class="text-lg font-semibold text-slate-900">{{ intermediateInputPreviewTitle(inputModal) }}</h3>
           <p class="mt-1 break-all text-xs text-slate-500">{{ intermediateInputPreviewSubtitle(inputModal) }}</p>
         </div>
-        <button type="button" mat-stroked-button (click)="closeIntermediateInputPreview($event)">Close</button>
+        <div class="flex shrink-0 items-center gap-2">
+          <button
+            type="button"
+            mat-stroked-button
+            [attr.aria-label]="inputModal.json ? 'Copy the JSON' : 'Copy the text'"
+            (click)="copyValue(inputModal.key, inputModal.json, inputModal.value, $event)">
+            <mat-icon [fontIcon]="copiedValueKey() === inputModal.key ? 'check' : 'content_copy'"></mat-icon>
+            <span>{{ copiedValueKey() === inputModal.key ? 'Copied' : (inputModal.json ? 'Copy JSON' : 'Copy') }}</span>
+          </button>
+          <button type="button" mat-stroked-button (click)="closeIntermediateInputPreview($event)">Close</button>
+        </div>
       </div>
       <div class="min-h-0 flex-1 overflow-auto px-5 py-4">
         @if (inputModal.json) {
diff --git a/src/app/shared/task-execution-viewer/task-execution-viewer.ts b/src/app/shared/task-execution-viewer/task-execution-viewer.ts
index 4be8e6b..5fa6555 100644
--- a/src/app/shared/task-execution-viewer/task-execution-viewer.ts
+++ b/src/app/shared/task-execution-viewer/task-execution-viewer.ts
@@ -109,6 +109,7 @@ import {
   buildAuthorizationGate,
   isExecutionStartable,
   asJsonTree,
+  copyableText,
   JSON_PREVIEW_ENTRIES
 } from './execution-viewer.utils';
 import { buildExecutionLoopHistories, ExecutionLoopHistory } from './execution-rounds';
@@ -702,6 +703,24 @@ export class TaskExecutionViewerComponent implements OnDestroy {
 
   readonly jsonPreviewEntries = JSON_PREVIEW_ENTRIES;
 
+  /** What was last copied, for its button to say so for a moment. */
+  readonly copiedValueKey = signal<string | null>(null);
+  private copiedValueReset: ReturnType<typeof setTimeout> | null = null;
+
+  /** Copies a value to paste elsewhere: JSON indented, whatever form it arrived in; text as it is. */
+  async copyValue(key: string, json: unknown | null, text: string, event?: Event) {
+    event?.preventDefault();
+    event?.stopPropagation();
+    try {
+      await navigator.clipboard.writeText(copyableText(json, text));
+      this.copiedValueKey.set(key);
+      if (this.copiedValueReset) clearTimeout(this.copiedValueReset);
+      this.copiedValueReset = setTimeout(() => this.copiedValueKey.set(null), 2000);
+    } catch {
+      // Clipboard access can be refused; the value is still there to select by hand.
+    }
+  }
+
   stepNameForOutcome(stepId: string): string {
     return this.execution()?.context.steps?.[stepId]?.node?.name ?? stepId;
   }