diff --git a/apps/fabro-web/app/components/ui.tsx b/apps/fabro-web/app/components/ui.tsx
index 485941dbf..930ba8f1c 100644
--- a/apps/fabro-web/app/components/ui.tsx
+++ b/apps/fabro-web/app/components/ui.tsx
@@ -2,8 +2,9 @@
 // exposes the primary button, secondary button, input, error message, and
 // copy button so the auth and in-app surfaces can match.
 
-import { useId, useRef, useState } from "react";
+import { useId, useRef, useState, type ReactNode } from "react";
 import { createPortal } from "react-dom";
+import { Dialog, DialogPanel, DialogTitle } from "@headlessui/react";
 import {
   ClipboardDocumentCheckIcon,
   ClipboardIcon,
@@ -16,7 +17,10 @@ export const PRIMARY_BUTTON_CLASS =
   "inline-flex items-center justify-center gap-2 rounded-lg bg-teal-500 px-4 py-2 text-sm font-medium text-on-primary transition-colors hover:bg-teal-300 focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-teal-500 disabled:cursor-not-allowed disabled:opacity-60 disabled:hover:bg-teal-500";
 
 export const SECONDARY_BUTTON_CLASS =
-  "inline-flex items-center justify-center gap-2 rounded-lg bg-transparent px-3.5 py-2 text-sm font-medium text-fg-2 outline-1 -outline-offset-1 outline-white/10 hover:bg-overlay hover:text-fg focus-visible:outline-2 focus-visible:-outline-offset-1 focus-visible:outline-teal-500";
+  "inline-flex items-center justify-center gap-2 rounded-lg bg-transparent px-3.5 py-2 text-sm font-medium text-fg-2 outline-1 -outline-offset-1 outline-white/10 hover:bg-overlay hover:text-fg focus-visible:outline-2 focus-visible:-outline-offset-1 focus-visible:outline-teal-500 disabled:cursor-not-allowed disabled:opacity-60";
+
+export const DANGER_BUTTON_CLASS =
+  "inline-flex items-center justify-center gap-2 rounded-lg bg-coral px-4 py-2 text-sm font-medium text-on-primary transition-colors hover:bg-coral/90 focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-coral disabled:cursor-not-allowed disabled:opacity-60 disabled:hover:bg-coral";
 
 export function ErrorMessage({ message }: { message: string }) {
   return (
@@ -64,6 +68,66 @@ export function CopyButton({
   );
 }
 
+export function ConfirmDialog({
+  open,
+  title,
+  description,
+  confirmLabel,
+  pendingLabel,
+  cancelLabel = "Cancel",
+  pending = false,
+  onConfirm,
+  onCancel,
+}: {
+  open: boolean;
+  title: string;
+  description: ReactNode;
+  confirmLabel: string;
+  pendingLabel?: string;
+  cancelLabel?: string;
+  pending?: boolean;
+  onConfirm: () => void;
+  onCancel: () => void;
+}) {
+  return (
+    <Dialog
+      open={open}
+      onClose={() => {
+        if (!pending) onCancel();
+      }}
+      className="relative z-50"
+    >
+      <div className="fixed inset-0 bg-black/60 backdrop-blur-sm" aria-hidden="true" />
+      <div className="fixed inset-0 flex items-start justify-center pt-[20vh] px-4">
+        <DialogPanel className="w-full max-w-md rounded-lg border border-line-strong bg-panel shadow-2xl shadow-black/40">
+          <div className="px-5 py-4">
+            <DialogTitle className="text-sm font-semibold text-fg">{title}</DialogTitle>
+            <div className="mt-2 text-sm text-fg-3">{description}</div>
+            <div className="mt-5 flex justify-end gap-2">
+              <button
+                type="button"
+                onClick={onCancel}
+                disabled={pending}
+                className={SECONDARY_BUTTON_CLASS}
+              >
+                {cancelLabel}
+              </button>
+              <button
+                type="button"
+                onClick={onConfirm}
+                disabled={pending}
+                className={DANGER_BUTTON_CLASS}
+              >
+                {pending ? (pendingLabel ?? `${confirmLabel}…`) : confirmLabel}
+              </button>
+            </div>
+          </div>
+        </DialogPanel>
+      </div>
+    </Dialog>
+  );
+}
+
 export function Tooltip({
   label,
   children,
diff --git a/apps/fabro-web/app/lib/run-actions.ts b/apps/fabro-web/app/lib/run-actions.ts
index 326fc346f..c2b8a394c 100644
--- a/apps/fabro-web/app/lib/run-actions.ts
+++ b/apps/fabro-web/app/lib/run-actions.ts
@@ -38,6 +38,16 @@ export async function unarchiveRun(id: string, request?: Request): Promise<RunSt
   return runLifecycleAction(id, "unarchive", request);
 }
 
+export async function deleteRun(id: string, request?: Request): Promise<void> {
+  const response = await apiRequest(`/api/v1/runs/${encodeURIComponent(id)}`, {
+    init: { method: "DELETE" },
+    request,
+  });
+
+  if (response.status === 204 || response.status === 404) return;
+  throw await parseLifecycleActionError(response);
+}
+
 export function canCancel(status: string | null | undefined): boolean {
   return !!status && CANCELABLE_STATUSES.has(status as RunStatus);
 }
@@ -50,10 +60,25 @@ export function canUnarchive(status: string | null | undefined): boolean {
   return status === "archived";
 }
 
+export function canDelete(status: string | null | undefined): boolean {
+  return status === "archived";
+}
+
 export function isTerminalCancelledRun(run: RunStatusResponse): boolean {
   return run.status.kind === "failed" && run.status.reason === "cancelled";
 }
 
+export function deleteErrorMessage(error: unknown): string {
+  if (isLifecycleActionError(error)) {
+    if (error.status === 409) {
+      return "Active runs can't be deleted.";
+    }
+    const detail = error.errors[0]?.detail?.trim();
+    if (detail) return detail;
+  }
+  return "Couldn't delete the run right now. Try again.";
+}
+
 export function mapError(error: unknown, action: LifecycleAction): string {
   if (isLifecycleActionError(error)) {
     if (error.status === 404) {
diff --git a/apps/fabro-web/app/routes/run-detail.tsx b/apps/fabro-web/app/routes/run-detail.tsx
index 55bcc6031..85b81b759 100644
--- a/apps/fabro-web/app/routes/run-detail.tsx
+++ b/apps/fabro-web/app/routes/run-detail.tsx
@@ -13,14 +13,14 @@ import {
   RectangleStackIcon,
   SignalIcon,
 } from "@heroicons/react/20/solid";
-import { Link, Outlet, useLocation, useMatches } from "react-router";
+import { Link, Outlet, useLocation, useMatches, useNavigate } from "react-router";
 import { Menu, MenuButton, MenuItem, MenuItems } from "@headlessui/react";
 
 import { InterviewDock } from "../components/interview-dock";
 import { SteerBar, type SteerBarHandle } from "../components/steer-bar";
 import { ErrorState } from "../components/state";
 import { useToast } from "../components/toast";
-import { SECONDARY_BUTTON_CLASS, Tooltip } from "../components/ui";
+import { ConfirmDialog, SECONDARY_BUTTON_CLASS, Tooltip } from "../components/ui";
 import {
   isRunStatus,
   mapRunSummaryToRunItem,
@@ -28,6 +28,7 @@ import {
   type RunSummary,
 } from "../data/runs";
 import { useDemoMode } from "../lib/demo-mode";
+import { useSWRConfig } from "swr";
 import {
   useArchiveRun,
   useCancelRun,
@@ -38,13 +39,17 @@ import {
   type PreviewMutationResult,
 } from "../lib/mutations";
 import { formatAbsoluteTs, formatRelativeTime } from "../lib/format";
+import { queryKeys } from "../lib/query-keys";
 import { useRunEvents } from "../lib/run-events";
 import { useRunToasts } from "../hooks/use-run-toasts";
 import { useRun, useRunQuestions } from "../lib/queries";
 import {
   canArchive,
   canCancel,
+  canDelete,
   canUnarchive,
+  deleteErrorMessage,
+  deleteRun,
   isTerminalCancelledRun,
   mapError,
   type LifecycleAction,
@@ -107,6 +112,7 @@ export function lifecycleActionVisibility(status: string | null | undefined) {
     showPrimaryCancel: canCancel(status),
     showArchive: canArchive(status),
     showUnarchive: canUnarchive(status),
+    showDelete: canDelete(status),
   };
 }
 
@@ -147,6 +153,10 @@ export default function RunDetail({ params }: { params: { id: string } }) {
   const archiveMutation = useArchiveRun(params.id);
   const unarchiveMutation = useUnarchiveRun(params.id);
   const interruptMutation = useInterruptRun(params.id);
+  const navigate = useNavigate();
+  const { mutate } = useSWRConfig();
+  const [deleteDialogOpen, setDeleteDialogOpen] = useState(false);
+  const [deletePending, setDeletePending] = useState(false);
   const { push, dismiss } = useToast();
   const filesCount = runQuery.data?.diff_summary?.files_changed ?? null;
   const tabs = allTabs
@@ -217,6 +227,21 @@ export default function RunDetail({ params }: { params: { id: string } }) {
   const cancelPending = cancelMutation.isMutating;
   const archivePending = archiveMutation.isMutating;
   const unarchivePending = unarchiveMutation.isMutating;
+  const handleConfirmDelete = async () => {
+    setDeletePending(true);
+    try {
+      await deleteRun(params.id);
+      void mutate(queryKeys.boards.runs());
+      void mutate(queryKeys.boards.runs(true));
+      push({ message: "Run deleted." });
+      navigate("/runs");
+    } catch (error) {
+      push({ message: deleteErrorMessage(error), tone: "error" });
+    } finally {
+      setDeletePending(false);
+      setDeleteDialogOpen(false);
+    }
+  };
   const hasPendingQuestions = isBlocked && pendingQuestions.length > 0;
   const dockClearance = hasPendingQuestions ? "18rem" : "5rem";
   const rootStyle = {
@@ -304,12 +329,31 @@ export default function RunDetail({ params }: { params: { id: string } }) {
           canUnarchive={visibility.showUnarchive}
           unarchivePending={unarchivePending}
           onUnarchive={() => void unarchiveMutation.trigger()}
+          canDelete={visibility.showDelete}
+          deletePending={deletePending}
+          onDelete={() => setDeleteDialogOpen(true)}
           canCancel={visibility.showPrimaryCancel}
           cancelPending={cancelPending}
           onCancel={() => void cancelMutation.trigger()}
         />
       </div>
 
+      <ConfirmDialog
+        open={deleteDialogOpen}
+        title="Delete this run?"
+        description={
+          <>
+            This permanently removes <span className="font-mono text-fg-2">{run.title}</span> and its
+            durable state. This action cannot be undone.
+          </>
+        }
+        confirmLabel="Delete run"
+        pendingLabel="Deleting…"
+        pending={deletePending}
+        onConfirm={() => void handleConfirmDelete()}
+        onCancel={() => setDeleteDialogOpen(false)}
+      />
+
       <div
         className={classNames(
           "relative before:pointer-events-none before:absolute before:bottom-0 before:left-1/2 before:h-px before:w-screen before:-translate-x-1/2 before:bg-line",
@@ -456,6 +500,9 @@ interface ActionsMenuProps {
   canUnarchive: boolean;
   unarchivePending: boolean;
   onUnarchive: () => void;
+  canDelete: boolean;
+  deletePending: boolean;
+  onDelete: () => void;
   canCancel: boolean;
   cancelPending: boolean;
   onCancel: () => void;
@@ -468,16 +515,17 @@ function ActionsMenu(props: ActionsMenuProps) {
     canPreview, previewPending, onPreview,
     canArchive, archivePending, onArchive,
     canUnarchive, unarchivePending, onUnarchive,
+    canDelete, deletePending, onDelete,
     canCancel, cancelPending, onCancel,
   } = props;
 
   const hasOps =
     canPreview || canSendInterrupt || canFocusSteer;
   const hasLifecycle = canArchive || canUnarchive;
-  const hasDestructive = canCancel;
+  const hasDestructive = canCancel || canDelete;
   const hasAny = hasOps || hasLifecycle || hasDestructive;
   const anyPending =
-    previewPending || archivePending || unarchivePending || cancelPending || interruptPending;
+    previewPending || archivePending || unarchivePending || deletePending || cancelPending || interruptPending;
 
   if (!hasAny) return null;
 
@@ -567,6 +615,18 @@ function ActionsMenu(props: ActionsMenuProps) {
             </button>
           </MenuItem>
         )}
+        {canDelete && (
+          <MenuItem>
+            <button
+              type="button"
+              onClick={onDelete}
+              disabled={deletePending}
+              className={MENU_ITEM_DANGER_CLASS}
+            >
+              {deletePending ? "Deleting…" : "Delete"}
+            </button>
+          </MenuItem>
+        )}
       </MenuItems>
     </Menu>
   );