diff --git a/apps/fabro-web/app/components/editable-run-title.test.tsx b/apps/fabro-web/app/components/editable-run-title.test.tsx
new file mode 100644
index 000000000..b94121512
--- /dev/null
+++ b/apps/fabro-web/app/components/editable-run-title.test.tsx
@@ -0,0 +1,192 @@
+import { describe, expect, test } from "bun:test";
+import TestRenderer, { act } from "react-test-renderer";
+import { SWRConfig } from "swr";
+
+import { EditableRunTitle } from "./editable-run-title";
+import { ToastProvider } from "./toast";
+import { generatedAxios } from "../lib/api-client";
+
+function render(node: React.ReactNode): TestRenderer.ReactTestRenderer {
+  let tree: TestRenderer.ReactTestRenderer | undefined;
+  act(() => {
+    tree = TestRenderer.create(
+      <SWRConfig value={{ provider: () => new Map(), dedupingInterval: 0 }}>
+        <ToastProvider>{node}</ToastProvider>
+      </SWRConfig>,
+    );
+  });
+  return tree!;
+}
+
+function instanceText(instance: TestRenderer.ReactTestInstance): string {
+  const parts: string[] = [];
+  for (const child of instance.children) {
+    if (typeof child === "string") parts.push(child);
+    else parts.push(instanceText(child));
+  }
+  return parts.join("");
+}
+
+function findEditButton(
+  tree: TestRenderer.ReactTestRenderer,
+): TestRenderer.ReactTestInstance {
+  return tree.root.findByProps({ "aria-label": "Edit run title" });
+}
+
+function findInput(
+  tree: TestRenderer.ReactTestRenderer,
+): TestRenderer.ReactTestInstance {
+  return tree.root.findByProps({ "aria-label": "Run title" });
+}
+
+describe("EditableRunTitle", () => {
+  test("renders the run title with an edit affordance", () => {
+    const tree = render(<EditableRunTitle runId="run-1" title="Initial title" />);
+    expect(instanceText(findEditButton(tree))).toContain("Initial title");
+  });
+
+  test("clicking the title swaps to an input pre-filled with the current value", () => {
+    const tree = render(<EditableRunTitle runId="run-1" title="Initial title" />);
+    act(() => {
+      findEditButton(tree).props.onClick();
+    });
+    expect(findInput(tree).props.value).toBe("Initial title");
+  });
+
+  test("Enter submits a PATCH and the input collapses back to the heading", async () => {
+    const submitted: unknown[] = [];
+    const originalAdapter = generatedAxios.defaults.adapter;
+    generatedAxios.defaults.adapter = async (config) => {
+      submitted.push({ url: config.url, method: config.method, body: JSON.parse(String(config.data)) });
+      return {
+        data: { id: "run-1", title: "Renamed title" },
+        status: 200,
+        statusText: "OK",
+        headers: {},
+        config,
+      };
+    };
+
+    try {
+      const tree = render(<EditableRunTitle runId="run-1" title="Initial title" />);
+      act(() => {
+        findEditButton(tree).props.onClick();
+      });
+      const input = findInput(tree);
+      act(() => {
+        input.props.onChange({ target: { value: "Renamed title" } });
+      });
+      await act(async () => {
+        input.props.onKeyDown({ key: "Enter", preventDefault: () => {} });
+        await Promise.resolve();
+        await Promise.resolve();
+      });
+
+      expect(submitted).toEqual([
+        { url: "/api/v1/runs/run-1", method: "patch", body: { title: "Renamed title" } },
+      ]);
+    } finally {
+      generatedAxios.defaults.adapter = originalAdapter;
+    }
+  });
+
+  test("Escape exits without sending a request", () => {
+    let calls = 0;
+    const originalAdapter = generatedAxios.defaults.adapter;
+    generatedAxios.defaults.adapter = async (config) => {
+      calls += 1;
+      return {
+        data: undefined,
+        status: 204,
+        statusText: "No Content",
+        headers: {},
+        config,
+      };
+    };
+
+    try {
+      const tree = render(<EditableRunTitle runId="run-1" title="Initial title" />);
+      act(() => {
+        findEditButton(tree).props.onClick();
+      });
+      const input = findInput(tree);
+      act(() => {
+        input.props.onChange({ target: { value: "Discarded" } });
+      });
+      act(() => {
+        input.props.onKeyDown({ key: "Escape", preventDefault: () => {} });
+      });
+
+      expect(calls).toBe(0);
+      expect(instanceText(findEditButton(tree))).toContain("Initial title");
+    } finally {
+      generatedAxios.defaults.adapter = originalAdapter;
+    }
+  });
+
+  test("submitting an empty title does not send a request", async () => {
+    let calls = 0;
+    const originalAdapter = generatedAxios.defaults.adapter;
+    generatedAxios.defaults.adapter = async (config) => {
+      calls += 1;
+      return {
+        data: undefined,
+        status: 200,
+        statusText: "OK",
+        headers: {},
+        config,
+      };
+    };
+
+    try {
+      const tree = render(<EditableRunTitle runId="run-1" title="Initial title" />);
+      act(() => {
+        findEditButton(tree).props.onClick();
+      });
+      const input = findInput(tree);
+      act(() => {
+        input.props.onChange({ target: { value: "   " } });
+      });
+      await act(async () => {
+        input.props.onKeyDown({ key: "Enter", preventDefault: () => {} });
+        await Promise.resolve();
+      });
+
+      expect(calls).toBe(0);
+    } finally {
+      generatedAxios.defaults.adapter = originalAdapter;
+    }
+  });
+
+  test("unchanged title on Enter exits without a request", async () => {
+    let calls = 0;
+    const originalAdapter = generatedAxios.defaults.adapter;
+    generatedAxios.defaults.adapter = async (config) => {
+      calls += 1;
+      return {
+        data: undefined,
+        status: 200,
+        statusText: "OK",
+        headers: {},
+        config,
+      };
+    };
+
+    try {
+      const tree = render(<EditableRunTitle runId="run-1" title="Initial title" />);
+      act(() => {
+        findEditButton(tree).props.onClick();
+      });
+      const input = findInput(tree);
+      await act(async () => {
+        input.props.onKeyDown({ key: "Enter", preventDefault: () => {} });
+        await Promise.resolve();
+      });
+
+      expect(calls).toBe(0);
+      expect(instanceText(findEditButton(tree))).toContain("Initial title");
+    } finally {
+      generatedAxios.defaults.adapter = originalAdapter;
+    }
+  });
+});
diff --git a/apps/fabro-web/app/components/editable-run-title.tsx b/apps/fabro-web/app/components/editable-run-title.tsx
new file mode 100644
index 000000000..8d16fbdba
--- /dev/null
+++ b/apps/fabro-web/app/components/editable-run-title.tsx
@@ -0,0 +1,133 @@
+import { useEffect, useRef, useState } from "react";
+import { PencilIcon } from "@heroicons/react/16/solid";
+
+import { ApiError } from "../lib/api-client";
+import { useUpdateRunTitle } from "../lib/mutations";
+import { InlineMarkdown } from "./inline-markdown";
+import { useToast } from "./toast";
+
+const TITLE_MAX_LENGTH = 100;
+
+function focusInputNextFrame(callback: () => void): void {
+  if (typeof requestAnimationFrame === "function") {
+    requestAnimationFrame(callback);
+  } else {
+    setTimeout(callback, 0);
+  }
+}
+
+export function EditableRunTitle({ runId, title }: { runId: string; title: string }) {
+  const [isEditing, setIsEditing] = useState(false);
+  const [draft, setDraft] = useState(title);
+  const submittedRef = useRef(false);
+  const inputRef = useRef<HTMLInputElement>(null);
+  const updateMutation = useUpdateRunTitle(runId);
+  const { push } = useToast();
+  const isSaving = updateMutation.isMutating;
+
+  useEffect(() => {
+    if (!isEditing) setDraft(title);
+  }, [title, isEditing]);
+
+  const enterEdit = () => {
+    setDraft(title);
+    submittedRef.current = false;
+    setIsEditing(true);
+    focusInputNextFrame(() => {
+      inputRef.current?.focus();
+      inputRef.current?.select();
+    });
+  };
+
+  const exitEdit = () => {
+    setIsEditing(false);
+    setDraft(title);
+  };
+
+  const submit = async () => {
+    if (submittedRef.current) return;
+    const trimmed = draft.trim();
+    if (trimmed === title.trim()) {
+      exitEdit();
+      return;
+    }
+    if (trimmed.length === 0) {
+      push({ message: "Run title can't be blank.", tone: "error" });
+      inputRef.current?.focus();
+      return;
+    }
+    submittedRef.current = true;
+    try {
+      await updateMutation.trigger({ title: trimmed });
+      setIsEditing(false);
+      push({ message: "Run title updated." });
+    } catch (error) {
+      submittedRef.current = false;
+      const message = error instanceof ApiError && error.message
+        ? error.message
+        : "Could not update run title.";
+      push({ message, tone: "error" });
+      focusInputNextFrame(() => inputRef.current?.focus());
+    }
+  };
+
+  if (isEditing) {
+    const remaining = TITLE_MAX_LENGTH - draft.length;
+    const showCount = remaining <= 20;
+    return (
+      <div className="min-w-0">
+        <input
+          ref={inputRef}
+          name="run-title"
+          aria-label="Run title"
+          type="text"
+          value={draft}
+          maxLength={TITLE_MAX_LENGTH}
+          disabled={isSaving}
+          onChange={(e) => setDraft(e.target.value)}
+          onBlur={() => void submit()}
+          onKeyDown={(e) => {
+            if (e.key === "Enter") {
+              e.preventDefault();
+              void submit();
+            } else if (e.key === "Escape") {
+              e.preventDefault();
+              submittedRef.current = true;
+              exitEdit();
+            }
+          }}
+          className="-mx-2 block w-full rounded-md bg-panel-alt px-2 py-0.5 text-xl font-semibold text-fg outline-1 -outline-offset-1 outline-line-strong focus:outline-2 focus:-outline-offset-1 focus:outline-teal-500 disabled:opacity-60"
+        />
+        <p className="mt-1.5 flex items-center gap-2 text-xs text-fg-muted">
+          <span>
+            {isSaving ? "Saving…" : "Press Enter to save · Esc to cancel"}
+          </span>
+          {showCount && !isSaving && (
+            <span className={remaining < 0 ? "text-coral" : "tabular-nums"}>
+              {remaining} left
+            </span>
+          )}
+        </p>
+      </div>
+    );
+  }
+
+  return (
+    <h2 className="text-xl font-semibold text-fg">
+      <button
+        type="button"
+        onClick={enterEdit}
+        aria-label="Edit run title"
+        className="group/title -mx-2 flex min-w-0 max-w-full items-center gap-1.5 rounded-md px-2 py-0.5 text-left text-fg transition-colors hover:bg-overlay focus-visible:bg-overlay focus-visible:outline-2 focus-visible:-outline-offset-1 focus-visible:outline-teal-500"
+      >
+        <span className="min-w-0 truncate">
+          <InlineMarkdown content={title} />
+        </span>
+        <PencilIcon
+          aria-hidden="true"
+          className="size-3.5 shrink-0 text-fg-muted opacity-0 transition-opacity group-hover/title:opacity-100 group-focus-visible/title:opacity-100"
+        />
+      </button>
+    </h2>
+  );
+}
diff --git a/apps/fabro-web/app/lib/mutations.ts b/apps/fabro-web/app/lib/mutations.ts
index 7b2d78615..6ac581d45 100644
--- a/apps/fabro-web/app/lib/mutations.ts
+++ b/apps/fabro-web/app/lib/mutations.ts
@@ -3,14 +3,17 @@ import { useSWRConfig } from "swr";
 import type {
   PreviewUrlResponse,
   RunStatusResponse,
+  RunSummary,
   SteerRunRequest,
   SubmitAnswerRequest,
+  UpdateRunRequest,
 } from "@qltysh/fabro-api-client";
 
 import {
   apiData,
   authApi,
   humanInTheLoopApi,
+  runsApi,
 } from "./api-client";
 import { queryKeys } from "./query-keys";
 import type { LifecycleAction, LifecycleActionError } from "./run-actions";
@@ -101,6 +104,25 @@ function useLifecycleMutation(
   );
 }
 
+export function useUpdateRunTitle(id: string | undefined) {
+  const { mutate } = useSWRConfig();
+  return useSWRMutation(
+    id ? queryKeys.runs.updateTitle(id) : null,
+    async (_key, { arg }: { arg: UpdateRunRequest }): Promise<RunSummary> => {
+      if (!id) throw new Error("id is required");
+      return apiData(() => runsApi.updateRun(id, arg));
+    },
+    {
+      onSuccess: (run) => {
+        if (!id) return;
+        void mutate(queryKeys.runs.detail(id), run, { revalidate: false });
+        void mutate(queryKeys.boards.runs());
+        void mutate(queryKeys.boards.runs(true));
+      },
+    },
+  );
+}
+
 export type SubmitInterviewAnswerArg = {
   questionId: string;
   answer: SubmitAnswerRequest;
diff --git a/apps/fabro-web/app/lib/query-keys.ts b/apps/fabro-web/app/lib/query-keys.ts
index fee209d0e..7f1597692 100644
--- a/apps/fabro-web/app/lib/query-keys.ts
+++ b/apps/fabro-web/app/lib/query-keys.ts
@@ -44,6 +44,7 @@ export const queryKeys = {
     cancel: (id: string) => ["runs", "cancel", id] as const,
     archive: (id: string) => ["runs", "archive", id] as const,
     unarchive: (id: string) => ["runs", "unarchive", id] as const,
+    updateTitle: (id: string) => ["runs", "update-title", id] as const,
     attachUrl: (id: string) => `/api/v1/runs/${pathSegment(id)}/attach`,
   },
   workflows: {
diff --git a/apps/fabro-web/app/routes/run-detail.tsx b/apps/fabro-web/app/routes/run-detail.tsx
index a7b8b66bd..4e4487a64 100644
--- a/apps/fabro-web/app/routes/run-detail.tsx
+++ b/apps/fabro-web/app/routes/run-detail.tsx
@@ -16,7 +16,7 @@ import {
 import { Link, Outlet, useLocation, useMatches, useNavigate } from "react-router";
 import { Menu, MenuButton, MenuItem, MenuItems } from "@headlessui/react";
 
-import { InlineMarkdown } from "../components/inline-markdown";
+import { EditableRunTitle } from "../components/editable-run-title";
 import { InterviewDock } from "../components/interview-dock";
 import { PullRequestChip } from "../components/pull-request-chip";
 import { SteerBar, type SteerBarHandle } from "../components/steer-bar";
@@ -297,9 +297,7 @@ export default function RunDetail({ params }: { params: { id: string } }) {
         )}
       >
         <div className="min-w-0 flex-1">
-          <h2 className="text-xl font-semibold text-fg">
-            <InlineMarkdown content={run.title} />
-          </h2>
+          <EditableRunTitle runId={params.id} title={run.title} />
           <div className="mt-2 flex flex-wrap items-center gap-x-5 gap-y-2 text-sm">
             <span className="flex items-center gap-1.5">
               <span className={`size-2 rounded-full ${run.statusDot}`} />