diff --git a/apps/desktop/src/components/TodoDock.tsx b/apps/desktop/src/components/TodoDock.tsx
index 63cfc561fd..905316d361 100644
--- a/apps/desktop/src/components/TodoDock.tsx
+++ b/apps/desktop/src/components/TodoDock.tsx
@@ -6,8 +6,6 @@ import { IconCheck, IconChevronDown, IconChevronUp } from "./icons";
 import { useSessionTodosRecovery } from "../features/chat/todos/useSessionTodosRecovery";
 import { useAppStore } from "../stores/app-store";
 
-const VISIBLE_LIMIT = 8;
-
 function statusSymbol(status: TodoStatus): string {
   switch (status) {
     case "in_progress":
@@ -38,8 +36,6 @@ export function TodoDock({ sessionId }: { sessionId: string }) {
   const finished = snapshot.todos.every(
     (todo) => todo.status === "completed" || todo.status === "cancelled",
   );
-  const visible = snapshot.todos.slice(0, VISIBLE_LIMIT);
-  const remaining = Math.max(0, snapshot.todos.length - VISIBLE_LIMIT);
   const statusLabel = allCancelled
     ? t("chat.todo.status.cancelled")
     : finished
@@ -65,15 +61,18 @@ export function TodoDock({ sessionId }: { sessionId: string }) {
       </Button>
       <div className="todo-dock-content" aria-hidden={!expanded}>
         <div className="todo-dock-clip">
-          <div className="todo-dock-list" role="list">
-            {visible.map((todo, index) => (
+          {/* The expanded dock lists every row (#1319): the list scrolls
+              inside its own box instead of truncating to a static "N more"
+              line, and a keyboard user can reach that scrollport only while
+              the disclosure is open. */}
+          <div
+            className="todo-dock-list"
+            role="list"
+            tabIndex={expanded ? 0 : -1}
+          >
+            {snapshot.todos.map((todo, index) => (
               <TodoRow key={`${index}:${todo.content}`} todo={todo} />
             ))}
-            {remaining > 0 ? (
-              <div className="todo-dock-more" role="status">
-                {t("chat.todo.more", { count: remaining })}
-              </div>
-            ) : null}
           </div>
         </div>
       </div>
diff --git a/apps/desktop/src/styles/composer.css b/apps/desktop/src/styles/composer.css
index d707048540..51ac04000f 100644
--- a/apps/desktop/src/styles/composer.css
+++ b/apps/desktop/src/styles/composer.css
@@ -833,6 +833,22 @@
   padding: 0 10px 10px;
 }
 
+/* The expanded dock lists every row and scrolls inside its own box (#1319):
+   the Composer keeps its footprint, and reaching the list's end never scrolls
+   the transcript behind it. */
+.todo-dock.is-expanded .todo-dock-list {
+  max-height: min(280px, 30dvh);
+  overflow-y: auto;
+  overscroll-behavior: contain;
+}
+
+/* The scrollport is keyboard reachable while it is on screen; the inset ring
+   stays inside the clip layer that carries the disclosure animation. */
+.todo-dock-list:focus-visible {
+  outline: 2px solid color-mix(in oklab, var(--ds-accent) 72%, transparent);
+  outline-offset: -2px;
+}
+
 .todo-dock-row {
   display: flex;
   min-width: 0;
@@ -876,11 +892,6 @@
   white-space: nowrap;
 }
 
-.todo-dock-more {
-  color: var(--ds-text-muted);
-  font-size: var(--text-2xs);
-}
-
 @media (prefers-reduced-motion: reduce) {
   .composer-mode-chip[data-planning="true"] svg {
     animation: none;
diff --git a/apps/desktop/test/todo-dock-rendering.test.mjs b/apps/desktop/test/todo-dock-rendering.test.mjs
index 66d91d4557..adaae6d55a 100644
--- a/apps/desktop/test/todo-dock-rendering.test.mjs
+++ b/apps/desktop/test/todo-dock-rendering.test.mjs
@@ -54,7 +54,11 @@ test("TodoDock renders bounded session progress and cancelled state", async () =
     assert.match(html, /class="todo-dock-content" aria-hidden="true"/);
     assert.match(html, /class="todo-dock-content" aria-hidden="true"><div class="todo-dock-clip">/);
     assert.match(html, /extra-0/);
-    assert.match(html, /4 more items/);
+    // The expanded dock lists every row (#1319): the whole list is mounted, and
+    // the dock scrolls inside instead of printing a static overflow line.
+    assert.equal((html.match(/role="listitem"/g) ?? []).length, 12, "every ordered row renders");
+    assert.doesNotMatch(html, /more items/);
+    assert.match(html, /class="todo-dock-list" role="list" tabindex="-1"/);
     assert.match(html, /lucide-check/);
 
     Object.assign(useAppStore.getInitialState(), {
@@ -83,5 +87,13 @@ test("TodoDock uses a quiet disclosure animation and state surfaces", async () =
   assert.match(css, /\.todo-dock-content\s*\{[\s\S]*?grid-template-rows:\s*0fr;[\s\S]*?opacity:\s*0;/);
   assert.match(css, /\.todo-dock\.is-expanded \.todo-dock-content\s*\{[\s\S]*?grid-template-rows:\s*1fr;/);
   assert.match(css, /\.todo-dock-row-completed\s*\{[\s\S]*?var\(--ds-success\)/);
+  // The expanded list is the scrollport (#1319): bounded height, internal
+  // scroll, no chaining into the transcript, and reachable from the keyboard.
+  assert.match(
+    css,
+    /\.todo-dock\.is-expanded \.todo-dock-list\s*\{[\s\S]*?max-height:[\s\S]*?overflow-y:\s*auto;[\s\S]*?overscroll-behavior:\s*contain;/,
+  );
+  assert.match(css, /\.todo-dock-list:focus-visible\s*\{[\s\S]*?outline:/);
+  assert.doesNotMatch(css, /\.todo-dock-more\s*\{/);
   assert.match(css, /@media \(prefers-reduced-motion: reduce\)\s*\{[\s\S]*?\.todo-dock-content/);
 });
diff --git a/docs/adr/0312-session-scoped-todo-checklist.md b/docs/adr/0312-session-scoped-todo-checklist.md
index 2ddaca72b8..5dfec9635e 100644
--- a/docs/adr/0312-session-scoped-todo-checklist.md
+++ b/docs/adr/0312-session-scoped-todo-checklist.md
@@ -27,8 +27,10 @@ forwards the notification through the existing IPC bridge, and the renderer
 keeps snapshots keyed by session id while rejecting stale revisions.
 
 The Composer TodoDock is a non-focusing, session-aware presentation surface.
-It shows bounded progress and at most eight ordered rows. Remote RACP sessions
-remain local-only for this vertical slice because RACP v1 has no Todo snapshot
+It shows bounded progress and the complete ordered list: the expanded dock
+scrolls inside its own box instead of truncating, so a long checklist stays
+readable without growing the Composer stack. Remote RACP sessions remain
+local-only for this vertical slice because RACP v1 has no Todo snapshot
 operation; the renderer skips local recovery for those session ids rather than
 reading the local database.
 
@@ -46,4 +48,5 @@ reading the local database.
 Host-core tests cover migration, validation, transaction rollback, restart,
 revision ordering, fork isolation, cascade deletion, and RPC authorization.
 Renderer type checks and TodoDock interaction tests cover revision filtering,
-remote-session degradation, session switching, expansion, and bounded display.
+remote-session degradation, session switching, expansion, and full-list display
+through the dock's own scrollport.
diff --git a/docs/spec/04-ux/08-component-spec.md b/docs/spec/04-ux/08-component-spec.md
index a83fc27084..b2646cc9c0 100644
--- a/docs/spec/04-ux/08-component-spec.md
+++ b/docs/spec/04-ux/08-component-spec.md
@@ -2883,16 +2883,20 @@ reasoning-level control.
 - The collapsed header shows completed/active progress and the current
   `in_progress` content. A checklist whose items are all cancelled has a clear
   cancelled label instead of a misleading `0/0 completed` count.
-- The disclosure is keyboard accessible, does not take focus on updates, resets
-  closed when the active session changes, and shows at most eight ordered rows.
-  The list stays mounted while collapsed so opening and closing can animate with
-  a bounded height/opacity transition; collapsed content is `aria-hidden` and
-  reduced-motion users receive an immediate state change. A collapsed dock
-  reserves only its header row: the list's inset is clipped, never laid out
-  below the header. Completed rows use a success-tinted tile with a check
-  icon, in-progress rows use the accent tint, and cancelled rows are muted;
-  each status symbol has a localized accessible
-  name and each row renders plain text.
+- The disclosure is keyboard accessible, does not take focus on updates, and
+  resets closed when the active session changes. The expanded dock lists every
+  ordered row and scrolls inside its own box (`max-height: min(280px, 30dvh)`,
+  `overflow-y: auto`, `overscroll-behavior: contain`), so a long checklist stays
+  readable without growing the Composer stack and reaching the list's end never
+  scrolls the transcript behind it; that scrollport is keyboard reachable only
+  while the disclosure is open. The list stays mounted while collapsed so
+  opening and closing can animate with a bounded height/opacity transition;
+  collapsed content is `aria-hidden` and reduced-motion users receive an
+  immediate state change. A collapsed dock reserves only its header row: the
+  list's inset is clipped, never laid out below the header.
+  Completed rows use a success-tinted tile with a check icon, in-progress rows
+  use the accent tint, and cancelled rows are muted. Each status symbol has a
+  localized accessible name, and each row renders plain text.
 - Renderer snapshots are keyed by session id. A `todos.changed` event with an
   older or equal revision is ignored. Session activation and host recovery
   re-read the authoritative snapshot, including already cached checklists; a
diff --git a/docs/spec/06-delivery/04-e2e-test-plan.md b/docs/spec/06-delivery/04-e2e-test-plan.md
index e7161ece62..be11b14972 100644
--- a/docs/spec/06-delivery/04-e2e-test-plan.md
+++ b/docs/spec/06-delivery/04-e2e-test-plan.md
@@ -9388,8 +9388,10 @@ must keep splitting are covered by `markdown-blocks.test.mjs`.
 - **Steps**: Start a multi-step Agent turn that calls `TodoWrite` with ordered
   pending and `in_progress` items. Observe the TodoDock above the Composer,
   expand it, switch sessions, and confirm the checklist stays session-scoped.
-  Complete and cancel items, confirm the bounded eight-row display and the
-  all-cancelled label, then clear the checklist and reload/restart the host.
+  Expand a checklist longer than the dock's height cap: every row must render
+  and the list must scroll inside the dock without growing the Composer stack.
+  Complete and cancel items, confirm the all-cancelled label, then clear the
+  checklist and reload/restart the host.
   Deliver an out-of-order older `todos.changed` event and confirm it cannot
   replace the newer snapshot. Exercise invalid payload, Plan/Goal, delegated,
   and remote-session paths.
@@ -9397,6 +9399,7 @@ must keep splitting are covered by `markdown-blocks.test.mjs`.
   advances revision, including clear, and emits one committed `todos.changed`
   snapshot. Invalid or unauthorized writes do not mutate or emit. TodoDock
   renders plain text, does not take focus, resets expansion on session changes,
+  lists every ordered row with the dock's own list as the scrollport,
   keeps a collapsed dock to its header height,
   rejects stale events, and skips local recovery for `remote:` sessions because
   RACP v1 has no Todo snapshot operation.
@@ -9410,8 +9413,9 @@ must keep splitting are covered by `markdown-blocks.test.mjs`.
   the production renderer, and a real host/SQLite profile. Only the external
   model stream and preload transport are fixtures; no live provider or user
   profile is used. The scenario includes Unicode truncation with warning replay,
-  single-active-item normalization, a
-  failed initial read followed by host recovery without changing sessions,
+  single-active-item normalization, full-list rendering with the dock's
+  internal scroll, a failed initial read followed by host recovery without
+  changing sessions,
   cached-snapshot reconciliation, and stale-event rejection. Runtime
   `runtime-todos.test.ts` exercises Agent tool validation, overlong content
   normalization, and continuation through a deterministic provider.
diff --git a/docs/zh-CN/spec/04-ux/08-component-spec.md b/docs/zh-CN/spec/04-ux/08-component-spec.md
index 61b4eb7c51..c6c58f33ab 100644
--- a/docs/zh-CN/spec/04-ux/08-component-spec.md
+++ b/docs/zh-CN/spec/04-ux/08-component-spec.md
@@ -2013,7 +2013,8 @@ MainChat 底部的输入区域，用于撰写和发送提示。支持多行输
 
 - 当活动会话拥有非空的主机清单时，TodoDock 位于 Composer 栈中并显示在 Plan/Goal 批准表面上方；空清单不占布局空间。
 - 收起标题显示完成/活动进度和当前 `in_progress` 内容；全部取消时显示明确的取消状态，不显示误导性的 `0/0 completed`。
-列表在收起时仍保持挂载，但收起状态只占标题行高度（列表内边距被裁剪，不会在标题下方留白），通过有界的高度/透明度过渡播放展开和收起动画；
+- 展开后列出全部条目，并在自身范围内滚动（`max-height: min(280px, 30dvh)`、`overflow-y: auto`、`overscroll-behavior: contain`）：长清单因此保持可读，既不撑高 Composer 栈，滚到底也不会带动背后的转写；该滚动区仅在展开时可被键盘聚焦。
+- 列表在收起时仍保持挂载，但收起状态只占标题行高度（列表内边距被裁剪，不会在标题下方留白），通过有界的高度/透明度过渡播放展开和收起动画。
 - 渲染器按 session id 保存快照并忽略旧或相同 revision。激活会话和主机恢复时重新读取权威快照，包括已缓存清单；首次读取失败不能导致主机恢复后清单持续隐藏。`remote:` 和 `native-pi:` 会话不拥有本地 Desktop 清单，跳过本地 `todos.get` 恢复；远程 Todo 对等能力留待新增 RACP 契约。
 
 ### 11.4 状态
diff --git a/docs/zh-CN/spec/06-delivery/04-e2e-test-plan.md b/docs/zh-CN/spec/06-delivery/04-e2e-test-plan.md
index fad21938fe..10a1e5641b 100644
--- a/docs/zh-CN/spec/06-delivery/04-e2e-test-plan.md
+++ b/docs/zh-CN/spec/06-delivery/04-e2e-test-plan.md
@@ -5555,12 +5555,12 @@ eleven-tool-round desktop paths are verified by
 **E2E-CHAT-session-todo-checklist：TodoWrite 到按会话显示的 TodoDock**
 
 - **前提：** 隔离的本地 Electron 配置、确定性的 Agent/Host fixture、两个 Desktop 会话，不使用真实 Provider 或付费 API。
-- **步骤：** 启动调用 `TodoWrite` 的多步骤 Agent 回合，观察 Composer 上方的 TodoDock，展开后切换会话并确认清单隔离。完成和取消条目，确认最多显示八条以及全部取消状态；清空清单后重载/重启 Host。发送乱序旧 `todos.changed` 事件，确认它不能覆盖新快照；再覆盖非法参数、Plan/Goal、委托和远程会话路径。
-切换会话时收起、收起状态只占标题行高度、拒绝旧事件
+- **步骤：** 启动调用 `TodoWrite` 的多步骤 Agent 回合，观察 Composer 上方的 TodoDock，展开后切换会话并确认清单隔离。展开一个超过 dock 高度上限的清单，确认渲染全部条目、列表在 dock 内滚动而不撑高 Composer 栈；完成和取消条目，确认全部取消状态；清空清单后重载/重启 Host。发送乱序旧 `todos.changed` 事件，确认它不能覆盖新快照；再覆盖非法参数、Plan/Goal、委托和远程会话路径。
+- **预期：** 切换会话时收起、收起状态只占标题行高度、列表渲染全部条目并以自身为滚动容器、拒绝旧事件。
 - **链接规格：** `03-runtime/03-tools-and-permissions.md`、`03-runtime/04-data-storage.md`、`03-runtime/06-host-rpc-protocol.md`、`04-ux/08-component-spec.md`、ADR 0312。
 - **验收：** C / E / F / Quality / Security。
 - **里程碑：** M6+。
-- **自动化：** `pnpm test:e2e:todos` 从生产 Agent 的 ToolSearch/TodoWrite 路径进入，使用生产渲染器、真实 Host/SQLite 和隔离 Electron 配置验证清单旅程；仅替换外部模型流和 preload 传输，不使用真实 Provider 或用户配置。覆盖 Unicode 截断及警告重放、单一活动项归一化、首次读取失败后不切换会话的主机恢复、已缓存快照重新同步及旧事件拒绝。运行时 `runtime-todos.test.ts` 使用确定性 Provider 验证 Agent 工具校验、超长内容归一化和续跑。
+- **自动化：** `pnpm test:e2e:todos` 从生产 Agent 的 ToolSearch/TodoWrite 路径进入，使用生产渲染器、真实 Host/SQLite 和隔离 Electron 配置验证清单旅程；仅替换外部模型流和 preload 传输，不使用真实 Provider 或用户配置。覆盖 Unicode 截断及警告重放、单一活动项归一化、全量清单渲染与 dock 内滚动、首次读取失败后不切换会话的主机恢复、已缓存快照重新同步及旧事件拒绝。运行时 `runtime-todos.test.ts` 使用确定性 Provider 验证 Agent 工具校验、超长内容归一化和续跑。
 - **状态：** 构建 Desktop 和 Host 后，在确切的请求候选中执行。Host-core 和渲染器定向测试是辅助检查，不能替代 Electron 用户旅程。
 
 ## 8. 可追溯性矩阵
diff --git a/packages/i18n/src/locales/de/index.ts b/packages/i18n/src/locales/de/index.ts
index e81a8344eb..5e5cedde74 100644
--- a/packages/i18n/src/locales/de/index.ts
+++ b/packages/i18n/src/locales/de/index.ts
@@ -284,7 +284,6 @@ export const de = {
       "progress": "{{completed}}/{{total}} erledigt",
       "current": "{{completed}}/{{total}} · Aktuell: {{content}}",
       "completed": "{{completed}}/{{total}} erledigt",
-      "more": "{{count}} weitere Elemente",
       "updated": "Checkliste aktualisiert",
       "updating": "Checkliste wird aktualisiert",
       "status": { "pending": "Offen", "in_progress": "In Bearbeitung", "completed": "Erledigt", "cancelled": "Abgebrochen" }
diff --git a/packages/i18n/src/locales/en/index.ts b/packages/i18n/src/locales/en/index.ts
index b36374fee1..fff8171ff9 100644
--- a/packages/i18n/src/locales/en/index.ts
+++ b/packages/i18n/src/locales/en/index.ts
@@ -291,7 +291,6 @@ export const en = {
       progress: "{{completed}}/{{total}} completed",
       current: "{{completed}}/{{total}} · Current: {{content}}",
       completed: "{{completed}}/{{total}} completed",
-      more: "{{count}} more items",
       updated: "Checklist updated",
       updating: "Updating checklist",
       status: {
diff --git a/packages/i18n/src/locales/es/index.ts b/packages/i18n/src/locales/es/index.ts
index 66fa3c9995..88ecbd6c81 100644
--- a/packages/i18n/src/locales/es/index.ts
+++ b/packages/i18n/src/locales/es/index.ts
@@ -284,7 +284,6 @@ export const es = {
       "progress": "{{completed}}/{{total}} completadas",
       "current": "{{completed}}/{{total}} · Actual: {{content}}",
       "completed": "{{completed}}/{{total}} completadas",
-      "more": "{{count}} elementos más",
       "updated": "Lista actualizada",
       "updating": "Actualizando lista",
       "status": { "pending": "Pendiente", "in_progress": "En curso", "completed": "Completada", "cancelled": "Cancelada" }
diff --git a/packages/i18n/src/locales/fr/index.ts b/packages/i18n/src/locales/fr/index.ts
index e218a265a4..e7296977cf 100644
--- a/packages/i18n/src/locales/fr/index.ts
+++ b/packages/i18n/src/locales/fr/index.ts
@@ -284,7 +284,6 @@ export const fr = {
       "progress": "{{completed}}/{{total}} terminées",
       "current": "{{completed}}/{{total}} · Actuelle : {{content}}",
       "completed": "{{completed}}/{{total}} terminées",
-      "more": "{{count}} éléments supplémentaires",
       "updated": "Liste mise à jour",
       "updating": "Mise à jour de la liste",
       "status": { "pending": "En attente", "in_progress": "En cours", "completed": "Terminée", "cancelled": "Annulée" }
diff --git a/packages/i18n/src/locales/ko/index.ts b/packages/i18n/src/locales/ko/index.ts
index 5674b9ba37..46df6c31aa 100644
--- a/packages/i18n/src/locales/ko/index.ts
+++ b/packages/i18n/src/locales/ko/index.ts
@@ -293,7 +293,6 @@ export const ko = {
       progress: "{{completed}}/{{total}} 완료",
       current: "{{completed}}/{{total}} · 현재: {{content}}",
       completed: "{{completed}}/{{total}} 완료",
-      more: "{{count}}개 더 있음",
       updated: "체크리스트 업데이트됨",
       updating: "체크리스트 업데이트 중",
       status: { pending: "대기", in_progress: "진행 중", completed: "완료", cancelled: "취소됨" },
diff --git a/packages/i18n/src/locales/pt-BR/index.ts b/packages/i18n/src/locales/pt-BR/index.ts
index 479d407a6b..4e1e0050c9 100644
--- a/packages/i18n/src/locales/pt-BR/index.ts
+++ b/packages/i18n/src/locales/pt-BR/index.ts
@@ -283,7 +283,6 @@ export const ptBR = {
       progress: "{{completed}}/{{total}} concluídos",
       current: "{{completed}}/{{total}} · Atual: {{content}}",
       completed: "{{completed}}/{{total}} concluídos",
-      more: "Mais {{count}} itens",
       updated: "Checklist atualizado",
       updating: "Atualizando checklist",
       status: { pending: "Pendente", in_progress: "Em andamento", completed: "Concluído", cancelled: "Cancelado" },
diff --git a/packages/i18n/src/locales/tr/index.ts b/packages/i18n/src/locales/tr/index.ts
index c10e713717..9e289f0d30 100644
--- a/packages/i18n/src/locales/tr/index.ts
+++ b/packages/i18n/src/locales/tr/index.ts
@@ -293,7 +293,6 @@ export const tr = {
       progress: "{{completed}}/{{total}} tamamlandı",
       current: "{{completed}}/{{total}} · Geçerli: {{content}}",
       completed: "{{completed}}/{{total}} tamamlandı",
-      more: "{{count}} öğe daha",
       updated: "Kontrol listesi güncellendi",
       updating: "Kontrol listesi güncelleniyor",
       status: { pending: "Bekliyor", in_progress: "Devam ediyor", completed: "Tamamlandı", cancelled: "İptal edildi" },
diff --git a/packages/i18n/src/locales/zh-CN/index.ts b/packages/i18n/src/locales/zh-CN/index.ts
index c1249d6c84..4592e6edd3 100644
--- a/packages/i18n/src/locales/zh-CN/index.ts
+++ b/packages/i18n/src/locales/zh-CN/index.ts
@@ -286,7 +286,6 @@ export const zhCN = {
       progress: "已完成 {{completed}}/{{total}}",
       current: "{{completed}}/{{total}} · 当前：{{content}}",
       completed: "已完成 {{completed}}/{{total}}",
-      more: "还有 {{count}} 项",
       updated: "清单已更新",
       updating: "正在更新清单",
       status: { pending: "待办", in_progress: "进行中", completed: "已完成", cancelled: "已取消" },
diff --git a/packages/i18n/src/locales/zh-TW/index.ts b/packages/i18n/src/locales/zh-TW/index.ts
index 5c6a787505..89f35eca03 100644
--- a/packages/i18n/src/locales/zh-TW/index.ts
+++ b/packages/i18n/src/locales/zh-TW/index.ts
@@ -286,7 +286,6 @@ export const zhTW = {
       progress: "已完成 {{completed}}/{{total}}",
       current: "{{completed}}/{{total}} · 目前：{{content}}",
       completed: "已完成 {{completed}}/{{total}}",
-      more: "還有 {{count}} 項",
       updated: "清單已更新",
       updating: "正在更新清單",
       status: { pending: "待辦", in_progress: "進行中", completed: "已完成", cancelled: "已取消" },
diff --git a/scripts/e2e/todo-checklist.tsx b/scripts/e2e/todo-checklist.tsx
index ef6f579d9a..1aadd4d029 100644
--- a/scripts/e2e/todo-checklist.tsx
+++ b/scripts/e2e/todo-checklist.tsx
@@ -72,11 +72,21 @@ window.todoChecklistProbe = async () => {
   checks.push("collapsed-dock-reserves-no-blank-height");
   flushSync(() => header()!.click());
   await until(() => header()?.getAttribute("aria-expanded") === "true", "Click must expand dock");
-  assert(document.querySelectorAll(".todo-dock-row").length === 8, "Expanded list is capped at eight rows");
+  // The expanded dock lists every row and scrolls inside its own box (#1319).
+  assert(document.querySelectorAll(".todo-dock-row").length === 10, "Expanded list renders every row");
+  const list = document.querySelector<HTMLElement>(".todo-dock-list")!;
+  assert(getComputedStyle(list).overflowY === "auto", "The expanded list is the scroll container");
+  assert(list.scrollHeight > list.clientHeight, "A long checklist scrolls inside the dock instead of growing it");
+  assert(Math.round(list.clientHeight) <= 280, `The dock list keeps a bounded height (${list.clientHeight}px)`);
+  assert(getComputedStyle(list).overscrollBehaviorY === "contain",
+    "Reaching the list's end must not scroll the transcript");
+  assert(list.tabIndex === 0, "The expanded list is keyboard reachable");
   await until(() => Math.round(box(".todo-dock-clip").height) === Math.round(box(".todo-dock-list").height),
     "Expanded clip must match the listed rows once the disclosure transition settles");
-  assert(document.querySelector(".todo-dock-more")?.textContent?.includes("2"), "Overflow count must render");
-  checks.push("agent-prompt-tool-discovery-host-write-event-dock-expand-bounded-list");
+  assert(!document.querySelector(".todo-dock-more"), "No static overflow line remains");
+  assert(Math.round(box(".todo-dock").height) < 400,
+    `The dock keeps a bounded footprint (${dockGeometry()})`);
+  checks.push("agent-prompt-tool-discovery-host-write-event-dock-expand-full-scrolling-list");
   const normalized = await write(first, [
     { content: "😀".repeat(501), status: "in_progress", priority: "high" },
     { content: "Second active item", status: "in_progress", priority: "medium" },