diff --git a/.yoi/objectives/00001KWW44EXK/item.md b/.yoi/objectives/00001KWW44EXK/item.md
index b46d151c..efe96f46 100644
--- a/.yoi/objectives/00001KWW44EXK/item.md
+++ b/.yoi/objectives/00001KWW44EXK/item.md
@@ -2,7 +2,7 @@
 title: "Runtime working directory materialization and sandboxed agent environments"
 state: "active"
 created_at: "2026-07-06T16:28:12Z"
-updated_at: "2026-07-07T12:40:00Z"
+updated_at: "2026-07-10T00:00:00Z"
 linked_tickets: ["00001KWPC13WQ", "00001KWMBAA6V"]
 ---
 
@@ -34,7 +34,8 @@ Yoi は Workspace / Repository / Runtime を分ける方針になっている。
 
 - Runtime root: Runtime が自身の store、cache、Worker metadata、working directory allocation を管理する root。長期的には `~/.yoi/runtimes/<runtime-id>/` 配下など、Workspace backend store とは別に置く。
 - Repository cache: Runtime-local の共有 source/cache。Git なら bare mirror / object cache / packfile cache など。重く、長寿命で、複数 Worker allocation から共有される。
-- working directory: Worker ごとの作業環境。短寿命で、Worker が読み書きする root / mounts / scratch / overlay を含む。Browser-facing UI/API では `Workspace` と混同しないよう、この呼称に寄せる。`Volume` は storage backing の候補名であり、この作業領域そのものの呼称にはしない。
+- working directory: Worker ごとの作業環境。短寿命で、Worker が読み書きする root / mounts / scratch / overlay を含む。Browser-facing UI では `workspace` と混同しないよう `workdir` と表示してよい。`Volume` は storage backing の候補名であり、この作業領域そのものの呼称にはしない。
+- Worker archive: 作業単位として保存する Worker record。profile、Runtime、RepositoryPoint / workdir evidence、session/transcript refs、status、diagnostics、summary、retention policy を束ねる。Session 単体ではなく Worker archive を保存単位にする。
 - Materialization strategy: RepositoryPoint から working directory を作る実装戦略。Git detached worktree、sparse checkout、CoW snapshot、reflink copy、overlay、container filesystem など。
 - WorkingDirectoryAllocation: Runtime が払い出した作業環境の record。allocation id、worker id、workspace id、repository point、materializer kind、root、mounts、cleanup policy、status を持つ。
 - Sandbox policy: Worker が見られる filesystem、network、process、secret、tool authority の境界を表す policy。
@@ -286,6 +287,17 @@ Rift の filtered CoW creation のように、重い artifacts を除外しな
 - Runtime が複数 Workspace / Repository の Worker を同時に抱える場合の namespace、quota、cleanup、audit boundary を固める。
 - remote/self-hosted/hosted Runtime fleet で repository cache と working directory storage をどう扱うかを設計する。
 
+### 7. Worker / Session / workdir retention policy
+
+- Worker を保存単位にする。Session / transcript は Worker archive に内包または参照される履歴として扱い、Session 単体を長期保存 authority にしない。
+- Worker archive には retention policy を持たせる。少なくとも `active` / `archived` / `pinned` / `prunable` 相当の状態を表現できること。`pinned` は必要であり、明示的に残す作業記録を cleanup / prune から守る。
+- Session / transcript は削除可能にする。Worker が retained/pinned なら full history を残せるが、Worker prune 時には session files を削除、または summary だけ残して full transcript を捨てられるようにする。
+- Workdir 実ファイルは durable history ではなく再現可能 cache として扱う。RepositoryPoint / resolved commit から再現でき、dirty/uncommitted state が無いなら、停止済み Worker に紐づく workdir files は cleanup eligible とする。
+- Workdir record は Runtime-owned materialization evidence として扱う。実ファイルが削除済みなら `removed`、実ファイルが外部要因で欠落しているなら stale/missing materialization として診断可能にする。
+- Workdir と Worker の関係は、Worker archive 側に workdir binding summary / RepositoryPoint / resolved commit を保存する。Workdir list で linked Workers を見せる場合は、まず Worker records から derived view を作る。
+- Prune は plan-first にする。削除前に対象、理由、削除される bytes、残る archive/summary、blocking conditions（running Worker、pinned Worker、dirty state、unreachable commit など）を提示する。
+- UI 表示は `workdir` に寄せる。内部型/API の互換名 `working_directory` は移行中に残ってよいが、Browser-facing navigation では Runtime 管理配下の `Workdirs` として扱う。
+
 ## Non-goals
 
 - v0 で完全な container sandbox を実装すること。
@@ -307,6 +319,8 @@ Rift の filtered CoW creation のように、重い artifacts を除外しな
 - Runtime process 起動時の `--workspace` は legacy bootstrap input として隔離され、Runtime identity や single workspace binding とみなされない。
 - Worker ごとの scope allocation conflict が、同一 source root を直接渡す設計ではなく materialized workspace allocation によって解消される。
 - Sandbox / mount / cache / secret boundary を後続実装で強化できる model になっている。
+- Worker archive が Session / transcript refs と retention policy を束ね、`pinned` Worker を prune から守れる。
+- Workdir 実ファイルは再現可能 cache として cleanup/prune でき、削除前に plan-first で linked Worker、session retention、commit reachability、dirty/missing 状態を確認できる。
 
 ## References
 
diff --git a/web/workspace/src/app.css b/web/workspace/src/app.css
index de0d7490..94d5ca9a 100644
--- a/web/workspace/src/app.css
+++ b/web/workspace/src/app.css
@@ -463,6 +463,47 @@
         padding: 0;
     }
 
+    .workspace-actions {
+        display: grid;
+        grid-template-columns: repeat(2, minmax(0, 1fr));
+        gap: var(--space-3);
+    }
+
+    .workspace-action-card {
+        display: grid;
+        gap: var(--space-1);
+        padding: var(--space-4);
+        border: 1px solid var(--line);
+        border-radius: var(--radius-card);
+        background: var(--bg-raised);
+        color: inherit;
+        text-decoration: none;
+    }
+
+    .workspace-action-card:hover,
+    .workspace-action-card:focus-visible {
+        border-color: var(--accent);
+    }
+
+    .workspace-action-card span,
+    .workspace-action-card small {
+        color: var(--text-muted);
+    }
+
+    .workspace-action-card span {
+        font-size: 0.78rem;
+    }
+
+    .workspace-action-card strong {
+        color: var(--text-strong);
+    }
+
+    @media (max-width: 720px) {
+        .workspace-actions {
+            grid-template-columns: 1fr;
+        }
+    }
+
     .runtime-card {
         padding: 0;
     }
@@ -646,11 +687,7 @@
         text-transform: uppercase;
     }
 
-    .workers-page {
-        display: grid;
-        gap: var(--space-4);
-    }
-
+    .page-header-row,
     .workers-page-header {
         display: flex;
         justify-content: space-between;
@@ -658,22 +695,43 @@
         gap: var(--space-4);
     }
 
+    .page-header-row h1,
+    .page-header-row p,
     .workers-page-header h1,
     .workers-page-header p {
         margin: 0;
     }
 
+    .page-header-row h1,
     .workers-page-header h1 {
         color: var(--text-strong);
         font-size: clamp(1.6rem, 4vw, 2.4rem);
         line-height: 1.05;
     }
 
+    .page-header-row p:not(.breadcrumb),
     .workers-page-header p {
         margin-top: var(--space-2);
         color: var(--text-muted);
     }
 
+    .breadcrumb {
+        margin-bottom: var(--space-2);
+        color: var(--text-muted);
+        font-size: 0.85rem;
+    }
+
+    .breadcrumb a {
+        color: inherit;
+    }
+
+    .runtimes-page,
+    .workdirs-page,
+    .workers-page {
+        display: grid;
+        gap: var(--space-4);
+    }
+
     .workers-table-wrap {
         border-top: 1px solid var(--line);
     }
diff --git a/web/workspace/src/lib/workspace-console/worker-console.ui.test.ts b/web/workspace/src/lib/workspace-console/worker-console.ui.test.ts
index 23bbf053..63117750 100644
--- a/web/workspace/src/lib/workspace-console/worker-console.ui.test.ts
+++ b/web/workspace/src/lib/workspace-console/worker-console.ui.test.ts
@@ -23,6 +23,11 @@ Deno.test("workspace Worker list lives on the dedicated Workers page", async ()
     new URL("../workspace-sidebar/WorkspaceSidebar.svelte", import.meta.url),
   );
 
+  assert(
+    workspacePage.includes('href={`/w/${workspaceId}/runtimes`}') &&
+      workspacePage.includes('href={`/w/${workspaceId}/workers`}'),
+    "top workspace page should link to Runtimes and Workers pages",
+  );
   assert(
     !workspacePage.includes("workerConsoleHref") &&
       !workspacePage.includes("Open Console"),
@@ -47,6 +52,43 @@ Deno.test("workspace Worker list lives on the dedicated Workers page", async ()
   );
 });
 
+Deno.test("workspace Runtime management pages expose Runtimes and Runtime-owned workdirs", async () => {
+  const sidebar = await Deno.readTextFile(
+    new URL("../workspace-sidebar/WorkspaceSidebar.svelte", import.meta.url),
+  );
+  const runtimesNav = await Deno.readTextFile(
+    new URL("../workspace-sidebar/RuntimesNavSection.svelte", import.meta.url),
+  );
+  const runtimesPage = await Deno.readTextFile(
+    new URL("./../../routes/w/[workspaceId]/runtimes/+page.svelte", import.meta.url),
+  );
+  const workdirsPage = await Deno.readTextFile(
+    new URL("./../../routes/w/[workspaceId]/runtimes/[runtimeId]/workdirs/+page.svelte", import.meta.url),
+  );
+  const workdirsLoad = await Deno.readTextFile(
+    new URL("./../../routes/w/[workspaceId]/runtimes/[runtimeId]/workdirs/+page.ts", import.meta.url),
+  );
+
+  assert(
+    sidebar.includes("RuntimesNavSection") &&
+      runtimesNav.includes('href={runtimesHref}') &&
+      runtimesNav.includes("/runtimes"),
+    "sidebar should expose Runtime management navigation",
+  );
+  assert(
+    runtimesPage.includes("Open workdirs") &&
+      runtimesPage.includes("runtimes-table") &&
+      runtimesPage.includes("/workdirs"),
+    "Runtimes page should table Runtimes and link to each Runtime's workdirs",
+  );
+  assert(
+    workdirsPage.includes("Workdirs") &&
+      workdirsPage.includes("workdirs-table") &&
+      workdirsLoad.includes("/working-directories"),
+    "Workdirs page should read Runtime-owned working-directory API while using workdir UI language",
+  );
+});
+
 Deno.test("workspace Worker sidebar links New to the dedicated create page", async () => {
   const workersNav = await Deno.readTextFile(
     new URL("../workspace-sidebar/WorkersNavSection.svelte", import.meta.url),
diff --git a/web/workspace/src/lib/workspace-sidebar/RuntimesNavSection.svelte b/web/workspace/src/lib/workspace-sidebar/RuntimesNavSection.svelte
new file mode 100644
index 00000000..4cace34f
--- /dev/null
+++ b/web/workspace/src/lib/workspace-sidebar/RuntimesNavSection.svelte
@@ -0,0 +1,23 @@
+<script lang="ts">
+  type Props = {
+    currentPath?: string;
+    workspaceId: string;
+  };
+
+  let { currentPath = '/', workspaceId }: Props = $props();
+  let runtimesHref = $derived(workspaceId ? `/w/${workspaceId}/runtimes` : '/runtimes');
+  let active = $derived(currentPath === runtimesHref || currentPath.startsWith(`${runtimesHref}/`));
+</script>
+
+<section class="sidebar-section" aria-labelledby="runtimes-heading">
+  <div class="section-heading-row">
+    <h2 id="runtimes-heading">
+      <a
+        class="section-heading-link"
+        class:active
+        href={runtimesHref}
+        aria-current={active ? 'page' : undefined}
+      >runtimes</a>
+    </h2>
+  </div>
+</section>
diff --git a/web/workspace/src/lib/workspace-sidebar/WorkspaceSidebar.svelte b/web/workspace/src/lib/workspace-sidebar/WorkspaceSidebar.svelte
index 63a1ec03..36100250 100644
--- a/web/workspace/src/lib/workspace-sidebar/WorkspaceSidebar.svelte
+++ b/web/workspace/src/lib/workspace-sidebar/WorkspaceSidebar.svelte
@@ -2,6 +2,7 @@
   import { workspaceRoute } from '$lib/workspace-api/http';
   import ObjectivesNavSection from './ObjectivesNavSection.svelte';
   import RepositoriesNavSection from './RepositoriesNavSection.svelte';
+  import RuntimesNavSection from './RuntimesNavSection.svelte';
   import WorkersNavSection from './WorkersNavSection.svelte';
   import type { RepositoryListResponse, WorkspaceResponse } from './types';
 
@@ -106,6 +107,7 @@
     <nav class="sidebar-sections" aria-label="Workspace sections">
       <RepositoriesNavSection {repositories} {repositoriesError} {currentPath} {workspaceId} />
       <ObjectivesNavSection {currentPath} {workspaceId} />
+      <RuntimesNavSection {currentPath} {workspaceId} />
       <WorkersNavSection {currentPath} {workspaceId} />
     </nav>
   {/if}
diff --git a/web/workspace/src/routes/w/[workspaceId]/+page.svelte b/web/workspace/src/routes/w/[workspaceId]/+page.svelte
index 09192810..016f9a4d 100644
--- a/web/workspace/src/routes/w/[workspaceId]/+page.svelte
+++ b/web/workspace/src/routes/w/[workspaceId]/+page.svelte
@@ -2,6 +2,7 @@
   import type { PageProps } from './$types';
 
   let { data }: PageProps = $props();
+  let workspaceId = $derived(data.workspace?.workspace_id ?? data.workspaceId);
 </script>
 
 <svelte:head>
@@ -37,6 +38,19 @@
   {/if}
 </section>
 
+<section class="workspace-actions" aria-label="Workspace sections">
+  <a class="workspace-action-card" href={`/w/${workspaceId}/runtimes`}>
+    <span>Runtimes</span>
+    <strong>Manage runtimes and workdirs</strong>
+    <small>{data.hosts?.items.length ?? 0} host{(data.hosts?.items.length ?? 0) === 1 ? '' : 's'} visible</small>
+  </a>
+  <a class="workspace-action-card" href={`/w/${workspaceId}/workers`}>
+    <span>Workers</span>
+    <strong>Open worker list</strong>
+    <small>Inspect status and attach to consoles</small>
+  </a>
+</section>
+
 <section class="card">
   <h2>Hosts</h2>
   {#if data.hosts}
diff --git a/web/workspace/src/routes/w/[workspaceId]/runtimes/+page.svelte b/web/workspace/src/routes/w/[workspaceId]/runtimes/+page.svelte
new file mode 100644
index 00000000..f4bd641f
--- /dev/null
+++ b/web/workspace/src/routes/w/[workspaceId]/runtimes/+page.svelte
@@ -0,0 +1,72 @@
+<script lang="ts">
+  import type { Runtime } from '$lib/workspace-sidebar/types';
+  import type { PageProps } from './$types';
+
+  let { data }: PageProps = $props();
+
+  function runtimeScope(runtime: Runtime): string {
+    return runtime.capabilities.workspace_scope;
+  }
+
+  function runtimePlatform(runtime: Runtime): string {
+    return `${runtime.capabilities.os} / ${runtime.capabilities.arch}`;
+  }
+</script>
+
+<svelte:head>
+  <title>Runtimes · Yoi Workspace</title>
+  <meta name="description" content="Workspace Runtimes" />
+</svelte:head>
+
+<section class="runtimes-page" aria-labelledby="runtimes-heading">
+  <header class="page-header-row">
+    <div>
+      <h1 id="runtimes-heading">Runtimes</h1>
+      <p>Execution backends available to this workspace.</p>
+    </div>
+  </header>
+
+  {#if data.runtimesError}
+    <p class="section-state error">{data.runtimesError}</p>
+  {:else if !data.runtimes}
+    <p class="section-state">Loading Runtimes…</p>
+  {:else if data.runtimes.items.length === 0}
+    <p class="section-state">No Runtimes are visible.</p>
+  {:else}
+    <div class="table-wrap">
+      <table class="runtimes-table">
+        <thead>
+          <tr>
+            <th>Runtime</th>
+            <th>Kind</th>
+            <th>Status</th>
+            <th>Scope</th>
+            <th>Platform</th>
+            <th>Capacity</th>
+            <th>Workdirs</th>
+          </tr>
+        </thead>
+        <tbody>
+          {#each data.runtimes.items as runtime}
+            <tr>
+              <td>
+                <strong>{runtime.label}</strong>
+                <small><code>{runtime.runtime_id}</code></small>
+              </td>
+              <td>{runtime.kind}</td>
+              <td>{runtime.status}</td>
+              <td>{runtimeScope(runtime)}</td>
+              <td>{runtimePlatform(runtime)}</td>
+              <td>{runtime.capabilities.max_workers} workers</td>
+              <td>
+                <a class="inline-link" href={`/w/${data.workspaceId}/runtimes/${encodeURIComponent(runtime.runtime_id)}/workdirs`}>
+                  Open workdirs
+                </a>
+              </td>
+            </tr>
+          {/each}
+        </tbody>
+      </table>
+    </div>
+  {/if}
+</section>
diff --git a/web/workspace/src/routes/w/[workspaceId]/runtimes/+page.ts b/web/workspace/src/routes/w/[workspaceId]/runtimes/+page.ts
new file mode 100644
index 00000000..dd217b97
--- /dev/null
+++ b/web/workspace/src/routes/w/[workspaceId]/runtimes/+page.ts
@@ -0,0 +1,16 @@
+import { loadJson, workspaceApiPath } from "$lib/workspace-api/http";
+import type { ListResponse, Runtime } from "$lib/workspace-sidebar/types";
+import type { PageLoad } from "./$types";
+
+export const load: PageLoad = async ({ fetch, params }) => {
+  const runtimes = await loadJson<ListResponse<Runtime>>(
+    fetch,
+    workspaceApiPath(params.workspaceId, "/runtimes"),
+  );
+
+  return {
+    workspaceId: params.workspaceId,
+    runtimes: runtimes.data,
+    runtimesError: runtimes.error,
+  };
+};
diff --git a/web/workspace/src/routes/w/[workspaceId]/runtimes/[runtimeId]/workdirs/+page.svelte b/web/workspace/src/routes/w/[workspaceId]/runtimes/[runtimeId]/workdirs/+page.svelte
new file mode 100644
index 00000000..a7692aab
--- /dev/null
+++ b/web/workspace/src/routes/w/[workspaceId]/runtimes/[runtimeId]/workdirs/+page.svelte
@@ -0,0 +1,70 @@
+<script lang="ts">
+  import type { WorkingDirectorySummary } from '$lib/workspace-sidebar/types';
+  import type { PageProps } from './$types';
+
+  let { data }: PageProps = $props();
+  let runtimeLabel = $derived(
+    data.runtimes?.items.find((runtime) => runtime.runtime_id === data.runtimeId)?.label ?? data.runtimeId,
+  );
+
+  function commitLabel(workdir: WorkingDirectorySummary): string {
+    return workdir.resolved_commit ? workdir.resolved_commit.slice(0, 12) : '—';
+  }
+
+  function selectorLabel(workdir: WorkingDirectorySummary): string {
+    return workdir.requested_selector ?? 'HEAD';
+  }
+</script>
+
+<svelte:head>
+  <title>Workdirs · {runtimeLabel} · Yoi Workspace</title>
+  <meta name="description" content="Runtime workdirs" />
+</svelte:head>
+
+<section class="workdirs-page" aria-labelledby="workdirs-heading">
+  <header class="page-header-row">
+    <div>
+      <p class="breadcrumb"><a href={`/w/${data.workspaceId}/runtimes`}>Runtimes</a> / {runtimeLabel}</p>
+      <h1 id="workdirs-heading">Workdirs</h1>
+      <p>Workdirs owned by <code>{data.runtimeId}</code>.</p>
+    </div>
+  </header>
+
+  {#if data.workdirsError}
+    <p class="section-state error">{data.workdirsError}</p>
+  {:else if !data.workdirs}
+    <p class="section-state">Loading workdirs…</p>
+  {:else if data.workdirs.items.length === 0}
+    <p class="section-state">No workdirs are visible for this Runtime.</p>
+  {:else}
+    <div class="table-wrap">
+      <table class="workdirs-table">
+        <thead>
+          <tr>
+            <th>Workdir</th>
+            <th>Repository</th>
+            <th>Selector</th>
+            <th>Commit</th>
+            <th>Status</th>
+            <th>Policy</th>
+          </tr>
+        </thead>
+        <tbody>
+          {#each data.workdirs.items as workdir}
+            <tr>
+              <td><code>{workdir.working_directory_id}</code></td>
+              <td>{workdir.repository_id}</td>
+              <td>{selectorLabel(workdir)}</td>
+              <td><code>{commitLabel(workdir)}</code></td>
+              <td>{workdir.status}</td>
+              <td>
+                <span>{workdir.dirty_state_policy}</span>
+                <small>{workdir.cleanup_policy}</small>
+              </td>
+            </tr>
+          {/each}
+        </tbody>
+      </table>
+    </div>
+  {/if}
+</section>
diff --git a/web/workspace/src/routes/w/[workspaceId]/runtimes/[runtimeId]/workdirs/+page.ts b/web/workspace/src/routes/w/[workspaceId]/runtimes/[runtimeId]/workdirs/+page.ts
new file mode 100644
index 00000000..ab9122d0
--- /dev/null
+++ b/web/workspace/src/routes/w/[workspaceId]/runtimes/[runtimeId]/workdirs/+page.ts
@@ -0,0 +1,30 @@
+import { loadJson, workspaceApiPath } from "$lib/workspace-api/http";
+import type {
+  BrowserWorkingDirectoryListResponse,
+  ListResponse,
+  Runtime,
+} from "$lib/workspace-sidebar/types";
+import type { PageLoad } from "./$types";
+
+export const load: PageLoad = async ({ fetch, params }) => {
+  const runtimeId = params.runtimeId;
+  const [runtimes, workdirs] = await Promise.all([
+    loadJson<ListResponse<Runtime>>(fetch, workspaceApiPath(params.workspaceId, "/runtimes")),
+    loadJson<BrowserWorkingDirectoryListResponse>(
+      fetch,
+      workspaceApiPath(
+        params.workspaceId,
+        `/runtimes/${encodeURIComponent(runtimeId)}/working-directories`,
+      ),
+    ),
+  ]);
+
+  return {
+    workspaceId: params.workspaceId,
+    runtimeId,
+    runtimes: runtimes.data,
+    runtimesError: runtimes.error,
+    workdirs: workdirs.data,
+    workdirsError: workdirs.error,
+  };
+};
diff --git a/web/workspace/src/routes/w/[workspaceId]/workers/+page.svelte b/web/workspace/src/routes/w/[workspaceId]/workers/+page.svelte
index 30435d19..377cbae2 100644
--- a/web/workspace/src/routes/w/[workspaceId]/workers/+page.svelte
+++ b/web/workspace/src/routes/w/[workspaceId]/workers/+page.svelte
@@ -51,7 +51,7 @@
             <th>Runtime</th>
             <th>Profile</th>
             <th>Status</th>
-            <th>Working directory</th>
+            <th>Workdir</th>
             <th>Action</th>
           </tr>
         </thead>
diff --git a/web/workspace/src/routes/w/[workspaceId]/workers/new/+page.svelte b/web/workspace/src/routes/w/[workspaceId]/workers/new/+page.svelte
index f7a0b7cb..506a2a0d 100644
--- a/web/workspace/src/routes/w/[workspaceId]/workers/new/+page.svelte
+++ b/web/workspace/src/routes/w/[workspaceId]/workers/new/+page.svelte
@@ -99,11 +99,11 @@
 
   async function createWorkingDirectory() {
     if (!runtimeId) {
-      submitError = { message: 'select a runtime before creating a working directory', diagnostics: [] };
+      submitError = { message: 'select a runtime before creating a workdir', diagnostics: [] };
       return;
     }
     if (!workingDirectoryRepositoryId) {
-      submitError = { message: 'select a repository before creating a working directory', diagnostics: [] };
+      submitError = { message: 'select a repository before creating a workdir', diagnostics: [] };
       return;
     }
     creatingWorkingDirectory = true;
@@ -122,7 +122,7 @@
         },
       );
       if (!response.ok) {
-        submitError = await responseDisplayError(response, 'working directory create failed');
+        submitError = await responseDisplayError(response, 'workdir create failed');
         return;
       }
       const payload = (await response.json()) as BrowserWorkingDirectoryCreateResponse;
@@ -138,7 +138,7 @@
         : options;
       workingDirectoryId = payload.item.working_directory_id;
     } catch (err) {
-      submitError = exceptionDisplayError(err, 'working directory create failed');
+      submitError = exceptionDisplayError(err, 'workdir create failed');
     } finally {
       creatingWorkingDirectory = false;
     }
@@ -150,7 +150,7 @@
       return;
     }
     if (isNewWorkingDirectorySelected || !workingDirectoryId) {
-      submitError = { message: 'select or create a working directory before starting a Worker', diagnostics: [] };
+      submitError = { message: 'select or create a workdir before starting a Worker', diagnostics: [] };
       return;
     }
 
@@ -220,7 +220,7 @@
   <header class="worker-new-page-header">
     <div>
       <h1 id="new-worker-heading">New Worker</h1>
-      <p>Create a Worker on a selected Runtime and working directory.</p>
+      <p>Create a Worker on a selected Runtime and workdir.</p>
     </div>
     <a class="secondary-link" href={`/w/${workspaceId}`}>Back to workspace</a>
   </header>
@@ -236,14 +236,14 @@
 
         <div class="worker-launch-sentence">
           <span>Run at</span>
-          <select class="worker-inline-select wd-select" bind:value={workingDirectoryId} aria-label="Working directory">
-            <option value="">Select working directory</option>
+          <select class="worker-inline-select wd-select" bind:value={workingDirectoryId} aria-label="Workdir">
+            <option value="">Select workdir</option>
             {#each options?.working_directories ?? [] as directory}
               <option value={directory.working_directory_id} disabled={directory.status !== 'active'}>
                 {directory.repository_id} · {directory.requested_selector ?? 'HEAD'}
               </option>
             {/each}
-            <option value={NEW_WORKING_DIRECTORY_VALUE}>New working directory…</option>
+            <option value={NEW_WORKING_DIRECTORY_VALUE}>New workdir…</option>
           </select>
           <span>in</span>
           <select class="worker-inline-select runtime-select" bind:value={runtimeId} required aria-label="Runtime">
@@ -261,7 +261,7 @@
 
         {#if isNewWorkingDirectorySelected}
           <div class="new-working-directory-panel">
-            <h3>New working directory</h3>
+            <h3>New workdir</h3>
             <div class="new-working-directory-fields">
               <label>
                 <span>Repository</span>
@@ -281,14 +281,14 @@
               </label>
             </div>
             <button type="button" disabled={creatingWorkingDirectory || !runtimeId || !workingDirectoryRepositoryId} onclick={() => void createWorkingDirectory()}>
-              {creatingWorkingDirectory ? 'Creating…' : 'Create working directory'}
+              {creatingWorkingDirectory ? 'Creating…' : 'Create workdir'}
             </button>
           </div>
         {/if}
 
         <label class="relative-cwd-field">
-          <span>Relative cwd inside WD</span>
-          <input bind:value={relativeCwd} autocomplete="off" placeholder="Optional path inside working directory" />
+          <span>Relative cwd inside workdir</span>
+          <input bind:value={relativeCwd} autocomplete="off" placeholder="Optional path inside workdir" />
         </label>
       </section>