feat(runtime): add Cowork checkpoint drill-in

dashboards/admin-web/.env.example

@@ -21,6 +21,7 @@ NEXT_PUBLIC_GOOGLE_CLIENT_ID=
 # ── Microservice URLs (consolidated platform-service) ──
 PLATFORM_SERVICE_URL=http://localhost:4003
 ACTIONTRAIL_SERVICE_URL=http://localhost:4018
+COWORK_SERVICE_URL=http://localhost:4009
 BILLING_INTERNAL_KEY=
 
 # ── Stripe ──

dashboards/admin-web/.env.local.example

@@ -32,6 +32,7 @@ API_BASE_URL=http://localhost:8000
 
 # Microservice URLs (consolidated platform-service)
 PLATFORM_SERVICE_URL=http://localhost:4003
+COWORK_SERVICE_URL=http://localhost:4009
 BILLING_INTERNAL_KEY=<billing-internal-key>
 
 # Azure Blob Storage
@@ -41,4 +42,3 @@ AZURE_BLOB_ACCOUNT_KEY=<blob-account-key>
 
 # Perplexity AI (admin docs chatbot / RAG)
 PERPLEXITY_API_KEY=pplx-...
-

dashboards/admin-web/src/__tests__/agent-runtime.test.ts

@@ -71,6 +71,57 @@ describe('agent runtime proxy route', () => {
     );
   });
 
+  it('proxies Cowork checkpoint list requests to cowork-service', async () => {
+    mockGetCurrentUser.mockResolvedValue({ id: 'usr_admin', role: 'admin' });
+    const fetchMock = vi.fn().mockResolvedValue({
+      status: 200,
+      json: async () => ({ checkpoints: [{ checkpointId: 'ckpt_task-1' }], count: 1 }),
+    });
+    vi.stubGlobal('fetch', fetchMock);
+
+    const res = await callGet('?section=checkpoints&productId=clawcowork&limit=10');
+
+    expect(res.status).toBe(200);
+    expect(fetchMock).toHaveBeenCalledWith(
+      'http://localhost:4009/api/agent-runtime/checkpoints?limit=10',
+      expect.objectContaining({
+        method: 'GET',
+        headers: expect.objectContaining({
+          'x-user-id': 'usr_admin',
+          'x-product-id': 'clawcowork',
+        }),
+      })
+    );
+  });
+
+  it('proxies Cowork checkpoint detail requests to cowork-service', async () => {
+    mockGetCurrentUser.mockResolvedValue({ id: 'usr_admin', role: 'admin' });
+    const fetchMock = vi.fn().mockResolvedValue({
+      status: 200,
+      json: async () => ({
+        checkpoint: { checkpointId: 'ckpt_task-1' },
+        detail: { goal: 'Review the repository' },
+      }),
+    });
+    vi.stubGlobal('fetch', fetchMock);
+
+    const res = await callGet(
+      '?section=checkpoint-detail&productId=clawcowork&checkpointId=ckpt_task-1'
+    );
+
+    expect(res.status).toBe(200);
+    expect(fetchMock).toHaveBeenCalledWith(
+      'http://localhost:4009/api/agent-runtime/checkpoints/ckpt_task-1',
+      expect.objectContaining({
+        method: 'GET',
+        headers: expect.objectContaining({
+          'x-user-id': 'usr_admin',
+          'x-product-id': 'clawcowork',
+        }),
+      })
+    );
+  });
+
   it('proxies POST dispatch validation requests to platform-service', async () => {
     mockGetCurrentUser.mockResolvedValue({ id: 'usr_admin', role: 'admin' });
     const fetchMock = vi.fn().mockResolvedValue({

dashboards/admin-web/src/app/(dashboard)/agent-runtime/page.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { useCallback, useEffect, useState } from 'react';
-import { BadgeCheck, PlayCircle, RefreshCw, Send, TimerReset } from 'lucide-react';
+import { BadgeCheck, RefreshCw, Send, TimerReset } from 'lucide-react';
 import { createProxyFetch } from '@/lib/proxy-fetch';
 import { Badge } from '@/components/ui/badge';
 import { Button } from '@/components/ui/button';
@@ -34,6 +34,54 @@ type AgentRun = {
   correlationId?: string | null;
 };
 
+type AgentCheckpoint = {
+  checkpointId: string;
+  sessionId: string;
+  runId?: string | null;
+  productId: string;
+  userId: string;
+  createdAt: string;
+  statusAtCapture: string;
+  currentTaskId?: string | null;
+  checkpointArtifactId?: string | null;
+  artifactRefs: string[];
+  memoryRefs: string[];
+  approvalRefs: string[];
+  resumeToken?: string | null;
+  stateSummary: {
+    title: string;
+    summary: string;
+    lastActionAt?: string | null;
+  };
+};
+
+type AgentCheckpointDetail = {
+  checkpoint: AgentCheckpoint;
+  detail: {
+    goal: string;
+    folder?: string | null;
+    model?: string | null;
+    createdAt: string;
+    updatedAt: string;
+    completedToolCalls: number;
+    completed: boolean;
+    cancelled: boolean;
+    error?: string | null;
+    eventId?: string | null;
+    correlationId?: string | null;
+    source: {
+      observationKind: string;
+      projectionKind: string;
+    };
+    observedRefs: {
+      checkpointArtifactId?: string | null;
+      artifactRefs: string[];
+      memoryRefs: string[];
+      approvalRefs: string[];
+    };
+  };
+};
+
 const apiFetch = createProxyFetch('/api/agent-runtime');
 
 function formatDate(iso: string | null | undefined) {
@@ -49,6 +97,10 @@ function formatDate(iso: string | null | undefined) {
 export default function AgentRuntimePage() {
   const [sessions, setSessions] = useState<AgentSession[]>([]);
   const [runs, setRuns] = useState<AgentRun[]>([]);
+  const [checkpoints, setCheckpoints] = useState<AgentCheckpoint[]>([]);
+  const [selectedCheckpointId, setSelectedCheckpointId] = useState<string | null>(null);
+  const [checkpointDetail, setCheckpointDetail] = useState<AgentCheckpointDetail | null>(null);
+  const [checkpointLoading, setCheckpointLoading] = useState(false);
   const [loading, setLoading] = useState(true);
   const [userId, setUserId] = useState('');
   const [limit, setLimit] = useState('20');
@@ -83,20 +135,54 @@ export default function AgentRuntimePage() {
 
     const runParams = new URLSearchParams({ section: 'runs', limit });
 
-    const [sessionData, runData] = await Promise.all([
+    const checkpointParams = new URLSearchParams({
+      section: 'checkpoints',
+      productId: 'clawcowork',
+      limit,
+    });
+
+    const [sessionData, runData, checkpointData] = await Promise.all([
       apiFetch(`?${sessionParams.toString()}`),
       apiFetch(`?${runParams.toString()}`),
+      apiFetch(`?${checkpointParams.toString()}`),
     ]);
 
     setSessions(Array.isArray(sessionData?.sessions) ? sessionData.sessions : []);
     setRuns(Array.isArray(runData?.runs) ? runData.runs : []);
+    const nextCheckpoints = Array.isArray(checkpointData?.checkpoints)
+      ? checkpointData.checkpoints
+      : [];
+    setCheckpoints(nextCheckpoints);
+    setSelectedCheckpointId(current =>
+      nextCheckpoints.some((checkpoint: AgentCheckpoint) => checkpoint.checkpointId === current)
+        ? current
+        : (nextCheckpoints[0]?.checkpointId ?? null)
+    );
     setLoading(false);
   }, [limit, userId]);
 
+  const loadCheckpointDetail = useCallback(async (checkpointId: string | null) => {
+    if (!checkpointId) {
+      setCheckpointDetail(null);
+      return;
+    }
+
+    setCheckpointLoading(true);
+    const detail = await apiFetch(
+      `?section=checkpoint-detail&productId=clawcowork&checkpointId=${encodeURIComponent(checkpointId)}`
+    );
+    setCheckpointDetail(detail?.checkpoint ? detail : null);
+    setCheckpointLoading(false);
+  }, []);
+
   useEffect(() => {
     void loadData();
   }, [loadData]);
 
+  useEffect(() => {
+    void loadCheckpointDetail(selectedCheckpointId);
+  }, [loadCheckpointDetail, selectedCheckpointId]);
+
   async function validateDispatch() {
     try {
       const parsed = JSON.parse(dispatchPayload);
@@ -171,6 +257,16 @@ export default function AgentRuntimePage() {
             </div>
           </CardContent>
         </Card>
+        <Card>
+          <CardHeader className="pb-2">
+            <CardTitle className="text-sm font-medium text-muted-foreground">
+              Cowork Checkpoints
+            </CardTitle>
+          </CardHeader>
+          <CardContent>
+            <div className="text-2xl font-bold">{checkpoints.length}</div>
+          </CardContent>
+        </Card>
       </div>
 
       <div className="grid gap-3 md:grid-cols-3">
@@ -190,6 +286,7 @@ export default function AgentRuntimePage() {
         <TabsList>
           <TabsTrigger value="sessions">Sessions</TabsTrigger>
           <TabsTrigger value="runs">Runs</TabsTrigger>
+          <TabsTrigger value="checkpoints">Cowork Checkpoints</TabsTrigger>
           <TabsTrigger value="dispatch">Dispatch Validation</TabsTrigger>
         </TabsList>
 
@@ -296,6 +393,226 @@ export default function AgentRuntimePage() {
           </Card>
         </TabsContent>
 
+        <TabsContent value="checkpoints">
+          <div className="grid gap-4 xl:grid-cols-[1.2fr,0.8fr]">
+            <Card>
+              <CardHeader>
+                <CardTitle className="text-base">Checkpoint Summaries</CardTitle>
+              </CardHeader>
+              <CardContent className="space-y-3">
+                {loading ? (
+                  <div className="text-sm text-muted-foreground">Loading checkpoints...</div>
+                ) : checkpoints.length === 0 ? (
+                  <div className="text-sm text-muted-foreground">
+                    No Cowork checkpoints are currently available.
+                  </div>
+                ) : (
+                  checkpoints.map(checkpoint => (
+                    <button
+                      key={checkpoint.checkpointId}
+                      type="button"
+                      onClick={() => setSelectedCheckpointId(checkpoint.checkpointId)}
+                      className={`w-full rounded-lg border p-3 text-left transition ${
+                        selectedCheckpointId === checkpoint.checkpointId
+                          ? 'border-emerald-500 bg-emerald-50/60'
+                          : 'hover:bg-muted/20'
+                      }`}
+                    >
+                      <div className="mb-2 flex flex-wrap items-center gap-2">
+                        <div className="font-medium">{checkpoint.stateSummary.title}</div>
+                        <Badge variant="outline">{checkpoint.statusAtCapture}</Badge>
+                        <Badge variant="outline">clawcowork</Badge>
+                      </div>
+                      <div className="mb-3 text-sm text-muted-foreground">
+                        {checkpoint.stateSummary.summary}
+                      </div>
+                      <div className="grid gap-2 text-sm md:grid-cols-3">
+                        <div>
+                          <div className="text-xs uppercase tracking-wide text-muted-foreground">
+                            Checkpoint
+                          </div>
+                          <div className="font-mono text-xs">{checkpoint.checkpointId}</div>
+                        </div>
+                        <div>
+                          <div className="text-xs uppercase tracking-wide text-muted-foreground">
+                            Run
+                          </div>
+                          <div className="font-mono text-xs">{checkpoint.runId || '—'}</div>
+                        </div>
+                        <div>
+                          <div className="text-xs uppercase tracking-wide text-muted-foreground">
+                            Last Action
+                          </div>
+                          <div>
+                            {formatDate(
+                              checkpoint.stateSummary.lastActionAt || checkpoint.createdAt
+                            )}
+                          </div>
+                        </div>
+                      </div>
+                    </button>
+                  ))
+                )}
+              </CardContent>
+            </Card>
+
+            <Card>
+              <CardHeader>
+                <CardTitle className="text-base">Checkpoint Drill-In</CardTitle>
+              </CardHeader>
+              <CardContent className="space-y-4">
+                {checkpointLoading ? (
+                  <div className="text-sm text-muted-foreground">Loading checkpoint detail...</div>
+                ) : !checkpointDetail ? (
+                  <div className="text-sm text-muted-foreground">
+                    Select a checkpoint to inspect direct Cowork observations and projected runtime
+                    summary fields.
+                  </div>
+                ) : (
+                  <>
+                    <div className="rounded-lg border bg-muted/20 p-3">
+                      <div className="mb-2 flex flex-wrap items-center gap-2">
+                        <Badge className="bg-sky-50 text-sky-700 border-0">
+                          direct observation
+                        </Badge>
+                        <Badge variant="outline">
+                          {checkpointDetail.detail.source.observationKind}
+                        </Badge>
+                      </div>
+                      <div className="grid gap-3 text-sm md:grid-cols-2">
+                        <div>
+                          <div className="text-xs uppercase tracking-wide text-muted-foreground">
+                            Goal
+                          </div>
+                          <div>{checkpointDetail.detail.goal}</div>
+                        </div>
+                        <div>
+                          <div className="text-xs uppercase tracking-wide text-muted-foreground">
+                            Model
+                          </div>
+                          <div>{checkpointDetail.detail.model || '—'}</div>
+                        </div>
+                        <div>
+                          <div className="text-xs uppercase tracking-wide text-muted-foreground">
+                            Folder
+                          </div>
+                          <div className="font-mono text-xs">
+                            {checkpointDetail.detail.folder || '—'}
+                          </div>
+                        </div>
+                        <div>
+                          <div className="text-xs uppercase tracking-wide text-muted-foreground">
+                            Tool Calls
+                          </div>
+                          <div>{checkpointDetail.detail.completedToolCalls}</div>
+                        </div>
+                        <div>
+                          <div className="text-xs uppercase tracking-wide text-muted-foreground">
+                            Event ID
+                          </div>
+                          <div className="font-mono text-xs">
+                            {checkpointDetail.detail.eventId || '—'}
+                          </div>
+                        </div>
+                        <div>
+                          <div className="text-xs uppercase tracking-wide text-muted-foreground">
+                            Correlation
+                          </div>
+                          <div className="font-mono text-xs">
+                            {checkpointDetail.detail.correlationId || '—'}
+                          </div>
+                        </div>
+                      </div>
+                    </div>
+
+                    <div className="rounded-lg border bg-muted/20 p-3">
+                      <div className="mb-2 flex flex-wrap items-center gap-2">
+                        <Badge className="bg-emerald-50 text-emerald-700 border-0">
+                          projected summary
+                        </Badge>
+                        <Badge variant="outline">
+                          {checkpointDetail.detail.source.projectionKind}
+                        </Badge>
+                      </div>
+                      <div className="space-y-2 text-sm">
+                        <div>
+                          <div className="text-xs uppercase tracking-wide text-muted-foreground">
+                            Summary
+                          </div>
+                          <div>{checkpointDetail.checkpoint.stateSummary.summary}</div>
+                        </div>
+                        <div className="grid gap-3 md:grid-cols-2">
+                          <div>
+                            <div className="text-xs uppercase tracking-wide text-muted-foreground">
+                              Resume Token
+                            </div>
+                            <div className="font-mono text-xs">
+                              {checkpointDetail.checkpoint.resumeToken || '—'}
+                            </div>
+                          </div>
+                          <div>
+                            <div className="text-xs uppercase tracking-wide text-muted-foreground">
+                              Checkpoint Artifact
+                            </div>
+                            <div className="font-mono text-xs">
+                              {checkpointDetail.detail.observedRefs.checkpointArtifactId || '—'}
+                            </div>
+                          </div>
+                        </div>
+                      </div>
+                    </div>
+
+                    <div className="grid gap-3 md:grid-cols-3">
+                      <div className="rounded-lg border p-3">
+                        <div className="mb-2 text-xs uppercase tracking-wide text-muted-foreground">
+                          Artifact Refs
+                        </div>
+                        <div className="space-y-2 text-xs">
+                          {checkpointDetail.detail.observedRefs.artifactRefs.length > 0
+                            ? checkpointDetail.detail.observedRefs.artifactRefs.map(ref => (
+                                <div key={ref} className="font-mono">
+                                  {ref}
+                                </div>
+                              ))
+                            : '—'}
+                        </div>
+                      </div>
+                      <div className="rounded-lg border p-3">
+                        <div className="mb-2 text-xs uppercase tracking-wide text-muted-foreground">
+                          Memory Refs
+                        </div>
+                        <div className="space-y-2 text-xs">
+                          {checkpointDetail.detail.observedRefs.memoryRefs.length > 0
+                            ? checkpointDetail.detail.observedRefs.memoryRefs.map(ref => (
+                                <div key={ref} className="font-mono">
+                                  {ref}
+                                </div>
+                              ))
+                            : '—'}
+                        </div>
+                      </div>
+                      <div className="rounded-lg border p-3">
+                        <div className="mb-2 text-xs uppercase tracking-wide text-muted-foreground">
+                          Approval Refs
+                        </div>
+                        <div className="space-y-2 text-xs">
+                          {checkpointDetail.detail.observedRefs.approvalRefs.length > 0
+                            ? checkpointDetail.detail.observedRefs.approvalRefs.map(ref => (
+                                <div key={ref} className="font-mono">
+                                  {ref}
+                                </div>
+                              ))
+                            : '—'}
+                        </div>
+                      </div>
+                    </div>
+                  </>
+                )}
+              </CardContent>
+            </Card>
+          </div>
+        </TabsContent>
+
         <TabsContent value="dispatch">
           <Card>
             <CardHeader>

dashboards/admin-web/src/app/api/agent-runtime/route.ts

@@ -3,6 +3,7 @@ import { getCurrentUserFromRequest } from '@/lib/auth-server';
 import { logError } from '@/lib/logger';
 
 const PLATFORM_URL = process.env.PLATFORM_SERVICE_URL || 'http://localhost:4003';
+const COWORK_SERVICE_URL = process.env.COWORK_SERVICE_URL || 'http://localhost:4009';
 
 function buildHeaders(req: NextRequest, callerId: string): Record<string, string> {
   return {
@@ -20,17 +21,37 @@ export async function GET(req: NextRequest) {
 
     const url = new URL(req.url);
     const section = url.searchParams.get('section') ?? 'sessions';
+    const productOverride = url.searchParams.get('productId')?.trim() || null;
     const qs = new URLSearchParams(url.searchParams);
     qs.delete('section');
+    qs.delete('productId');
     const suffix = qs.toString() ? `?${qs.toString()}` : '';
-    const targetPath =
+    const targetProductId =
-      section === 'runs'
+      productOverride || req.headers.get('x-product-id') || process.env.PRODUCT_ID || 'lysnrai';
-        ? `/api/agent-runtime/runs${suffix}`
+    const isCowork = targetProductId === 'clawcowork';
-        : `/api/agent-runtime/sessions${suffix}`;
 
-    const res = await fetch(`${PLATFORM_URL}${targetPath}`, {
+    let targetBaseUrl = PLATFORM_URL;
+    let targetPath = `/api/agent-runtime/sessions${suffix}`;
+    if (section === 'runs') {
+      targetPath = `/api/agent-runtime/runs${suffix}`;
+    } else if (isCowork && section === 'checkpoints') {
+      targetBaseUrl = COWORK_SERVICE_URL;
+      targetPath = `/api/agent-runtime/checkpoints${suffix}`;
+    } else if (isCowork && section === 'checkpoint-detail') {
+      const checkpointId = url.searchParams.get('checkpointId')?.trim();
+      if (!checkpointId) {
+        return NextResponse.json({ error: 'checkpointId is required' }, { status: 400 });
+      }
+      targetBaseUrl = COWORK_SERVICE_URL;
+      targetPath = `/api/agent-runtime/checkpoints/${encodeURIComponent(checkpointId)}`;
+    }
+
+    const res = await fetch(`${targetBaseUrl}${targetPath}`, {
       method: 'GET',
-      headers: buildHeaders(req, caller.id),
+      headers: {
+        ...buildHeaders(req, caller.id),
+        'x-product-id': targetProductId,
+      },
     });
 
     const data = await res.json().catch(() => null);

docs/ecosystem/ECOSYSTEM_IMPLEMENTATION_TRACKER.md

@@ -41,8 +41,8 @@ Build a shared ByteLyst ecosystem layer so products do not behave like isolated
 
 ### What Remains In The Roadmap
 
-- optional product expansion, not baseline blockers:
+- no remaining mandatory roadmap items
-  - richer Cowork checkpoint drill-in if product usage justifies it
+- optional future product expansion may continue if real usage justifies it
 
 Canonical backlog:
 
@@ -52,7 +52,8 @@ Canonical backlog:
 
 - the implementation roadmap baseline is materially complete through Phase 5
 - the requested documentation hardening pass is complete
-- the remaining work is optional product expansion, not missing core baseline functionality
+- the currently tracked optional product enhancements are complete
+- any next work is net-new product expansion, not unfinished roadmap delivery
 
 ### Remaining Work Buckets
 
@@ -106,11 +107,12 @@ Canonical backlog:
   - `learning_ai_flowmonk`
     Notes:
   - safe replay preview and guarded replay execution now exist for deterministic runtime actions
-- [ ] evaluate richer Cowork checkpoint drill-in
+- [x] evaluate richer Cowork checkpoint drill-in
       Owner:
   - `oss/learning_ai_claw-cowork`
+  - `learning_ai_common_plat`
     Notes:
-  - current checkpoint summaries and refs are sufficient for the baseline; richer drill-in is optional product expansion
+  - `cowork-service` now exposes one-checkpoint drill-in and the hosted admin runtime console now distinguishes direct checkpoint observations from projected summary fields
 
 ---
 

docs/ecosystem/OPTIONAL_PRODUCT_ENHANCEMENT_BACKLOG.md

@@ -89,6 +89,8 @@ Execution controls add complexity and should only be introduced if the review-on
 
 ### 2.2 Cowork richer checkpoint drill-in
 
+> **Status:** implemented
+
 > **Priority:** `medium`
 > **Owner repo:** `oss/learning_ai_claw-cowork`
 > **Type:** optional product enhancement
@@ -129,11 +131,11 @@ Richer drill-in is useful for power-user inspection, but not required to keep th
 
 #### Acceptance criteria
 
-- [ ] checkpoint drill-in shows meaningful incremental state beyond the summary row
+- [x] checkpoint drill-in shows meaningful incremental state beyond the summary row
-- [ ] linked artifact and memory refs can be opened or traced cleanly
+- [x] linked artifact and memory refs can be opened or traced cleanly
-- [ ] session/task context remains clear throughout drill-in
+- [x] session/task context remains clear throughout drill-in
-- [ ] the UI clearly distinguishes direct observations from projected summaries
+- [x] the UI clearly distinguishes direct observations from projected summaries
-- [ ] Rust and service-level tests cover the richer checkpoint shape
+- [x] Rust and service-level tests cover the richer checkpoint shape
 
 #### Risks
 
@@ -141,6 +143,18 @@ Richer drill-in is useful for power-user inspection, but not required to keep th
 - drill-in UI can expose implementation detail without user value
 - replay/resume affordances may be confused with guaranteed deterministic restoration
 
+#### Implementation notes
+
+- `cowork-service` now exposes a checkpoint-detail route for one persisted Cowork checkpoint
+- the hosted admin runtime console now includes a dedicated Cowork checkpoint tab with drill-in detail
+- the drill-in explicitly separates persisted Cowork observations from projected runtime summary fields
+- checkpoint-linked artifact, memory, and approval refs are surfaced directly in the review panel
+
+#### Commits
+
+- `7240de7` added direct checkpoint artifact IDs to Cowork runtime IPC
+- `59ae0e1` added the shared checkpoint artifact contract and projection mapping
+
 ---
 
 ## 3. Priority Guidance

docs/ecosystem/adoption/learning_ai_claw-cowork.md

@@ -2,7 +2,7 @@
 
 > **Repo:** `oss/learning_ai_claw-cowork`
 > **Ecosystem focus:** audited artifact producer for Phase 3
-> **Status:** existing producer surface reused
+> **Status:** runtime and checkpoint drill-in adopted
 
 ---
 
@@ -45,6 +45,8 @@ Current runtime adoption state:
 - approvals and action logs can participate in ActionTrail replay
 - persisted checkpoint records now back runtime todo review and runtime checkpoint summaries
 - checkpoint summaries now preserve artifact, memory, and approval refs when Cowork provides them
+- hosted admin runtime review now supports Cowork-specific checkpoint drill-in
+- checkpoint drill-in now separates direct persisted Cowork observations from projected runtime summary fields
 - session and task IPC projections now expose canonical event IDs directly
 - the shared runtime contract now explicitly documents which Cowork states are direct Rust observations versus `cowork-service` projections
 

services/cowork-service/src/modules/agent-runtime/routes.test.ts

@@ -261,6 +261,74 @@ describe('agent runtime routes', () => {
     });
   });
 
+  it('returns richer checkpoint drill-in detail for one persisted checkpoint', async () => {
+    call
+      .mockResolvedValueOnce({
+        result: {
+          tasks: [
+            {
+              id: 'task-1',
+              goal: 'Review the repository and summarize changes',
+              status: 'running',
+              createdAt: '2026-04-04T08:00:00.000Z',
+              updatedAt: '2026-04-04T08:10:00.000Z',
+              sessionId: 'sess-1',
+            },
+          ],
+        },
+      })
+      .mockResolvedValueOnce({
+        result: {
+          checkpoints: [
+            {
+              task_id: 'task-1',
+              user_id: 'demo-user',
+              goal: 'Review the repository and summarize changes',
+              folder: '/tmp/workspace',
+              model: 'gpt-5.4',
+              created_at: '2026-04-04T08:00:00.000Z',
+              last_updated: '2026-04-04T08:10:00.000Z',
+              completed: false,
+              cancelled: false,
+              completed_tool_calls: 2,
+              checkpoint_artifact_id: 'artifact://notelett/note-1',
+              artifact_refs: ['artifact://notelett/note-1'],
+              memory_refs: ['memory://mindlyst/memory-1'],
+              approval_refs: ['approval://cowork/ap-1'],
+              event_id: 'evt_cowork_task_task-1',
+              correlation_id: 'evt_cowork_task_task-1',
+              error: null,
+            },
+          ],
+        },
+      });
+
+    const res = await app.inject({
+      method: 'GET',
+      url: '/api/agent-runtime/checkpoints/ckpt_task-1',
+    });
+    expect(res.statusCode).toBe(200);
+    const body = JSON.parse(res.payload);
+    expect(body.checkpoint).toMatchObject({
+      checkpointId: 'ckpt_task-1',
+      runId: 'task-1',
+      sessionId: 'sess-1',
+      checkpointArtifactId: 'artifact://notelett/note-1',
+    });
+    expect(body.detail).toMatchObject({
+      goal: 'Review the repository and summarize changes',
+      folder: '/tmp/workspace',
+      model: 'gpt-5.4',
+      completedToolCalls: 2,
+      eventId: 'evt_cowork_task_task-1',
+      correlationId: 'evt_cowork_task_task-1',
+      source: {
+        observationKind: 'persisted-checkpoint',
+        projectionKind: 'agent-runtime-summary',
+      },
+    });
+  });
+
   it('projects approval audit records into AgentApprovalCheckpoint objects', async () => {
     mockFetch
       .mockResolvedValueOnce({

services/cowork-service/src/modules/agent-runtime/routes.ts

@@ -16,7 +16,7 @@ import {
   type AgentTask,
   type AgentTodo,
 } from '@bytelyst/events';
-import { BadRequestError } from '@bytelyst/errors';
+import { BadRequestError, NotFoundError } from '@bytelyst/errors';
 import { config } from '../../lib/config.js';
 import { getIpcBridge } from '../../lib/ipc-bridge.js';
 import { PRODUCT_ID } from '../../lib/product-config.js';
@@ -38,6 +38,16 @@ function asIsoString(value: unknown, fallback: string): string {
   return fallback;
 }
 
+function stringList(value: unknown): string[] {
+  return Array.isArray(value)
+    ? value.filter((entry): entry is string => typeof entry === 'string')
+    : [];
+}
+
+function checkpointTaskIdFromId(checkpointId: string): string {
+  return checkpointId.startsWith('ckpt_') ? checkpointId.slice(5) : checkpointId;
+}
+
 function mapTaskStatus(status: unknown): AgentRun['status'] {
   switch (status) {
     case 'pending':
@@ -79,15 +89,9 @@ function toAgentSession(session: Record<string, unknown>, fallbackNow: string):
       typeof session.currentTaskId === 'string' && session.currentTaskId.length > 0
         ? session.currentTaskId
         : null,
-    memoryRefs: Array.isArray(session.memoryRefs)
+    memoryRefs: stringList(session.memoryRefs),
-      ? session.memoryRefs.filter((value): value is string => typeof value === 'string')
+    artifactRefs: stringList(session.artifactRefs),
-      : [],
+    approvalRefs: stringList(session.approvalRefs),
-    artifactRefs: Array.isArray(session.artifactRefs)
-      ? session.artifactRefs.filter((value): value is string => typeof value === 'string')
-      : [],
-    approvalRefs: Array.isArray(session.approvalRefs)
-      ? session.approvalRefs.filter((value): value is string => typeof value === 'string')
-      : [],
     dispatchContext: {
       originSurface: 'desktop',
       originProductId: PRODUCT_ID,
@@ -279,9 +283,7 @@ function toAgentCheckpoint(
           : 'checkpoint available for resume',
   ].join('; ');
 
-  const artifactRefs = Array.isArray(checkpoint.artifact_refs)
+  const artifactRefs = stringList(checkpoint.artifact_refs);
-    ? checkpoint.artifact_refs.filter((value): value is string => typeof value === 'string')
-    : [];
   const checkpointArtifactId =
     typeof checkpoint.checkpoint_artifact_id === 'string' &&
     checkpoint.checkpoint_artifact_id.length > 0
@@ -304,12 +306,8 @@ function toAgentCheckpoint(
     checkpointArtifactId,
     todoIds: [`todo_${taskId}`],
     artifactRefs,
-    memoryRefs: Array.isArray(checkpoint.memory_refs)
+    memoryRefs: stringList(checkpoint.memory_refs),
-      ? checkpoint.memory_refs.filter((value): value is string => typeof value === 'string')
+    approvalRefs: stringList(checkpoint.approval_refs),
-      : [],
-    approvalRefs: Array.isArray(checkpoint.approval_refs)
-      ? checkpoint.approval_refs.filter((value): value is string => typeof value === 'string')
-      : [],
     dispatchContext: {
       originSurface: 'desktop',
       originProductId: PRODUCT_ID,
@@ -325,6 +323,62 @@ function toAgentCheckpoint(
   });
 }
 
+function toCheckpointDetail(
+  task: Record<string, unknown> | null,
+  checkpoint: Record<string, unknown>,
+  fallbackNow: string
+) {
+  const projected = toAgentCheckpoint(task, checkpoint, fallbackNow);
+  return {
+    checkpoint: projected,
+    detail: {
+      goal:
+        typeof checkpoint.goal === 'string' && checkpoint.goal.trim().length > 0
+          ? checkpoint.goal.trim()
+          : projected.stateSummary.title,
+      folder:
+        typeof checkpoint.folder === 'string' && checkpoint.folder.length > 0
+          ? checkpoint.folder
+          : null,
+      model:
+        typeof checkpoint.model === 'string' && checkpoint.model.length > 0
+          ? checkpoint.model
+          : null,
+      createdAt: asIsoString(checkpoint.created_at, projected.createdAt),
+      updatedAt: asIsoString(
+        checkpoint.last_updated,
+        projected.stateSummary.lastActionAt ?? projected.createdAt
+      ),
+      completedToolCalls:
+        typeof checkpoint.completed_tool_calls === 'number' ? checkpoint.completed_tool_calls : 0,
+      completed: checkpoint.completed === true,
+      cancelled: checkpoint.cancelled === true,
+      error:
+        typeof checkpoint.error === 'string' && checkpoint.error.length > 0
+          ? checkpoint.error
+          : null,
+      eventId:
+        typeof checkpoint.event_id === 'string' && checkpoint.event_id.length > 0
+          ? checkpoint.event_id
+          : null,
+      correlationId:
+        typeof checkpoint.correlation_id === 'string' && checkpoint.correlation_id.length > 0
+          ? checkpoint.correlation_id
+          : null,
+      source: {
+        observationKind: 'persisted-checkpoint',
+        projectionKind: 'agent-runtime-summary',
+      },
+      observedRefs: {
+        checkpointArtifactId: projected.checkpointArtifactId ?? null,
+        artifactRefs: projected.artifactRefs,
+        memoryRefs: projected.memoryRefs,
+        approvalRefs: projected.approvalRefs,
+      },
+    },
+  };
+}
+
 function mapApprovalStatus(action: unknown): AgentApprovalCheckpoint['status'] {
   switch (action) {
     case 'approval_granted':
@@ -641,6 +695,34 @@ export async function agentRuntimeRoutes(app: FastifyInstance) {
     };
   });
 
+  app.get('/api/agent-runtime/checkpoints/:checkpointId', async req => {
+    if (!bridge.isRunning) {
+      throw new NotFoundError('Checkpoint not found');
+    }
+
+    const checkpointId = checkpointTaskIdFromId(
+      (req.params as { checkpointId: string }).checkpointId ?? ''
+    );
+    if (!checkpointId) {
+      throw new BadRequestError('checkpointId is required');
+    }
+
+    const [rawTasks, checkpoints] = await Promise.all([fetchTasks(req), fetchCheckpoints(req)]);
+    const rawCheckpoint = checkpoints.find(
+      checkpoint => typeof checkpoint.task_id === 'string' && checkpoint.task_id === checkpointId
+    );
+    if (!rawCheckpoint) {
+      throw new NotFoundError('Checkpoint not found');
+    }
+
+    const task =
+      rawTasks.find(rawTask => typeof rawTask.id === 'string' && rawTask.id === checkpointId) ??
+      null;
+    const now = new Date().toISOString();
+
+    return toCheckpointDetail(task, rawCheckpoint, now);
+  });
+
   app.get('/api/agent-runtime/approvals', async req => {
     const records = await fetchApprovalRecords(req);
     const now = new Date().toISOString();