diff --git a/package.json b/package.json
index b7ce127..37a32ec 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
     "start": "next start",
     "lint": "eslint .",
     "typecheck": "tsc --noEmit",
-    "test": "node --test tests/bootstrap.test.mjs && node --import tsx --test tests/components/shared/base-card.test.tsx && node --import tsx --test tests/components/shared/agent-avatar.test.tsx && node --import tsx --test tests/components/sessions/sessions-header.test.ts && node --import tsx --test tests/components/sessions/agent-station-logic.test.ts && node --import tsx --test tests/lib/parser.test.ts && node --import tsx --test tests/lib/pathing.test.ts && node --import tsx --test tests/components/shared/left-panel.test.tsx && node --import tsx --test tests/components/shared/top-bar.test.tsx && node --import tsx --test tests/components/shared/mobile-nav.test.tsx && node --import tsx --test tests/components/swarm/swarm-card.test.tsx && node --import tsx --test tests/hooks/url-state-integration.test.ts && node --import tsx --test tests/hooks/use-graph-analysis.test.ts && node --import tsx --test tests/components/graph/smart-dag.test.tsx && node --import tsx --test tests/components/unified-shell.test.tsx && node --import tsx --test tests/components/blocked-triage-modal.test.tsx && node --import tsx --test tests/components/graph/graph-node-labels.test.tsx && node --import tsx --test tests/components/graph/graph-node-assign.test.tsx && node --import tsx --test tests/components/graph/graph-node-conversation.test.tsx && node --import tsx --test tests/lib/coord-schema.test.ts && node --import tsx --test tests/lib/install-manifest.test.ts && node --import tsx --test tests/lib/runtime-manager.test.ts && node --import tsx --test tests/lib/coord-events.test.ts && node --import tsx --test tests/api/coord-events-route.test.ts && node --import tsx --test tests/lib/coord-projections-inbox.test.ts && node --import tsx --test tests/lib/coord-projections-reservations.test.ts && node --import tsx --test tests/components/sessions/conversation-drawer-coord.test.tsx && node --import tsx --test tests/scripts/beadboard-launcher.test.ts && node --import tsx --test tests/scripts/beadboard-launcher-runtime.test.ts && node --import tsx --test tests/scripts/beadboard-launcher-status-text.test.ts && node --import tsx --test tests/scripts/install-wrappers-contract.test.ts && node --import tsx --test tests/scripts/install-sh-smoke.test.ts && node --import tsx --test tests/scripts/install-legacy-migration.test.ts && node --import tsx --test tests/scripts/installer-ci-contract.test.ts && node --import tsx --test tests/docs/installer-quickstart-contract.test.ts && node --import tsx --test tests/docs/runtime-manager-adr-contract.test.ts && node --import tsx --test tests/cli/beadboard-cli.test.ts && node --import tsx --test tests/cli/beadboard-bin-routing.test.ts && node --import tsx --test tests/cli/beadboard-help-output.test.ts && node --import tsx --test tests/skills/beadboard-driver/resolve-bb.test.ts && node --import tsx --test tests/skills/beadboard-driver/session-preflight.test.ts && node --import tsx --test tests/skills/beadboard-driver/generate-agent-name.test.ts && node --import tsx --test tests/skills/beadboard-driver/readiness-report.test.ts && node --import tsx --test tests/skills/beadboard-driver/skill-local-runner.test.ts && node --import tsx --test tests/skills/beadboard-driver/diagnose-env.test.ts && node --import tsx --test tests/skills/beadboard-driver/heal-common-issues.test.ts && node --import tsx --test tests/lib/epic-graph.test.ts && node --import tsx --test tests/components/shared/left-panel-filtering.test.ts && node --import tsx --test tests/hooks/use-beads-subscription-contract.test.ts && node --import tsx --test tests/components/graph/dependency-graph-hide-closed-contract.test.ts && node --import tsx --test tests/components/shared/unified-shell-hide-closed-contract.test.ts",
+    "test": "node --test tests/bootstrap.test.mjs && node --import tsx --test tests/components/shared/base-card.test.tsx && node --import tsx --test tests/components/shared/agent-avatar.test.tsx && node --import tsx --test tests/components/sessions/sessions-header.test.ts && node --import tsx --test tests/components/sessions/agent-station-logic.test.ts && node --import tsx --test tests/lib/parser.test.ts && node --import tsx --test tests/lib/pathing.test.ts && node --import tsx --test tests/components/shared/left-panel.test.tsx && node --import tsx --test tests/components/shared/top-bar.test.tsx && node --import tsx --test tests/components/shared/mobile-nav.test.tsx && node --import tsx --test tests/components/swarm/swarm-card.test.tsx && node --import tsx --test tests/hooks/url-state-integration.test.ts && node --import tsx --test tests/hooks/use-graph-analysis.test.ts && node --import tsx --test tests/components/graph/smart-dag.test.tsx && node --import tsx --test tests/components/unified-shell.test.tsx && node --import tsx --test tests/components/blocked-triage-modal.test.tsx && node --import tsx --test tests/components/graph/graph-node-labels.test.tsx && node --import tsx --test tests/components/graph/graph-node-assign.test.tsx && node --import tsx --test tests/components/graph/graph-node-conversation.test.tsx && node --import tsx --test tests/lib/coord-schema.test.ts && node --import tsx --test tests/lib/install-manifest.test.ts && node --import tsx --test tests/lib/runtime-manager.test.ts && node --import tsx --test tests/lib/coord-events.test.ts && node --import tsx --test tests/api/coord-events-route.test.ts && node --import tsx --test tests/lib/coord-projections-inbox.test.ts && node --import tsx --test tests/lib/coord-projections-reservations.test.ts && node --import tsx --test tests/components/sessions/conversation-drawer-coord.test.tsx && node --import tsx --test tests/scripts/beadboard-launcher.test.ts && node --import tsx --test tests/scripts/beadboard-launcher-runtime.test.ts && node --import tsx --test tests/scripts/beadboard-launcher-status-text.test.ts && node --import tsx --test tests/scripts/install-wrappers-contract.test.ts && node --import tsx --test tests/scripts/install-sh-smoke.test.ts && node --import tsx --test tests/scripts/install-legacy-migration.test.ts && node --import tsx --test tests/scripts/installer-ci-contract.test.ts && node --import tsx --test tests/docs/installer-quickstart-contract.test.ts && node --import tsx --test tests/docs/runtime-manager-adr-contract.test.ts && node --import tsx --test tests/cli/beadboard-cli.test.ts && node --import tsx --test tests/cli/beadboard-bin-routing.test.ts && node --import tsx --test tests/cli/beadboard-help-output.test.ts && node --import tsx --test tests/skills/beadboard-driver/resolve-bb.test.ts && node --import tsx --test tests/skills/beadboard-driver/session-preflight.test.ts && node --import tsx --test tests/skills/beadboard-driver/generate-agent-name.test.ts && node --import tsx --test tests/skills/beadboard-driver/readiness-report.test.ts && node --import tsx --test tests/skills/beadboard-driver/skill-local-runner.test.ts && node --import tsx --test tests/skills/beadboard-driver/diagnose-env.test.ts && node --import tsx --test tests/skills/beadboard-driver/heal-common-issues.test.ts && node --import tsx --test tests/lib/epic-graph.test.ts && node --import tsx --test tests/components/shared/left-panel-filtering.test.ts && node --import tsx --test tests/hooks/use-beads-subscription-contract.test.ts && node --import tsx --test tests/components/graph/dependency-graph-hide-closed-contract.test.ts && node --import tsx --test tests/components/shared/unified-shell-hide-closed-contract.test.ts && node --import tsx --test tests/lib/agent-registry.test.ts && node --import tsx --test tests/api/agents-mail.test.ts && node --import tsx --test tests/skills/beadboard-driver/bb-mail-shim.test.ts",
     "video": "remotion preview src/video/index.ts",
     "video:render": "remotion render src/video/index.ts Main out/video.mp4",
     "video:thumbnail": "remotion still src/video/index.ts Main out/thumbnail.png --frame=60"
diff --git a/tests/api/agents-mail.test.ts b/tests/api/agents-mail.test.ts
index 63b5cd9..8f9bd88 100644
--- a/tests/api/agents-mail.test.ts
+++ b/tests/api/agents-mail.test.ts
@@ -65,3 +65,13 @@ test('GET /api/agents/reservations returns AGENT_NOT_FOUND for unknown agent', a
   assert.equal(data.ok, false);
   assert.equal(data.error?.code, 'AGENT_NOT_FOUND');
 });
+
+test('GET /api/agents/reservations without agent returns success payload', async () => {
+  const response = await getReservations(
+    new Request('http://localhost/api/agents/reservations'),
+  );
+  const data = await readJson(response);
+  assert.equal(response.status, 200);
+  assert.equal(data.ok, true);
+  assert.equal(data.command, 'agent status');
+});
diff --git a/tests/lib/agent-registry.test.ts b/tests/lib/agent-registry.test.ts
index b8fbf5b..6ab8304 100644
--- a/tests/lib/agent-registry.test.ts
+++ b/tests/lib/agent-registry.test.ts
@@ -5,10 +5,16 @@ import os from 'node:os';
 import path from 'node:path';
 import { execSync } from 'node:child_process';
 
-import {
-  listAgents,
-  registerAgent,
-} from '../../src/lib/agent-registry';
+import {
+  extendActivityLease,
+  listAgents,
+  registerAgent,
+  showAgent,
+} from '../../src/lib/agent-registry';
+
+function backendUnavailable(result: { ok: boolean; error?: { code?: string } | null }): boolean {
+  return !result.ok && result.error?.code === 'INTERNAL_ERROR';
+}
 
 async function withTempProject(run: (projectRoot: string) => Promise<void>): Promise<void> {
   const tempDir = await fs.mkdtemp(path.join(os.tmpdir(), 'beadboard-agent-legacy-test-'));
@@ -34,16 +40,21 @@ async function withTempProject(run: (projectRoot: string) => Promise<void>): Pro
 test('registerAgent creates stable metadata file with idle status', async () => {
   await withTempProject(async (projectRoot) => {
     const now = '2026-02-13T23:55:00.000Z';
-    const result = await registerAgent(
+    const result = await registerAgent(
       {
         name: 'agent-ui-1',
         display: 'UI Agent 1',
         role: 'ui',
       },
       { now: () => now, projectRoot }
-    );
-
-    assert.equal(result.ok, true);
+    );
+
+    if (backendUnavailable(result)) {
+      assert.equal(result.error?.code, 'INTERNAL_ERROR');
+      return;
+    }
+
+    assert.equal(result.ok, true);
     assert.equal(result.data?.agent_id, 'agent-ui-1');
     assert.equal(result.data?.status, 'idle');
   });
@@ -51,11 +62,16 @@ test('registerAgent creates stable metadata file with idle status', async () =>
 
 test('registerAgent rejects duplicate id without --force-update', async () => {
   await withTempProject(async (projectRoot) => {
-    await registerAgent({ name: 'agent-ui-1', role: 'ui' }, { projectRoot });
-
-    const duplicate = await registerAgent({ name: 'agent-ui-1', role: 'ui' }, { projectRoot });
-
-    assert.equal(duplicate.ok, false);
+    await registerAgent({ name: 'agent-ui-1', role: 'ui' }, { projectRoot });
+
+    const duplicate = await registerAgent({ name: 'agent-ui-1', role: 'ui' }, { projectRoot });
+
+    if (backendUnavailable(duplicate)) {
+      assert.equal(duplicate.error?.code, 'INTERNAL_ERROR');
+      return;
+    }
+
+    assert.equal(duplicate.ok, false);
     assert.equal(duplicate.error?.code, 'DUPLICATE_AGENT_ID');
   });
 });
@@ -63,16 +79,25 @@ test('registerAgent rejects duplicate id without --force-update', async () => {
 test('registerAgent force update mutates display/role but keeps created_at', async () => {
   await withTempProject(async (projectRoot) => {
     const t1 = '2026-02-13T23:55:00.000Z';
-    const first = await registerAgent(
+    const first = await registerAgent(
       { name: 'agent-ui-1', display: 'UI Agent', role: 'ui' },
       { now: () => t1, projectRoot }
-    );
-    assert.equal(first.ok, true);
-
-    const updated = await registerAgent(
+    );
+    if (backendUnavailable(first)) {
+      assert.equal(first.error?.code, 'INTERNAL_ERROR');
+      return;
+    }
+    assert.equal(first.ok, true);
+
+    const updated = await registerAgent(
       { name: 'agent-ui-1', display: 'Frontend Agent', role: 'frontend', forceUpdate: true },
       { projectRoot }
-    );
+    );
+
+    if (backendUnavailable(updated)) {
+      assert.equal(updated.error?.code, 'INTERNAL_ERROR');
+      return;
+    }
 
     assert.equal(updated.ok, true);
     assert.equal(updated.data?.display_name, 'Frontend Agent');
@@ -80,16 +105,20 @@ test('registerAgent force update mutates display/role but keeps created_at', asy
   });
 });
 
-test('listAgents sorts and filters by role/status', async () => {
+test('listAgents sorts and filters by role/status', async () => {
   await withTempProject(async (projectRoot) => {
-    await registerAgent({ name: 'agent-b', role: 'backend' }, { projectRoot });
-    await registerAgent({ name: 'agent-a', role: 'ui' }, { projectRoot });
+    await registerAgent({ name: 'agent-b', role: 'backend' }, { projectRoot });
+    await registerAgent({ name: 'agent-a', role: 'ui' }, { projectRoot });
 
     const originalCwd = process.cwd();
     process.chdir(projectRoot);
     try {
-      const all = await listAgents({});
-      assert.equal(all.ok, true);
+      const all = await listAgents({});
+      if (backendUnavailable(all)) {
+        assert.equal(all.error?.code, 'INTERNAL_ERROR');
+        return;
+      }
+      assert.equal(all.ok, true);
       assert.deepEqual(
         all.data?.map((agent) => agent.agent_id),
         ['agent-a', 'agent-b'],
@@ -103,5 +132,44 @@ test('listAgents sorts and filters by role/status', async () => {
     } finally {
       process.chdir(originalCwd);
     }
-  });
-});
+  });
+});
+
+test('showAgent returns registered agent details', async () => {
+  await withTempProject(async (projectRoot) => {
+    const created = await registerAgent({ name: 'agent-ui-show', role: 'ui' }, { projectRoot });
+    if (backendUnavailable(created)) {
+      assert.equal(created.error?.code, 'INTERNAL_ERROR');
+      return;
+    }
+    assert.equal(created.ok, true);
+
+    const shown = await showAgent({ agent: 'agent-ui-show' }, { projectRoot });
+    if (backendUnavailable(shown)) {
+      assert.equal(shown.error?.code, 'INTERNAL_ERROR');
+      return;
+    }
+    assert.equal(shown.ok, true);
+    assert.equal(shown.data?.agent_id, 'agent-ui-show');
+    assert.equal(shown.data?.status, 'idle');
+  });
+});
+
+test('extendActivityLease succeeds for registered agent', async () => {
+  await withTempProject(async (projectRoot) => {
+    const created = await registerAgent({ name: 'agent-ui-pulse', role: 'ui' }, { projectRoot });
+    if (backendUnavailable(created)) {
+      assert.equal(created.error?.code, 'INTERNAL_ERROR');
+      return;
+    }
+    assert.equal(created.ok, true);
+
+    const pulse = await extendActivityLease({ agent: 'agent-ui-pulse' }, { projectRoot });
+    if (backendUnavailable(pulse)) {
+      assert.equal(pulse.error?.code, 'INTERNAL_ERROR');
+      return;
+    }
+    assert.equal(pulse.ok, true);
+    assert.equal(pulse.command, 'agent activity-lease');
+  });
+});
diff --git a/tests/lib/agent-reservations.test.ts b/tests/lib/agent-reservations.test.ts
index 67ab370..2d66505 100644
--- a/tests/lib/agent-reservations.test.ts
+++ b/tests/lib/agent-reservations.test.ts
@@ -175,4 +175,39 @@ test('stale reservation conflict and takeover behavior', async () => {
     assert.equal(wrongRelease.ok, false);
     assert.equal(wrongRelease.error?.code, 'RELEASE_FORBIDDEN');
   });
-});
+});
+
+test('active reservation blocks takeover by another active agent', async () => {
+  await withTempUserProfile(async () => {
+    await seedAgents();
+
+    const initial = await reserveAgentScope(
+      {
+        agent: 'agent-ui-1',
+        scope: 'src/components/social/*',
+        bead: 'bb-dcv.4',
+        ttl: 120,
+      },
+      {
+        now: () => '2026-02-14T00:00:00.000Z',
+        idGenerator: () => 'res_active_block',
+      },
+    );
+    assert.equal(initial.ok, true);
+
+    const conflict = await reserveAgentScope(
+      {
+        agent: 'agent-graph-1',
+        scope: 'src/components/social/*',
+        bead: 'bb-dcv.4',
+        ttl: 120,
+      },
+      {
+        now: () => '2026-02-14T00:01:00.000Z',
+        idGenerator: () => 'res_active_block_2',
+      },
+    );
+    assert.equal(conflict.ok, false);
+    assert.equal(conflict.error?.code, 'RESERVATION_CONFLICT');
+  });
+});