diff --git a/canvas/src/components/mobile/__tests__/MobileChat.test.tsx b/canvas/src/components/mobile/__tests__/MobileChat.test.tsx
new file mode 100644
index 00000000..9b89df4c
--- /dev/null
+++ b/canvas/src/components/mobile/__tests__/MobileChat.test.tsx
@@ -0,0 +1,323 @@
+// @vitest-environment jsdom
+/**
+ * MobileChat — mobile message thread + composer + sub-tabs.
+ *
+ * Per spec §04: wired to /workspaces/:id/a2a (method message/send).
+ * Slimmer surface than desktop ChatTab: no attachments, no topology overlay.
+ *
+ * NOTE: No @testing-library/jest-dom — use DOM APIs.
+ */
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { cleanup, render } from "@testing-library/react";
+import React from "react";
+
+import { MobileChat } from "../MobileChat";
+
+// ─── Mock store ───────────────────────────────────────────────────────────────
+
+const mockAgentId = "ws-chat-test";
+const mockOnBack = vi.fn();
+
+// Module-level mutable state for the mock store.
+const mockStoreState = {
+  nodes: [] as Array<{
+    id: string;
+    position: { x: number; y: number };
+    data: Record<string, unknown>;
+    width?: number;
+    height?: number;
+  }>,
+  agentMessages: {} as Record<string, Array<{ id: string; content: string; timestamp: string }>>,
+};
+
+vi.mock("@/store/canvas", () => ({
+  useCanvasStore: Object.assign(
+    vi.fn((sel) => sel(mockStoreState)),
+    { getState: () => mockStoreState },
+  ),
+  summarizeWorkspaceCapabilities: vi.fn((data: Record<string, unknown>) => {
+    const agentCard = data.agentCard as Record<string, unknown> | null;
+    const skills = Array.isArray(agentCard?.skills)
+      ? (agentCard.skills as Array<Record<string, unknown>>).map(
+          (s) => String(s.name || s.id || ""),
+        ).filter(Boolean)
+      : [];
+    return {
+      runtime: (typeof data.runtime === "string" && data.runtime)
+        ? data.runtime
+        : (typeof agentCard?.runtime === "string" ? String(agentCard.runtime) : null),
+      skills,
+      skillCount: skills.length,
+      currentTask: String(data.currentTask ?? ""),
+      hasActiveTask: String(data.currentTask ?? "").trim().length > 0,
+    };
+  }),
+}));
+
+// ─── Mock API ─────────────────────────────────────────────────────────────────
+
+const { mockApiPost } = vi.hoisted(() => ({
+  mockApiPost: vi.fn().mockResolvedValue({ result: { parts: [] } }),
+}));
+
+vi.mock("@/lib/api", () => ({
+  api: { post: mockApiPost },
+}));
+
+// ─── Fixtures ────────────────────────────────────────────────────────────────
+
+const onlineNode = {
+  id: mockAgentId,
+  position: { x: 0, y: 0 },
+  data: {
+    name: "Chat Agent",
+    status: "online",
+    tier: 2,
+    agentCard: {
+      runtime: "claude-code",
+      skills: [{ name: "web-search" }],
+    },
+    currentTask: "",
+    activeTasks: 0,
+    collapsed: false,
+    role: "agent",
+    lastErrorRate: 0,
+    lastSampleError: "",
+    url: "",
+    parentId: null,
+    runtime: "claude-code",
+    needsRestart: false,
+  },
+};
+
+const offlineNode = {
+  id: "ws-offline",
+  position: { x: 0, y: 0 },
+  data: {
+    name: "Offline Agent",
+    status: "offline",
+    tier: 1,
+    agentCard: null,
+    currentTask: "",
+    activeTasks: 0,
+    collapsed: false,
+    role: "agent",
+    lastErrorRate: 0,
+    lastSampleError: "",
+    url: "",
+    parentId: null,
+    runtime: "claude-code",
+    needsRestart: false,
+  },
+};
+
+const degradedNode = {
+  id: "ws-degraded",
+  position: { x: 0, y: 0 },
+  data: {
+    name: "Degraded Agent",
+    status: "degraded",
+    tier: 3,
+    agentCard: null,
+    currentTask: "",
+    activeTasks: 0,
+    collapsed: false,
+    role: "agent",
+    lastErrorRate: 0,
+    lastSampleError: "",
+    url: "",
+    parentId: null,
+    runtime: "claude-code",
+    needsRestart: false,
+  },
+};
+
+// ─── Helpers ─────────────────────────────────────────────────────────────────
+
+function renderChat(agentId: string, dark = false) {
+  return render(
+    <MobileChat
+      agentId={agentId}
+      dark={dark}
+      onBack={mockOnBack}
+    />,
+  );
+}
+
+// ─── Setup / teardown ─────────────────────────────────────────────────────────
+
+beforeEach(() => {
+  mockOnBack.mockClear();
+  mockStoreState.nodes = [];
+  mockStoreState.agentMessages = {};
+  mockApiPost.mockClear();
+});
+
+afterEach(() => {
+  cleanup();
+  vi.clearAllMocks();
+});
+
+// ─── Not found ───────────────────────────────────────────────────────────────
+
+describe("MobileChat — agent not found", () => {
+  it('renders "Agent not found." when node is absent', () => {
+    mockStoreState.nodes = [onlineNode];
+    const { container } = renderChat("nonexistent-id");
+    expect(container.textContent ?? "").toContain("Agent not found.");
+  });
+});
+
+// ─── Header ──────────────────────────────────────────────────────────────────
+
+describe("MobileChat — header", () => {
+  beforeEach(() => {
+    mockStoreState.nodes = [onlineNode];
+  });
+
+  it("renders Back button with aria-label", () => {
+    const { container } = renderChat(mockAgentId);
+    const backBtn = container.querySelector('[aria-label="Back"]');
+    expect(backBtn).toBeTruthy();
+  });
+
+  it("Back button calls onBack", () => {
+    const { container } = renderChat(mockAgentId);
+    const backBtn = container.querySelector('[aria-label="Back"]') as HTMLButtonElement;
+    backBtn.click();
+    expect(mockOnBack).toHaveBeenCalledTimes(1);
+  });
+
+  it("renders agent name in header", () => {
+    const { container } = renderChat(mockAgentId);
+    expect(container.textContent ?? "").toContain("Chat Agent");
+  });
+
+  it("renders a More button", () => {
+    const { container } = renderChat(mockAgentId);
+    const moreBtn = container.querySelector('[aria-label="More"]');
+    expect(moreBtn).toBeTruthy();
+  });
+
+  it("renders footer with agentId", () => {
+    const { container } = renderChat(mockAgentId);
+    expect(container.textContent ?? "").toContain(mockAgentId);
+  });
+});
+
+// ─── Composer ────────────────────────────────────────────────────────────────
+
+describe("MobileChat — composer", () => {
+  beforeEach(() => {
+    mockStoreState.nodes = [onlineNode];
+  });
+
+  it("renders a textarea for message input", () => {
+    const { container } = renderChat(mockAgentId);
+    const textarea = container.querySelector("textarea");
+    expect(textarea).toBeTruthy();
+  });
+
+  it("textarea has placeholder text", () => {
+    const { container } = renderChat(mockAgentId);
+    const textarea = container.querySelector("textarea") as HTMLTextAreaElement;
+    expect(textarea.placeholder).toBeTruthy();
+    expect(textarea.placeholder).toContain("Send a message");
+  });
+
+  it("renders a Send button with aria-label", () => {
+    const { container } = renderChat(mockAgentId);
+    const sendBtn = container.querySelector('[aria-label="Send"]');
+    expect(sendBtn).toBeTruthy();
+  });
+
+  it("Send button is disabled when textarea is empty (no draft)", () => {
+    const { container } = renderChat(mockAgentId);
+    const sendBtn = container.querySelector('[aria-label="Send"]') as HTMLButtonElement;
+    expect(sendBtn.disabled).toBe(true);
+  });
+});
+
+// ─── Tabs ─────────────────────────────────────────────────────────────────────
+
+describe("MobileChat — tabs", () => {
+  beforeEach(() => {
+    mockStoreState.nodes = [onlineNode];
+  });
+
+  it("renders My Chat and Agent Comms tab labels", () => {
+    const { container } = renderChat(mockAgentId);
+    const text = container.textContent ?? "";
+    expect(text).toContain("My Chat");
+    expect(text).toContain("Agent Comms");
+  });
+
+  it("defaults to My Chat tab", () => {
+    const { container } = renderChat(mockAgentId);
+    // My Chat is the default; if there are no messages it should show the empty state
+    expect(container.textContent ?? "").toContain("My Chat");
+  });
+});
+
+// ─── Empty state ─────────────────────────────────────────────────────────────
+
+describe("MobileChat — empty state", () => {
+  beforeEach(() => {
+    mockStoreState.nodes = [onlineNode];
+  });
+
+  it('shows "Send a message to start chatting." when no messages', () => {
+    const { container } = renderChat(mockAgentId);
+    expect(container.textContent ?? "").toContain("Send a message to start chatting.");
+  });
+
+  it("shows no messages when agentMessages[agentId] is absent (undefined)", () => {
+    // Explicitly set to empty to simulate no stored messages
+    mockStoreState.agentMessages = {};
+    const { container } = renderChat(mockAgentId);
+    expect(container.textContent ?? "").toContain("Send a message to start chatting.");
+  });
+});
+
+// ─── Agent status ────────────────────────────────────────────────────────────
+
+describe("MobileChat — agent status", () => {
+  it("renders composer for online agent", () => {
+    mockStoreState.nodes = [onlineNode];
+    const { container } = renderChat(mockAgentId);
+    expect(container.querySelector("textarea")).toBeTruthy();
+  });
+
+  it("renders composer for offline agent (with status text)", () => {
+    mockStoreState.nodes = [offlineNode];
+    const { container } = renderChat("ws-offline");
+    const textarea = container.querySelector("textarea") as HTMLTextAreaElement;
+    // Offline agent: textarea should be disabled
+    expect(textarea.disabled).toBe(true);
+  });
+
+  it("renders composer for degraded agent", () => {
+    mockStoreState.nodes = [degradedNode];
+    const { container } = renderChat("ws-degraded");
+    expect(container.querySelector("textarea")).toBeTruthy();
+  });
+
+  it("offline agent shows agent name", () => {
+    mockStoreState.nodes = [offlineNode];
+    const { container } = renderChat("ws-offline");
+    expect(container.textContent ?? "").toContain("Offline Agent");
+  });
+});
+
+// ─── Dark mode ───────────────────────────────────────────────────────────────
+
+describe("MobileChat — dark mode", () => {
+  beforeEach(() => {
+    mockStoreState.nodes = [onlineNode];
+  });
+
+  it("renders without crashing in dark mode", () => {
+    const { container } = renderChat(mockAgentId, true);
+    expect(container.querySelector('[aria-label="Back"]')).toBeTruthy();
+  });
+});
diff --git a/canvas/src/components/mobile/__tests__/MobileDetail.test.tsx b/canvas/src/components/mobile/__tests__/MobileDetail.test.tsx
new file mode 100644
index 00000000..3fac2344
--- /dev/null
+++ b/canvas/src/components/mobile/__tests__/MobileDetail.test.tsx
@@ -0,0 +1,367 @@
+// @vitest-environment jsdom
+/**
+ * MobileDetail — agent detail page with tabbed content (Overview/Activity/Config/Memory).
+ *
+ * Per spec §03: tabbed agent detail page. MobileChat (MR !717) was also tested here.
+ *
+ * NOTE: No @testing-library/jest-dom — use DOM APIs.
+ */
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { cleanup, render } from "@testing-library/react";
+import React from "react";
+
+import { MobileDetail } from "../MobileDetail";
+
+// ─── Mock store ───────────────────────────────────────────────────────────────
+
+const mockNodeId = "ws-detail-test";
+const mockOnBack = vi.fn();
+const mockOnChat = vi.fn();
+
+// Module-level mutable state for the mock store.
+// Tests mutate this between cases to control what the component sees.
+const mockStoreState = {
+  nodes: [] as Array<{
+    id: string;
+    position: { x: number; y: number };
+    data: Record<string, unknown>;
+    width?: number;
+    height?: number;
+  }>,
+};
+
+vi.mock("@/store/canvas", () => ({
+  useCanvasStore: Object.assign(
+    vi.fn((sel) => sel(mockStoreState)),
+    { getState: () => mockStoreState },
+  ),
+  summarizeWorkspaceCapabilities: vi.fn((data: Record<string, unknown>) => {
+    const agentCard = data.agentCard as Record<string, unknown> | null;
+    const skills = Array.isArray(agentCard?.skills)
+      ? (agentCard.skills as Array<Record<string, unknown>>).map(
+          (s) => String(s.name || s.id || ""),
+        ).filter(Boolean)
+      : [];
+    return {
+      runtime: (typeof data.runtime === "string" && data.runtime)
+        ? data.runtime
+        : (typeof agentCard?.runtime === "string" ? String(agentCard.runtime) : null),
+      skills,
+      skillCount: skills.length,
+      currentTask: String(data.currentTask ?? ""),
+      hasActiveTask: String(data.currentTask ?? "").trim().length > 0,
+    };
+  }),
+}));
+
+// Stub the API so DetailActivity doesn't attempt real network calls.
+vi.mock("@/lib/api", () => ({ api: { get: vi.fn().mockResolvedValue([]) } }));
+
+// ─── Fixtures ────────────────────────────────────────────────────────────────
+
+const onlineNode = {
+  id: mockNodeId,
+  position: { x: 100, y: 200 },
+  data: {
+    name: "Test Agent",
+    status: "online",
+    tier: 2,
+    agentCard: {
+      runtime: "claude-code",
+      skills: [
+        { name: "web-search", id: "skill-1" },
+        { name: "code-review", id: "skill-2" },
+        { name: "file-ops", id: "skill-3" },
+      ],
+    },
+    currentTask: "Reviewing PR #717",
+    activeTasks: 3,
+    collapsed: false,
+    role: "agent",
+    lastErrorRate: 0,
+    lastSampleError: "",
+    url: "",
+    parentId: null,
+    runtime: "claude-code",
+    needsRestart: false,
+  },
+  width: 240,
+  height: 130,
+};
+
+const failedNode = {
+  id: "ws-failed",
+  position: { x: 0, y: 0 },
+  data: {
+    name: "Failed Worker",
+    status: "failed",
+    tier: 4,
+    agentCard: null,
+    currentTask: "",
+    activeTasks: 0,
+    collapsed: false,
+    role: "agent",
+    lastErrorRate: 0.8,
+    lastSampleError: "Connection refused",
+    url: "",
+    parentId: null,
+    runtime: "external",
+    needsRestart: false,
+  },
+};
+
+const offlineNode = {
+  id: "ws-offline",
+  position: { x: 0, y: 0 },
+  data: {
+    name: "Offline Bot",
+    status: "offline",
+    tier: 1,
+    agentCard: null,
+    currentTask: "",
+    activeTasks: 0,
+    collapsed: false,
+    role: "agent",
+    lastErrorRate: 0,
+    lastSampleError: "",
+    url: "",
+    parentId: null,
+    runtime: "claude-code",
+    needsRestart: false,
+  },
+};
+
+// ─── Helpers ─────────────────────────────────────────────────────────────────
+
+function renderDetail(agentId: string, dark = false) {
+  return render(
+    <MobileDetail
+      agentId={agentId}
+      dark={dark}
+      onBack={mockOnBack}
+      onChat={mockOnChat}
+    />,
+  );
+}
+
+// ─── Setup / teardown ─────────────────────────────────────────────────────────
+
+beforeEach(() => {
+  mockOnBack.mockClear();
+  mockOnChat.mockClear();
+  mockStoreState.nodes = [];
+});
+
+afterEach(() => {
+  cleanup();
+  vi.clearAllMocks();
+});
+
+// ─── Not found ────────────────────────────────────────────────────────────────
+
+describe("MobileDetail — agent not found", () => {
+  it('renders "Agent not found." when no node matches agentId', () => {
+    mockStoreState.nodes = [onlineNode];
+    const { container } = renderDetail("nonexistent-id");
+    expect(container.textContent ?? "").toContain("Agent not found.");
+  });
+
+  it("does not render any tab buttons when agent not found", () => {
+    mockStoreState.nodes = [];
+    const { container } = renderDetail("ghost-agent");
+    expect(container.querySelectorAll("button").length).toBe(0);
+  });
+});
+
+// ─── Hero render ─────────────────────────────────────────────────────────────
+
+describe("MobileDetail — hero section", () => {
+  beforeEach(() => {
+    mockStoreState.nodes = [onlineNode];
+  });
+
+  it("renders the agent name as an h1", () => {
+    const { container } = renderDetail(mockNodeId);
+    const h1 = container.querySelector("h1");
+    expect(h1).toBeTruthy();
+    expect(h1!.textContent).toBe("Test Agent");
+  });
+
+  it("renders agent tag below the name", () => {
+    const { container } = renderDetail(mockNodeId);
+    // Tag appears in the hero section, styled differently from the name
+    expect(container.textContent ?? "").toContain("claude-code");
+  });
+
+  it("renders a Back button with aria-label", () => {
+    const { container } = renderDetail(mockNodeId);
+    const backBtn = container.querySelector('[aria-label="Back"]');
+    expect(backBtn).toBeTruthy();
+  });
+
+  it("Back button calls onBack", () => {
+    const { container } = renderDetail(mockNodeId);
+    const backBtn = container.querySelector('[aria-label="Back"]') as HTMLButtonElement;
+    backBtn.click();
+    expect(mockOnBack).toHaveBeenCalledTimes(1);
+  });
+
+  it("renders a More button", () => {
+    const { container } = renderDetail(mockNodeId);
+    const moreBtn = container.querySelector('[aria-label="More"]');
+    expect(moreBtn).toBeTruthy();
+  });
+
+  it("renders Chat CTA with icon text", () => {
+    const { container } = renderDetail(mockNodeId);
+    expect(container.textContent ?? "").toContain("Open chat");
+  });
+
+  it("Chat CTA calls onChat", () => {
+    const { container } = renderDetail(mockNodeId);
+    const chatBtn = Array.from(container.querySelectorAll("button")).find(
+      (b) => b.textContent?.includes("Open chat"),
+    );
+    expect(chatBtn).toBeTruthy();
+    (chatBtn as HTMLButtonElement).click();
+    expect(mockOnChat).toHaveBeenCalledTimes(1);
+  });
+});
+
+// ─── Pill stats ───────────────────────────────────────────────────────────────
+
+describe("MobileDetail — pill stats", () => {
+  beforeEach(() => {
+    mockStoreState.nodes = [onlineNode];
+  });
+
+  it("renders TIER pill with the agent tier", () => {
+    const { container } = renderDetail(mockNodeId);
+    expect(container.textContent ?? "").toContain("TIER");
+  });
+
+  it("renders RUNTIME pill", () => {
+    const { container } = renderDetail(mockNodeId);
+    expect(container.textContent ?? "").toContain("RUNTIME");
+  });
+
+  it("renders SKILLS pill with count", () => {
+    const { container } = renderDetail(mockNodeId);
+    // 3 skills in the agentCard fixture
+    expect(container.textContent ?? "").toContain("SKILLS");
+  });
+
+  it("renders STATUS pill", () => {
+    const { container } = renderDetail(mockNodeId);
+    expect(container.textContent ?? "").toContain("STATUS");
+  });
+
+  it("STATUS pill shows agent status value", () => {
+    const { container } = renderDetail(mockNodeId);
+    // online status from the fixture
+    expect(container.textContent ?? "").toContain("online");
+  });
+
+  it("renders all 4 pills for online agent", () => {
+    const { container } = renderDetail(mockNodeId);
+    // Count the pill container divs — each PillStat is a div with specific inline styles
+    // We verify by content: TIER, RUNTIME, SKILLS, STATUS should all be present
+    const text = container.textContent ?? "";
+    expect(text).toContain("TIER");
+    expect(text).toContain("RUNTIME");
+    expect(text).toContain("SKILLS");
+    expect(text).toContain("STATUS");
+  });
+});
+
+// ─── Tabs ─────────────────────────────────────────────────────────────────────
+
+describe("MobileDetail — tab switching", () => {
+  beforeEach(() => {
+    mockStoreState.nodes = [onlineNode];
+  });
+
+  it("renders all 4 tab buttons", () => {
+    const { container } = renderDetail(mockNodeId);
+    const text = container.textContent ?? "";
+    expect(text).toContain("Overview");
+    expect(text).toContain("Activity");
+    expect(text).toContain("Config");
+    expect(text).toContain("Memory");
+  });
+
+  it("defaults to Overview tab", () => {
+    const { container } = renderDetail(mockNodeId);
+    // DetailOverview renders ID, Tier, Runtime, Active tasks, Skills, Origin rows
+    expect(container.textContent ?? "").toContain("ID");
+    expect(container.textContent ?? "").toContain("Tier");
+  });
+
+  it("Overview tab shows agent ID", () => {
+    const { container } = renderDetail(mockNodeId);
+    expect(container.textContent ?? "").toContain(mockNodeId);
+  });
+
+  it("Overview tab shows active tasks count", () => {
+    const { container } = renderDetail(mockNodeId);
+    // onlineNode has activeTasks: 3
+    expect(container.textContent ?? "").toContain("Active tasks");
+    expect(container.textContent ?? "").toContain("3");
+  });
+
+  it("Overview tab shows skill count", () => {
+    const { container } = renderDetail(mockNodeId);
+    // 3 skills in agentCard
+    expect(container.textContent ?? "").toContain("Skills");
+    expect(container.textContent ?? "").toContain("3 loaded");
+  });
+
+  it("Config tab button is findable and is a button element", () => {
+    const { container } = renderDetail(mockNodeId);
+    const configTab = Array.from(container.querySelectorAll("button")).find(
+      (b) => b.textContent?.trim() === "Config",
+    );
+    expect(configTab).toBeTruthy();
+    expect((configTab as HTMLButtonElement).type).toBe("button");
+  });
+
+  it("Memory tab button is findable and is a button element", () => {
+    const { container } = renderDetail(mockNodeId);
+    const memoryTab = Array.from(container.querySelectorAll("button")).find(
+      (b) => b.textContent?.trim() === "Memory",
+    );
+    expect(memoryTab).toBeTruthy();
+    expect((memoryTab as HTMLButtonElement).type).toBe("button");
+  });
+});
+
+// ─── Status rendering ─────────────────────────────────────────────────────────
+
+describe("MobileDetail — status rendering", () => {
+  it("renders failed status for failed agent", () => {
+    mockStoreState.nodes = [failedNode];
+    const { container } = renderDetail("ws-failed");
+    expect(container.textContent ?? "").toContain("Failed Worker");
+    expect(container.textContent ?? "").toContain("failed");
+  });
+
+  it("renders offline status for offline agent", () => {
+    mockStoreState.nodes = [offlineNode];
+    const { container } = renderDetail("ws-offline");
+    expect(container.textContent ?? "").toContain("Offline Bot");
+    expect(container.textContent ?? "").toContain("offline");
+  });
+});
+
+// ─── Dark mode ───────────────────────────────────────────────────────────────
+
+describe("MobileDetail — dark mode", () => {
+  beforeEach(() => {
+    mockStoreState.nodes = [onlineNode];
+  });
+
+  it("renders without crashing in dark mode", () => {
+    const { container } = renderDetail(mockNodeId, true);
+    expect(container.querySelector("h1")?.textContent).toBe("Test Agent");
+  });
+});
diff --git a/canvas/src/components/mobile/__tests__/MobileHome.test.tsx b/canvas/src/components/mobile/__tests__/MobileHome.test.tsx
new file mode 100644
index 00000000..0c49df2b
--- /dev/null
+++ b/canvas/src/components/mobile/__tests__/MobileHome.test.tsx
@@ -0,0 +1,245 @@
+// @vitest-environment jsdom
+/**
+ * MobileHome — workspace agent list + filter chips + spawn FAB.
+ *
+ * Per spec §01: live store data, filter by status, spawn FAB.
+ *
+ * NOTE: No @testing-library/jest-dom — use DOM APIs.
+ */
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { cleanup, render } from "@testing-library/react";
+import React from "react";
+
+import { MobileHome } from "../MobileHome";
+
+// ─── Mock store ───────────────────────────────────────────────────────────────
+
+const mockOnOpen = vi.fn();
+const mockOnSpawn = vi.fn();
+
+const mockStoreState = {
+  nodes: [] as Array<{
+    id: string;
+    position: { x: number; y: number };
+    data: Record<string, unknown>;
+    width?: number;
+    height?: number;
+  }>,
+};
+
+vi.mock("@/store/canvas", () => ({
+  useCanvasStore: Object.assign(
+    vi.fn((sel) => sel(mockStoreState)),
+    { getState: () => mockStoreState },
+  ),
+  summarizeWorkspaceCapabilities: vi.fn((data: Record<string, unknown>) => {
+    const agentCard = data.agentCard as Record<string, unknown> | null;
+    const skills = Array.isArray(agentCard?.skills)
+      ? (agentCard.skills as Array<Record<string, unknown>>).map(
+          (s) => String(s.name || s.id || ""),
+        ).filter(Boolean)
+      : [];
+    return {
+      runtime: (typeof data.runtime === "string" && data.runtime)
+        ? data.runtime
+        : (typeof agentCard?.runtime === "string" ? String(agentCard.runtime) : null),
+      skills,
+      skillCount: skills.length,
+      currentTask: String(data.currentTask ?? ""),
+      hasActiveTask: String(data.currentTask ?? "").trim().length > 0,
+    };
+  }),
+}));
+
+// ─── Fixtures ───────────────────────────────────────────────────────────────
+
+function makeNode(overrides: Partial<Record<string, unknown>> = {}) {
+  return {
+    id: `ws-${Math.random().toString(36).slice(2, 7)}`,
+    position: { x: 0, y: 0 },
+    data: {
+      name: "Agent",
+      status: "online",
+      tier: 2,
+      agentCard: null,
+      currentTask: "",
+      activeTasks: 0,
+      collapsed: false,
+      role: "agent",
+      lastErrorRate: 0,
+      lastSampleError: "",
+      url: "",
+      parentId: null,
+      runtime: "claude-code",
+      needsRestart: false,
+      ...overrides,
+    },
+  };
+}
+
+const onlineAgent = makeNode({ name: "Online Agent", status: "online", tier: 2 });
+const failedAgent = makeNode({ name: "Failed Agent", status: "failed", tier: 4 });
+const pausedAgent = makeNode({ name: "Paused Agent", status: "paused", tier: 1 });
+
+// ─── Helpers ─────────────────────────────────────────────────────────────────
+
+function renderHome(overrides: Partial<{
+  dark: boolean;
+  density: "compact" | "regular";
+  workspaceLabel: string;
+  username: string;
+}> = {}) {
+  return render(
+    <MobileHome
+      dark={overrides.dark ?? false}
+      density={overrides.density ?? "regular"}
+      onOpen={mockOnOpen}
+      onSpawn={mockOnSpawn}
+      workspaceLabel={overrides.workspaceLabel}
+      username={overrides.username}
+    />,
+  );
+}
+
+// ─── Setup / teardown ─────────────────────────────────────────────────────────
+
+beforeEach(() => {
+  mockOnOpen.mockClear();
+  mockOnSpawn.mockClear();
+  mockStoreState.nodes = [];
+});
+
+afterEach(() => {
+  cleanup();
+});
+
+// ─── Structure ───────────────────────────────────────────────────────────────
+
+describe("MobileHome — page structure", () => {
+  it('renders "Agents" heading', () => {
+    mockStoreState.nodes = [onlineAgent];
+    const { container } = renderHome();
+    const h1 = container.querySelector("h1");
+    expect(h1).toBeTruthy();
+    expect(h1!.textContent).toBe("Agents");
+  });
+
+  it("renders WorkspacePill with agent count", () => {
+    mockStoreState.nodes = [onlineAgent, failedAgent];
+    const { container } = renderHome();
+    // WorkspacePill renders the agent count somewhere in the DOM
+    expect(container.textContent ?? "").toContain("2");
+  });
+
+  it('shows "live" suffix in subheading', () => {
+    mockStoreState.nodes = [onlineAgent];
+    const { container } = renderHome();
+    // Single agent → "1 workspace · live" (singular)
+    expect(container.textContent ?? "").toContain("workspace");
+    expect(container.textContent ?? "").toContain("live");
+  });
+
+  it("renders FilterChips row", () => {
+    mockStoreState.nodes = [onlineAgent];
+    const { container } = renderHome();
+    // FilterChips renders buttons for "All", "Online", "Issues", "Paused"
+    const text = container.textContent ?? "";
+    expect(text).toContain("All");
+    expect(text).toContain("Online");
+    expect(text).toContain("Issues");
+  });
+
+  it("renders Workspace section label", () => {
+    mockStoreState.nodes = [onlineAgent];
+    const { container } = renderHome();
+    expect(container.textContent ?? "").toContain("Workspace");
+  });
+
+  it("renders spawn FAB with aria-label", () => {
+    mockStoreState.nodes = [onlineAgent];
+    const { container } = renderHome();
+    const fab = container.querySelector('[aria-label="Spawn new agent"]');
+    expect(fab).toBeTruthy();
+  });
+
+  it("FAB calls onSpawn", () => {
+    mockStoreState.nodes = [onlineAgent];
+    const { container } = renderHome();
+    const fab = container.querySelector('[aria-label="Spawn new agent"]') as HTMLButtonElement;
+    fab.click();
+    expect(mockOnSpawn).toHaveBeenCalledTimes(1);
+  });
+
+  it("shows username when provided", () => {
+    mockStoreState.nodes = [onlineAgent];
+    const { container } = renderHome({ username: "alice@example.com" });
+    expect(container.textContent ?? "").toContain("alice@example.com");
+  });
+
+  it("omits username when not provided", () => {
+    mockStoreState.nodes = [onlineAgent];
+    const { container } = renderHome();
+    expect(container.querySelector('[style*="letter-spacing"]')?.textContent).not.toContain("@");
+  });
+
+  it("renders with custom workspaceLabel", () => {
+    mockStoreState.nodes = [onlineAgent];
+    const { container } = renderHome({ workspaceLabel: "Production" });
+    expect(container.textContent ?? "").toContain("Production");
+  });
+});
+
+// ─── Agent list ─────────────────────────────────────────────────────────────
+
+describe("MobileHome — agent list", () => {
+  it("renders agent cards when nodes are present", () => {
+    mockStoreState.nodes = [onlineAgent, failedAgent, pausedAgent];
+    const { container } = renderHome();
+    expect(container.textContent ?? "").toContain("Online Agent");
+    expect(container.textContent ?? "").toContain("Failed Agent");
+    expect(container.textContent ?? "").toContain("Paused Agent");
+  });
+
+  it("shows 'No agents match this filter.' when filter returns empty", () => {
+    mockStoreState.nodes = [onlineAgent];
+    const { container } = renderHome();
+    // By default filter is "all" — all agents match
+    expect(container.textContent ?? "").not.toContain("No agents match");
+    // If we could set filter to something that filters everything out...
+    // (filter is internal state, we test the "all" default)
+    expect(container.querySelectorAll("button").length).toBeGreaterThan(0);
+  });
+
+  it("renders no agents when node list is empty", () => {
+    mockStoreState.nodes = [];
+    const { container } = renderHome();
+    // Should show "0 workspaces" and "No agents match this filter."
+    expect(container.textContent ?? "").toContain("0 workspace");
+  });
+});
+
+// ─── Agent count display ──────────────────────────────────────────────────────
+
+describe("MobileHome — agent count", () => {
+  it("shows singular 'workspace' when count is 1", () => {
+    mockStoreState.nodes = [onlineAgent];
+    const { container } = renderHome();
+    expect(container.textContent ?? "").toContain("1 workspace");
+  });
+
+  it("shows plural 'workspaces' when count is > 1", () => {
+    mockStoreState.nodes = [onlineAgent, failedAgent];
+    const { container } = renderHome();
+    expect(container.textContent ?? "").toContain("2 workspaces");
+  });
+});
+
+// ─── Dark mode ───────────────────────────────────────────────────────────────
+
+describe("MobileHome — dark mode", () => {
+  it("renders without crashing in dark mode", () => {
+    mockStoreState.nodes = [onlineAgent];
+    const { container } = renderHome({ dark: true });
+    expect(container.querySelector("h1")?.textContent).toBe("Agents");
+  });
+});
diff --git a/canvas/src/components/mobile/__tests__/MobileMe.test.tsx b/canvas/src/components/mobile/__tests__/MobileMe.test.tsx
new file mode 100644
index 00000000..cdda9712
--- /dev/null
+++ b/canvas/src/components/mobile/__tests__/MobileMe.test.tsx
@@ -0,0 +1,212 @@
+// @vitest-environment jsdom
+/**
+ * MobileMe — theme, accent, and density preferences.
+ *
+ * Per spec: theme + accent + density settings for mobile.
+ *
+ * NOTE: No @testing-library/jest-dom — use DOM APIs.
+ */
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { cleanup, render } from "@testing-library/react";
+import React from "react";
+
+import { MobileMe } from "../MobileMe";
+
+// ─── Mock theme provider ───────────────────────────────────────────────────────
+
+const mockSetTheme = vi.fn();
+const mockSetAccent = vi.fn();
+const mockSetDensity = vi.fn();
+
+vi.mock("@/lib/theme-provider", () => ({
+  useTheme: vi.fn(() => ({
+    theme: "system",
+    resolvedTheme: "light",
+    setTheme: mockSetTheme,
+  })),
+}));
+
+// ─── Helpers ─────────────────────────────────────────────────────────────────
+
+function renderMe(overrides: Partial<{
+  dark: boolean;
+  accent: string;
+  density: "compact" | "regular";
+}> = {}) {
+  return render(
+    <MobileMe
+      dark={overrides.dark ?? false}
+      accent={overrides.accent ?? "#2f9e6a"}
+      setAccent={mockSetAccent}
+      density={overrides.density ?? "regular"}
+      setDensity={mockSetDensity}
+    />,
+  );
+}
+
+// ─── Setup / teardown ─────────────────────────────────────────────────────────
+
+beforeEach(() => {
+  mockSetTheme.mockClear();
+  mockSetAccent.mockClear();
+  mockSetDensity.mockClear();
+});
+
+afterEach(() => {
+  cleanup();
+});
+
+// ─── Structure ───────────────────────────────────────────────────────────────
+
+describe("MobileMe — page structure", () => {
+  it('renders "Me" heading', () => {
+    const { container } = renderMe();
+    const h1 = container.querySelector("h1");
+    expect(h1).toBeTruthy();
+    expect(h1!.textContent).toBe("Me");
+  });
+
+  it("renders theme section label", () => {
+    const { container } = renderMe();
+    expect(container.textContent ?? "").toContain("Theme");
+  });
+
+  it("renders theme options: System, Light, Dark", () => {
+    const { container } = renderMe();
+    const text = container.textContent ?? "";
+    expect(text).toContain("System");
+    expect(text).toContain("Light");
+    expect(text).toContain("Dark");
+  });
+
+  it("renders accent section label", () => {
+    const { container } = renderMe();
+    expect(container.textContent ?? "").toContain("Accent");
+  });
+
+  it("renders all 5 accent color swatches", () => {
+    const { container } = renderMe();
+    const swatches = container.querySelectorAll("button[aria-label]");
+    // 5 accent swatches + theme buttons + density buttons = more than 5
+    // We verify the accent swatches by checking aria-labels
+    const accentLabels = Array.from(swatches)
+      .map((b) => b.getAttribute("aria-label") ?? "")
+      .filter((l) => l.startsWith("Set accent"));
+    expect(accentLabels.length).toBe(5);
+  });
+
+  it("renders density section label", () => {
+    const { container } = renderMe();
+    expect(container.textContent ?? "").toContain("Density");
+  });
+
+  it("renders density options: Regular, Compact", () => {
+    const { container } = renderMe();
+    const text = container.textContent ?? "";
+    expect(text).toContain("Regular");
+    expect(text).toContain("Compact");
+  });
+
+  it("renders version footer", () => {
+    const { container } = renderMe();
+    expect(container.textContent ?? "").toContain("Mobile design preview");
+  });
+});
+
+// ─── Theme selection ──────────────────────────────────────────────────────────
+
+describe("MobileMe — theme selection", () => {
+  it("renders System as the active theme (from mock)", () => {
+    const { container } = renderMe();
+    // The theme buttons are rendered; System is active in our mock
+    // We verify the buttons exist and are findable
+    const buttons = Array.from(container.querySelectorAll("button"));
+    const themeButtons = buttons.filter(
+      (b) => ["System", "Light", "Dark"].includes(b.textContent?.trim() ?? ""),
+    );
+    expect(themeButtons.length).toBe(3);
+  });
+
+  it("calls setTheme when a theme button is clicked", () => {
+    const { container } = renderMe();
+    const darkBtn = Array.from(container.querySelectorAll("button")).find(
+      (b) => b.textContent?.trim() === "Dark",
+    );
+    expect(darkBtn).toBeTruthy();
+    darkBtn!.click();
+    expect(mockSetTheme).toHaveBeenCalledWith("dark");
+  });
+});
+
+// ─── Accent selection ────────────────────────────────────────────────────────
+
+describe("MobileMe — accent selection", () => {
+  it("renders accent buttons with aria-label", () => {
+    const { container } = renderMe();
+    const swatches = container.querySelectorAll("button[aria-label]");
+    const accentSwatches = Array.from(swatches).filter(
+      (b) => (b.getAttribute("aria-label") ?? "").startsWith("Set accent"),
+    );
+    expect(accentSwatches.length).toBe(5);
+  });
+
+  it("calls setAccent with the correct color", () => {
+    const { container } = renderMe();
+    const swatch = Array.from(container.querySelectorAll("button[aria-label]")).find(
+      (b) => b.getAttribute("aria-label") === "Set accent #3b6fe0",
+    );
+    expect(swatch).toBeTruthy();
+    swatch!.click();
+    expect(mockSetAccent).toHaveBeenCalledWith("#3b6fe0");
+  });
+});
+
+// ─── Density selection ────────────────────────────────────────────────────────
+
+describe("MobileMe — density selection", () => {
+  it("renders density buttons", () => {
+    const { container } = renderMe();
+    const buttons = Array.from(container.querySelectorAll("button"));
+    const densityButtons = buttons.filter(
+      (b) => ["Regular", "Compact"].includes(b.textContent?.trim() ?? ""),
+    );
+    expect(densityButtons.length).toBe(2);
+  });
+
+  it("calls setDensity when Compact is clicked", () => {
+    const { container } = renderMe({ density: "regular" });
+    const compactBtn = Array.from(container.querySelectorAll("button")).find(
+      (b) => b.textContent?.trim() === "Compact",
+    );
+    expect(compactBtn).toBeTruthy();
+    compactBtn!.click();
+    expect(mockSetDensity).toHaveBeenCalledWith("compact");
+  });
+
+  it("calls setDensity when Regular is clicked", () => {
+    const { container } = renderMe({ density: "compact" });
+    const regularBtn = Array.from(container.querySelectorAll("button")).find(
+      (b) => b.textContent?.trim() === "Regular",
+    );
+    expect(regularBtn).toBeTruthy();
+    regularBtn!.click();
+    expect(mockSetDensity).toHaveBeenCalledWith("regular");
+  });
+});
+
+// ─── Dark mode ───────────────────────────────────────────────────────────────
+
+describe("MobileMe — dark mode", () => {
+  it("renders without crashing in dark mode", () => {
+    const { container } = renderMe({ dark: true });
+    expect(container.querySelector("h1")?.textContent).toBe("Me");
+  });
+
+  it("renders theme, accent, and density sections in dark mode", () => {
+    const { container } = renderMe({ dark: true });
+    const text = container.textContent ?? "";
+    expect(text).toContain("Theme");
+    expect(text).toContain("Accent");
+    expect(text).toContain("Density");
+  });
+});