diff --git a/packages/api/src/__tests__/assistant-tools-audit-task-test-helpers.ts b/packages/api/src/__tests__/assistant-tools-audit-task-test-helpers.ts
new file mode 100644
index 0000000..9341982
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-audit-task-test-helpers.ts
@@ -0,0 +1,37 @@
+import { SystemRole } from "@capakraken/shared";
+import type { ToolContext } from "../router/assistant-tools.js";
+
+export function createToolContext(
+  db: Record<string, unknown>,
+  options?: {
+    userRole?: SystemRole;
+  },
+): ToolContext {
+  const userRole = options?.userRole ?? SystemRole.ADMIN;
+  let effectiveDb: Record<string, unknown>;
+  effectiveDb = "$transaction" in db
+    ? db
+    : {
+      ...db,
+      $transaction: async (
+        callback: (tx: ToolContext["db"]) => Promise<unknown>,
+      ) => callback(effectiveDb as ToolContext["db"]),
+    };
+
+  return {
+    db: effectiveDb as ToolContext["db"],
+    userId: "user_1",
+    userRole,
+    permissions: new Set(),
+    session: {
+      user: { email: "assistant@example.com", name: "Assistant User", image: null },
+      expires: "2026-03-29T00:00:00.000Z",
+    },
+    dbUser: {
+      id: "user_1",
+      systemRole: userRole,
+      permissionOverrides: null,
+    },
+    roleDefaults: null,
+  };
+}
diff --git a/packages/api/src/__tests__/assistant-tools-task-counts.test.ts b/packages/api/src/__tests__/assistant-tools-task-counts.test.ts
new file mode 100644
index 0000000..d4e993c
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-task-counts.test.ts
@@ -0,0 +1,52 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { SystemRole } from "@capakraken/shared";
+import {
+  createToolContext,
+  executeTool,
+  withUserLookup,
+} from "./assistant-tools-task-workflow-test-helpers.js";
+
+describe("assistant task counts tool", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("returns task counts for the current user through the real router path", async () => {
+    const db = withUserLookup({
+      notification: {
+        groupBy: vi.fn().mockResolvedValue([
+          { taskStatus: "OPEN", _count: 4 },
+          { taskStatus: "DONE", _count: 2 },
+        ]),
+        count: vi.fn().mockResolvedValue(3),
+      },
+    });
+    const ctx = createToolContext(db, SystemRole.USER);
+
+    const result = await executeTool("get_task_counts", JSON.stringify({}), ctx);
+
+    expect(db.notification.groupBy).toHaveBeenCalledWith({
+      by: ["taskStatus"],
+      where: {
+        OR: [{ userId: "user_1" }, { assigneeId: "user_1" }],
+        category: { in: ["TASK", "APPROVAL"] },
+      },
+      _count: true,
+    });
+    expect(db.notification.count).toHaveBeenCalledWith({
+      where: {
+        OR: [{ userId: "user_1" }, { assigneeId: "user_1" }],
+        category: { in: ["TASK", "APPROVAL"] },
+        taskStatus: { in: ["OPEN", "IN_PROGRESS"] },
+        dueDate: { lt: expect.any(Date) },
+      },
+    });
+    expect(JSON.parse(result.content)).toEqual({
+      open: 4,
+      inProgress: 0,
+      done: 2,
+      dismissed: 0,
+      overdue: 3,
+    });
+  });
+});
diff --git a/packages/api/src/__tests__/assistant-tools-task-create-errors.test.ts b/packages/api/src/__tests__/assistant-tools-task-create-errors.test.ts
new file mode 100644
index 0000000..aef1277
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-task-create-errors.test.ts
@@ -0,0 +1,118 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { SystemRole } from "@capakraken/shared";
+
+vi.mock("@capakraken/application", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("@capakraken/application")>();
+  return {
+    ...actual,
+    approveEstimateVersion: vi.fn(),
+    cloneEstimate: vi.fn(),
+    commitDispoImportBatch: vi.fn(),
+    countPlanningEntries: vi.fn().mockResolvedValue({ countsByRoleId: new Map() }),
+    createEstimateExport: vi.fn(),
+    createEstimatePlanningHandoff: vi.fn(),
+    createEstimateRevision: vi.fn(),
+    assessDispoImportReadiness: vi.fn(),
+    loadResourceDailyAvailabilityContexts: vi.fn().mockResolvedValue(new Map()),
+    getDashboardDemand: vi.fn().mockResolvedValue([]),
+    getDashboardBudgetForecast: vi.fn().mockResolvedValue([]),
+    getDashboardOverview: vi.fn(),
+    getDashboardSkillGapSummary: vi.fn().mockResolvedValue({
+      roleGaps: [],
+      totalOpenPositions: 0,
+      skillSupplyTop10: [],
+      resourcesByRole: [],
+    }),
+    getDashboardProjectHealth: vi.fn().mockResolvedValue([]),
+    getDashboardPeakTimes: vi.fn().mockResolvedValue([]),
+    getDashboardTopValueResources: vi.fn().mockResolvedValue([]),
+    getEstimateById: vi.fn(),
+    listAssignmentBookings: vi.fn().mockResolvedValue([]),
+    stageDispoImportBatch: vi.fn(),
+    submitEstimateVersion: vi.fn(),
+    updateEstimateDraft: vi.fn(),
+  };
+});
+
+import { executeTool } from "../router/assistant-tools.js";
+import { createToolContext } from "./assistant-tools-notification-test-helpers.js";
+
+describe("assistant task creation tools errors", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("returns a stable assistant error when task dueDate is invalid", async () => {
+    const ctx = createToolContext({}, SystemRole.MANAGER);
+
+    const result = await executeTool(
+      "create_task_for_user",
+      JSON.stringify({
+        userId: "user_2",
+        title: "Follow up",
+        dueDate: "not-a-datetime",
+      }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: "Invalid dueDate: not-a-datetime",
+    });
+  });
+
+  it("returns a stable assistant error when task recipient user is missing", async () => {
+    const ctx = createToolContext(
+      {
+        notification: {
+          create: vi.fn().mockRejectedValue({
+            code: "P2003",
+            message: "Foreign key constraint failed",
+            meta: { field_name: "Notification_userId_fkey" },
+          }),
+        },
+      },
+      SystemRole.MANAGER,
+    );
+
+    const result = await executeTool(
+      "create_task_for_user",
+      JSON.stringify({
+        userId: "user_missing",
+        title: "Follow up",
+      }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: "Task recipient user not found with the given criteria.",
+    });
+  });
+
+  it("returns a stable assistant error when task sender user is missing", async () => {
+    const ctx = createToolContext(
+      {
+        notification: {
+          create: vi.fn().mockRejectedValue({
+            code: "P2003",
+            message: "Foreign key constraint failed",
+            meta: { field_name: "Notification_senderId_fkey" },
+          }),
+        },
+      },
+      SystemRole.MANAGER,
+    );
+
+    const result = await executeTool(
+      "create_task_for_user",
+      JSON.stringify({
+        userId: "user_2",
+        title: "Follow up",
+      }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: "Sender user not found with the given criteria.",
+    });
+  });
+});
diff --git a/packages/api/src/__tests__/assistant-tools-task-create-success.test.ts b/packages/api/src/__tests__/assistant-tools-task-create-success.test.ts
new file mode 100644
index 0000000..c71912d
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-task-create-success.test.ts
@@ -0,0 +1,96 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { SystemRole } from "@capakraken/shared";
+
+vi.mock("@capakraken/application", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("@capakraken/application")>();
+  return {
+    ...actual,
+    approveEstimateVersion: vi.fn(),
+    cloneEstimate: vi.fn(),
+    commitDispoImportBatch: vi.fn(),
+    countPlanningEntries: vi.fn().mockResolvedValue({ countsByRoleId: new Map() }),
+    createEstimateExport: vi.fn(),
+    createEstimatePlanningHandoff: vi.fn(),
+    createEstimateRevision: vi.fn(),
+    assessDispoImportReadiness: vi.fn(),
+    loadResourceDailyAvailabilityContexts: vi.fn().mockResolvedValue(new Map()),
+    getDashboardDemand: vi.fn().mockResolvedValue([]),
+    getDashboardBudgetForecast: vi.fn().mockResolvedValue([]),
+    getDashboardOverview: vi.fn(),
+    getDashboardSkillGapSummary: vi.fn().mockResolvedValue({
+      roleGaps: [],
+      totalOpenPositions: 0,
+      skillSupplyTop10: [],
+      resourcesByRole: [],
+    }),
+    getDashboardProjectHealth: vi.fn().mockResolvedValue([]),
+    getDashboardPeakTimes: vi.fn().mockResolvedValue([]),
+    getDashboardTopValueResources: vi.fn().mockResolvedValue([]),
+    getEstimateById: vi.fn(),
+    listAssignmentBookings: vi.fn().mockResolvedValue([]),
+    stageDispoImportBatch: vi.fn(),
+    submitEstimateVersion: vi.fn(),
+    updateEstimateDraft: vi.fn(),
+  };
+});
+
+import { executeTool } from "../router/assistant-tools.js";
+import { createToolContext } from "./assistant-tools-notification-test-helpers.js";
+
+describe("assistant task creation tools success", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("creates a task for a user through the notification router", async () => {
+    const db = {
+      notification: {
+        create: vi.fn().mockResolvedValue({ id: "task_2", userId: "user_2" }),
+        findUnique: vi.fn().mockResolvedValue({
+          id: "task_2",
+          title: "Follow up",
+          category: "TASK",
+          taskStatus: "OPEN",
+        }),
+      },
+      user: {
+        findUnique: vi.fn().mockResolvedValue({ id: "user_2", email: "user2@example.com", name: "User Two" }),
+      },
+    };
+    const ctx = createToolContext(db, SystemRole.ADMIN);
+
+    const result = await executeTool(
+      "create_task_for_user",
+      JSON.stringify({
+        userId: "user_2",
+        title: "Follow up",
+        dueDate: "2026-04-03T11:00:00.000Z",
+        channel: "in_app",
+      }),
+      ctx,
+    );
+
+    expect(db.notification.create).toHaveBeenCalledWith({
+      data: expect.objectContaining({
+        userId: "user_2",
+        type: "TASK_CREATED",
+        category: "TASK",
+        taskStatus: "OPEN",
+        title: "Follow up",
+        dueDate: new Date("2026-04-03T11:00:00.000Z"),
+        senderId: "user_1",
+        channel: "in_app",
+      }),
+    });
+    expect(db.notification.findUnique).toHaveBeenCalledWith({
+      where: { id: "task_2" },
+    });
+    expect(JSON.parse(result.content)).toEqual(
+      expect.objectContaining({
+        success: true,
+        taskId: "task_2",
+        message: 'Created task "Follow up" for user_2.',
+      }),
+    );
+  });
+});
diff --git a/packages/api/src/__tests__/assistant-tools-task-detail.test.ts b/packages/api/src/__tests__/assistant-tools-task-detail.test.ts
new file mode 100644
index 0000000..f461949
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-task-detail.test.ts
@@ -0,0 +1,75 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { SystemRole } from "@capakraken/shared";
+import {
+  createToolContext,
+  executeTool,
+  withUserLookup,
+} from "./assistant-tools-task-workflow-test-helpers.js";
+
+describe("assistant task detail tool", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("maps taskId for get_task_detail through the real router path", async () => {
+    const db = withUserLookup({
+      notification: {
+        findFirst: vi.fn().mockResolvedValue({
+          id: "task_7",
+          title: "Review timeline",
+          category: "TASK",
+          userId: "user_1",
+          assigneeId: null,
+          sender: { id: "user_mgr", name: "Manager", email: "mgr@example.com" },
+        }),
+      },
+    });
+    const ctx = createToolContext(db, SystemRole.USER);
+
+    const result = await executeTool(
+      "get_task_detail",
+      JSON.stringify({ taskId: "task_7" }),
+      ctx,
+    );
+
+    expect(db.notification.findFirst).toHaveBeenCalledWith({
+      where: {
+        id: "task_7",
+        OR: [{ userId: "user_1" }, { assigneeId: "user_1" }],
+        category: { in: ["TASK", "APPROVAL"] },
+      },
+      select: expect.objectContaining({
+        id: true,
+        title: true,
+        sender: { select: { id: true, name: true, email: true } },
+      }),
+    });
+    expect(JSON.parse(result.content)).toEqual(
+      expect.objectContaining({
+        id: "task_7",
+        title: "Review timeline",
+      }),
+    );
+  });
+
+  it("returns a stable assistant error for a missing task detail", async () => {
+    const ctx = createToolContext(
+      withUserLookup({
+        notification: {
+          findFirst: vi.fn().mockResolvedValue(null),
+        },
+      }),
+      SystemRole.ADMIN,
+    );
+
+    const result = await executeTool(
+      "get_task_detail",
+      JSON.stringify({ taskId: "task_missing" }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: "Task not found with the given criteria.",
+    });
+  });
+});
diff --git a/packages/api/src/__tests__/assistant-tools-task-read.test.ts b/packages/api/src/__tests__/assistant-tools-task-read.test.ts
new file mode 100644
index 0000000..1476c9d
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-task-read.test.ts
@@ -0,0 +1,99 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { SystemRole } from "@capakraken/shared";
+
+vi.mock("@capakraken/application", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("@capakraken/application")>();
+  return {
+    ...actual,
+    approveEstimateVersion: vi.fn(),
+    cloneEstimate: vi.fn(),
+    commitDispoImportBatch: vi.fn(),
+    countPlanningEntries: vi.fn().mockResolvedValue({ countsByRoleId: new Map() }),
+    createEstimateExport: vi.fn(),
+    createEstimatePlanningHandoff: vi.fn(),
+    createEstimateRevision: vi.fn(),
+    assessDispoImportReadiness: vi.fn(),
+    loadResourceDailyAvailabilityContexts: vi.fn().mockResolvedValue(new Map()),
+    getDashboardDemand: vi.fn().mockResolvedValue([]),
+    getDashboardBudgetForecast: vi.fn().mockResolvedValue([]),
+    getDashboardOverview: vi.fn(),
+    getDashboardSkillGapSummary: vi.fn().mockResolvedValue({
+      roleGaps: [],
+      totalOpenPositions: 0,
+      skillSupplyTop10: [],
+      resourcesByRole: [],
+    }),
+    getDashboardProjectHealth: vi.fn().mockResolvedValue([]),
+    getDashboardPeakTimes: vi.fn().mockResolvedValue([]),
+    getDashboardTopValueResources: vi.fn().mockResolvedValue([]),
+    getEstimateById: vi.fn(),
+    listAssignmentBookings: vi.fn().mockResolvedValue([]),
+    stageDispoImportBatch: vi.fn(),
+    submitEstimateVersion: vi.fn(),
+    updateEstimateDraft: vi.fn(),
+  };
+});
+
+import { executeTool } from "../router/assistant-tools.js";
+import { createToolContext } from "./assistant-tools-audit-task-test-helpers.js";
+
+describe("assistant task read tools", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("returns task lists and counts for the current user through the notification router", async () => {
+    const db = {
+      user: {
+        findUnique: vi.fn().mockResolvedValue({ id: "user_1" }),
+      },
+      notification: {
+        findMany: vi.fn().mockResolvedValue([
+          {
+            id: "task_1",
+            title: "Approve vacation",
+            category: "APPROVAL",
+            taskStatus: "OPEN",
+            priority: "HIGH",
+          },
+        ]),
+        groupBy: vi.fn().mockResolvedValue([
+          { taskStatus: "OPEN", _count: 2 },
+          { taskStatus: "IN_PROGRESS", _count: 1 },
+        ]),
+        count: vi.fn().mockResolvedValue(1),
+      },
+    };
+    const ctx = createToolContext(db, { userRole: SystemRole.CONTROLLER });
+
+    const listResult = await executeTool(
+      "list_tasks",
+      JSON.stringify({ status: "OPEN", includeAssigned: false, limit: 10 }),
+      ctx,
+    );
+    const countsResult = await executeTool("get_task_counts", "{}", ctx);
+
+    expect(db.notification.findMany).toHaveBeenCalledWith({
+      where: {
+        userId: "user_1",
+        category: { in: ["TASK", "APPROVAL"] },
+        taskStatus: "OPEN",
+      },
+      orderBy: [{ priority: "desc" }, { dueDate: "asc" }, { createdAt: "desc" }],
+      take: 10,
+    });
+    expect(JSON.parse(listResult.content)).toEqual([
+      expect.objectContaining({
+        id: "task_1",
+        title: "Approve vacation",
+      }),
+    ]);
+    expect(JSON.parse(countsResult.content)).toEqual({
+      open: 2,
+      inProgress: 1,
+      done: 0,
+      dismissed: 0,
+      overdue: 1,
+    });
+  });
+});
diff --git a/packages/api/src/__tests__/assistant-tools-task-workflow-test-helpers.ts b/packages/api/src/__tests__/assistant-tools-task-workflow-test-helpers.ts
new file mode 100644
index 0000000..3f43fd4
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-task-workflow-test-helpers.ts
@@ -0,0 +1,17 @@
+import { vi } from "vitest";
+
+vi.mock("@capakraken/application", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("@capakraken/application")>();
+  return {
+    ...actual,
+    getDashboardBudgetForecast: vi.fn().mockResolvedValue([]),
+    getDashboardPeakTimes: vi.fn().mockResolvedValue([]),
+    listAssignmentBookings: vi.fn().mockResolvedValue([]),
+  };
+});
+
+import { executeTool as executeAssistantTool } from "../router/assistant-tools.js";
+
+export { createToolContext, withUserLookup } from "./assistant-tools-notification-test-helpers.js";
+
+export const executeTool = executeAssistantTool;