diff --git a/packages/api/src/__tests__/assistant-tools-country-get.test.ts b/packages/api/src/__tests__/assistant-tools-country-get.test.ts
new file mode 100644
index 0000000..f9e5f83
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-country-get.test.ts
@@ -0,0 +1,141 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { PermissionKey } from "@capakraken/shared";
+
+import { executeTool } from "../router/assistant-tools.js";
+import { createToolContext } from "./assistant-tools-country-test-helpers.js";
+
+describe("assistant country get tools", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("gets a country by identifier and falls back from id to code and name lookup", async () => {
+    const db = {
+      country: {
+        findUnique: vi.fn().mockResolvedValue(null),
+        findFirst: vi
+          .fn()
+          .mockResolvedValueOnce({
+            id: "country_es",
+            code: "ES",
+            name: "Spain",
+            dailyWorkingHours: 8,
+            scheduleRules: {
+              type: "spain",
+              fridayHours: 6.5,
+              summerPeriod: { from: "07-01", to: "09-15" },
+              summerHours: 6.5,
+              regularHours: 9,
+            },
+            isActive: true,
+            metroCities: [{ id: "city_mad", name: "Madrid" }],
+            _count: { resources: 4 },
+          })
+          .mockResolvedValueOnce(null)
+          .mockResolvedValueOnce({
+            id: "country_de",
+            code: "DE",
+            name: "Germany",
+            dailyWorkingHours: 8,
+            scheduleRules: null,
+            isActive: true,
+            metroCities: [{ id: "city_muc", name: "Munich" }],
+            _count: { resources: 12 },
+          }),
+      },
+    };
+    const ctx = createToolContext(db, [PermissionKey.VIEW_ALL_RESOURCES]);
+
+    const result = await executeTool(
+      "get_country",
+      JSON.stringify({ identifier: "ES" }),
+      ctx,
+    );
+
+    const parsed = JSON.parse(result.content) as {
+      code: string;
+      resourceCount: number | null;
+      scheduleRules: { type: string };
+      metroCities: Array<{ name: string }>;
+    };
+
+    expect(parsed).toMatchObject({
+      code: "ES",
+      resourceCount: 4,
+      scheduleRules: { type: "spain" },
+      metroCities: [{ name: "Madrid" }],
+    });
+
+    const fallbackResult = await executeTool(
+      "get_country",
+      JSON.stringify({ identifier: "Germany" }),
+      ctx,
+    );
+
+    expect(db.country.findUnique).toHaveBeenNthCalledWith(1, {
+      where: { id: "ES" },
+      include: {
+        metroCities: { orderBy: { name: "asc" } },
+        _count: { select: { resources: true } },
+      },
+    });
+    expect(db.country.findUnique).toHaveBeenNthCalledWith(2, {
+      where: { id: "Germany" },
+      include: {
+        metroCities: { orderBy: { name: "asc" } },
+        _count: { select: { resources: true } },
+      },
+    });
+    expect(db.country.findFirst).toHaveBeenNthCalledWith(1, {
+      where: { code: { equals: "ES", mode: "insensitive" } },
+      include: {
+        metroCities: { orderBy: { name: "asc" } },
+        _count: { select: { resources: true } },
+      },
+    });
+    expect(db.country.findFirst).toHaveBeenNthCalledWith(2, {
+      where: { code: { equals: "GERMANY", mode: "insensitive" } },
+      include: {
+        metroCities: { orderBy: { name: "asc" } },
+        _count: { select: { resources: true } },
+      },
+    });
+    expect(db.country.findFirst).toHaveBeenNthCalledWith(3, {
+      where: { name: { equals: "Germany", mode: "insensitive" } },
+      include: {
+        metroCities: { orderBy: { name: "asc" } },
+        _count: { select: { resources: true } },
+      },
+    });
+    expect(JSON.parse(fallbackResult.content)).toEqual({
+      id: "country_de",
+      code: "DE",
+      name: "Germany",
+      dailyWorkingHours: 8,
+      scheduleRules: null,
+      isActive: true,
+      resourceCount: 12,
+      metroCities: [{ id: "city_muc", name: "Munich" }],
+      cities: ["Munich"],
+    });
+  });
+
+  it("returns a stable error when a country cannot be resolved", async () => {
+    const ctx = createToolContext({
+      country: {
+        findUnique: vi.fn().mockResolvedValue(null),
+        findFirst: vi.fn().mockResolvedValue(null),
+      },
+    }, [PermissionKey.VIEW_ALL_RESOURCES]);
+
+    const result = await executeTool(
+      "get_country",
+      JSON.stringify({ identifier: "Atlantis" }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: "Country not found with the given criteria.",
+    });
+  });
+});
diff --git a/packages/api/src/__tests__/assistant-tools-country-list.test.ts b/packages/api/src/__tests__/assistant-tools-country-list.test.ts
new file mode 100644
index 0000000..98123cc
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-country-list.test.ts
@@ -0,0 +1,67 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+import { executeTool } from "../router/assistant-tools.js";
+import { createToolContext } from "./assistant-tools-country-test-helpers.js";
+
+describe("assistant country list tools", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("lists countries with schedule rules, active state, and metro cities", async () => {
+    const findMany = vi.fn().mockResolvedValue([
+      {
+        id: "country_de",
+        code: "DE",
+        name: "Deutschland",
+        dailyWorkingHours: 8,
+        scheduleRules: null,
+        isActive: true,
+        metroCities: [{ id: "city_muc", name: "Munich" }],
+      },
+      {
+        id: "country_es",
+        code: "ES",
+        name: "Spain",
+        dailyWorkingHours: 8,
+        scheduleRules: null,
+        isActive: true,
+        metroCities: [{ id: "city_mad", name: "Madrid" }],
+      },
+    ]);
+    const ctx = createToolContext({
+      country: {
+        findMany,
+      },
+    });
+
+    const result = await executeTool(
+      "list_countries",
+      JSON.stringify({ search: "deu" }),
+      ctx,
+    );
+
+    const parsed = JSON.parse(result.content) as {
+      count: number;
+      countries: Array<{
+        code: string;
+        isActive: boolean;
+        metroCities: Array<{ id: string; name: string }>;
+        cities: string[];
+      }>;
+    };
+
+    expect(findMany).toHaveBeenCalledWith({
+      where: { isActive: true },
+      include: { metroCities: { orderBy: { name: "asc" } } },
+      orderBy: { name: "asc" },
+    });
+    expect(parsed.count).toBe(1);
+    expect(parsed.countries[0]).toMatchObject({
+      code: "DE",
+      isActive: true,
+      cities: ["Munich"],
+      metroCities: [{ id: "city_muc", name: "Munich" }],
+    });
+  });
+});
diff --git a/packages/api/src/__tests__/assistant-tools-country-mutations-errors.test.ts b/packages/api/src/__tests__/assistant-tools-country-mutations-errors.test.ts
new file mode 100644
index 0000000..e5c18fe
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-country-mutations-errors.test.ts
@@ -0,0 +1,65 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { SystemRole } from "@capakraken/shared";
+
+import { executeTool } from "../router/assistant-tools.js";
+import { createToolContext } from "./assistant-tools-country-test-helpers.js";
+
+describe("assistant country mutation tools - errors", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("returns a stable error when creating a country with a duplicate code", async () => {
+    const ctx = createToolContext({
+      country: {
+        findUnique: vi.fn().mockResolvedValue({
+          id: "country_es_existing",
+          code: "ES",
+          name: "Existing Spain",
+        }),
+      },
+    });
+
+    const result = await executeTool(
+      "create_country",
+      JSON.stringify({ code: "ES", name: "Spain", dailyWorkingHours: 8 }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: "A country with this code already exists.",
+    });
+  });
+
+  it("returns a stable error when updating a missing country", async () => {
+    const ctx = createToolContext({
+      country: {
+        findUnique: vi.fn().mockResolvedValue(null),
+      },
+    });
+
+    const result = await executeTool(
+      "update_country",
+      JSON.stringify({ id: "country_missing", data: { name: "Atlantis" } }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: "Country not found with the given criteria.",
+    });
+  });
+
+  it("refuses country mutations for non-admin users", async () => {
+    const ctx = createToolContext({ country: {} }, [], SystemRole.MANAGER);
+
+    const result = await executeTool(
+      "create_country",
+      JSON.stringify({ code: "ES", name: "Spain" }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: "You do not have permission to perform this action.",
+    });
+  });
+});
diff --git a/packages/api/src/__tests__/assistant-tools-country-mutations-success.test.ts b/packages/api/src/__tests__/assistant-tools-country-mutations-success.test.ts
new file mode 100644
index 0000000..82847e4
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-country-mutations-success.test.ts
@@ -0,0 +1,95 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+import { executeTool } from "../router/assistant-tools.js";
+import { createToolContext } from "./assistant-tools-country-test-helpers.js";
+
+describe("assistant country mutation tools - success", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("creates a country for admin users and returns an invalidation action", async () => {
+    const ctx = createToolContext({
+      country: {
+        findUnique: vi.fn().mockResolvedValue(null),
+        create: vi.fn().mockResolvedValue({
+          id: "country_es",
+          code: "ES",
+          name: "Spain",
+          dailyWorkingHours: 8,
+          scheduleRules: null,
+          isActive: true,
+          metroCities: [],
+          _count: { resources: 0 },
+        }),
+      },
+    });
+
+    const result = await executeTool(
+      "create_country",
+      JSON.stringify({ code: "ES", name: "Spain", dailyWorkingHours: 8 }),
+      ctx,
+    );
+
+    expect(result.action).toEqual({
+      type: "invalidate",
+      scope: ["country", "resource", "holidayCalendar", "vacation"],
+    });
+    expect(result.data).toMatchObject({
+      success: true,
+      country: { code: "ES", name: "Spain" },
+    });
+  });
+
+  it("updates a country for admin users and keeps invalidation semantics stable", async () => {
+    const update = vi.fn().mockResolvedValue({
+      id: "country_es",
+      code: "ES",
+      name: "Spain Updated",
+      dailyWorkingHours: 7.5,
+      scheduleRules: { shortFriday: true },
+      isActive: false,
+      metroCities: [],
+      _count: { resources: 0 },
+    });
+    const ctx = createToolContext({
+      country: {
+        findUnique: vi.fn().mockResolvedValue({ id: "country_es", code: "ES", name: "Spain" }),
+        update,
+      },
+    });
+
+    const result = await executeTool(
+      "update_country",
+      JSON.stringify({
+        id: "country_es",
+        data: {
+          name: "Spain Updated",
+          dailyWorkingHours: 7.5,
+          scheduleRules: null,
+          isActive: false,
+        },
+      }),
+      ctx,
+    );
+
+    expect(update).toHaveBeenCalledWith({
+      where: { id: "country_es" },
+      data: {
+        name: "Spain Updated",
+        dailyWorkingHours: 7.5,
+        scheduleRules: expect.anything(),
+        isActive: false,
+      },
+      include: { metroCities: true },
+    });
+    expect(result.action).toEqual({
+      type: "invalidate",
+      scope: ["country", "resource", "holidayCalendar", "vacation"],
+    });
+    expect(result.data).toMatchObject({
+      success: true,
+      country: { id: "country_es", isActive: false, name: "Spain Updated" },
+    });
+  });
+});
diff --git a/packages/api/src/__tests__/assistant-tools-country-test-helpers.ts b/packages/api/src/__tests__/assistant-tools-country-test-helpers.ts
new file mode 100644
index 0000000..1f93663
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-country-test-helpers.ts
@@ -0,0 +1,26 @@
+import { SystemRole } from "@capakraken/shared";
+
+import type { ToolContext } from "../router/assistant-tools.js";
+
+export function createToolContext(
+  db: Record<string, unknown>,
+  permissions: string[] = [],
+  userRole: SystemRole = SystemRole.ADMIN,
+): ToolContext {
+  return {
+    db: db as ToolContext["db"],
+    userId: "user_1",
+    userRole,
+    permissions: new Set(permissions) as ToolContext["permissions"],
+    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,
+  };
+}