diff --git a/packages/api/src/__tests__/assistant-tools-admin-crud-test-helpers.ts b/packages/api/src/__tests__/assistant-tools-admin-crud-test-helpers.ts
new file mode 100644
index 0000000..dceafe0
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-admin-crud-test-helpers.ts
@@ -0,0 +1,29 @@
+import { PermissionKey, SystemRole } from "@capakraken/shared";
+
+import type { ToolContext } from "../router/assistant-tools.js";
+
+export function createToolContext(
+  db: Record<string, unknown>,
+  options?: {
+    permissions?: PermissionKey[];
+    userRole?: SystemRole;
+  },
+): ToolContext {
+  const userRole = options?.userRole ?? SystemRole.ADMIN;
+  return {
+    db: db as ToolContext["db"],
+    userId: "user_1",
+    userRole,
+    permissions: new Set(options?.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,
+  };
+}
diff --git a/packages/api/src/__tests__/assistant-tools-resource-admin-create-persistence-errors.test.ts b/packages/api/src/__tests__/assistant-tools-resource-admin-create-persistence-errors.test.ts
new file mode 100644
index 0000000..64edff3
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-resource-admin-create-persistence-errors.test.ts
@@ -0,0 +1,106 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { PermissionKey, SystemRole } from "@capakraken/shared";
+import { TRPCError } from "@trpc/server";
+import {
+  createToolContext,
+  executeTool,
+} from "./assistant-tools-resource-admin-create-test-helpers.js";
+
+describe("assistant resource admin create tools - persistence errors", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("returns a generic assistant error when role resolution fails internally during resource creation", async () => {
+    const resourceCreate = vi.fn();
+    const ctx = createToolContext(
+      {
+        resource: {
+          findFirst: vi.fn().mockResolvedValue(null),
+          create: resourceCreate,
+        },
+        role: {
+          findUnique: vi.fn().mockRejectedValue(
+            new TRPCError({
+              code: "INTERNAL_SERVER_ERROR",
+              message: "role resolver connection exhausted",
+            }),
+          ),
+        },
+        assignment: {
+          findMany: vi.fn().mockResolvedValue([]),
+        },
+        demandRequirement: {
+          findMany: vi.fn().mockResolvedValue([]),
+        },
+      },
+      {
+        userRole: SystemRole.ADMIN,
+        permissions: [PermissionKey.MANAGE_RESOURCES],
+      },
+    );
+
+    const result = await executeTool(
+      "create_resource",
+      JSON.stringify({
+        eid: "EMP-500",
+        displayName: "Role Failure",
+        email: "role-failure@example.com",
+        lcrCents: 8000,
+        roleName: "Designer",
+      }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: "The tool could not complete due to an internal error.",
+    });
+    expect(resourceCreate).not.toHaveBeenCalled();
+  });
+
+  it("returns a stable assistant error when the selected resource role disappears before creation", async () => {
+    const resourceCreate = vi.fn().mockRejectedValue({
+      code: "P2003",
+      message: "Foreign key constraint failed",
+      meta: { field_name: "Resource_roleId_fkey" },
+    });
+    const ctx = createToolContext(
+      {
+        resource: {
+          findFirst: vi.fn().mockResolvedValue(null),
+          create: resourceCreate,
+        },
+        role: {
+          findUnique: vi.fn().mockResolvedValue({ id: "role_1", name: "Designer" }),
+          findFirst: vi.fn().mockResolvedValue(null),
+        },
+        assignment: {
+          findMany: vi.fn().mockResolvedValue([]),
+        },
+        demandRequirement: {
+          findMany: vi.fn().mockResolvedValue([]),
+        },
+      },
+      {
+        userRole: SystemRole.ADMIN,
+        permissions: [PermissionKey.MANAGE_RESOURCES],
+      },
+    );
+
+    const result = await executeTool(
+      "create_resource",
+      JSON.stringify({
+        eid: "EMP-002",
+        displayName: "Carol Danvers",
+        email: "carol@example.com",
+        lcrCents: 8000,
+        roleName: "Designer",
+      }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: "Role not found with the given criteria.",
+    });
+  });
+});
diff --git a/packages/api/src/__tests__/assistant-tools-resource-admin-create-success.test.ts b/packages/api/src/__tests__/assistant-tools-resource-admin-create-success.test.ts
new file mode 100644
index 0000000..485c566
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-resource-admin-create-success.test.ts
@@ -0,0 +1,104 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { PermissionKey, SystemRole } from "@capakraken/shared";
+import {
+  createToolContext,
+  executeTool,
+} from "./assistant-tools-resource-admin-create-test-helpers.js";
+
+describe("assistant resource admin create tools - success", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("routes resource creation through the real resource router path and writes an audit log", async () => {
+    const auditCreate = vi.fn().mockResolvedValue({ id: "audit_1" });
+    const resourceFindFirst = vi.fn().mockResolvedValue(null);
+    const resourceCreate = vi.fn().mockResolvedValue({
+      id: "res_1",
+      eid: "EMP-001",
+      displayName: "Carol Danvers",
+      email: "carol@example.com",
+      resourceRoles: [],
+    });
+    const ctx = createToolContext(
+      {
+        resource: {
+          findFirst: resourceFindFirst,
+          create: resourceCreate,
+        },
+        role: {
+          findUnique: vi.fn().mockResolvedValue({
+            id: "role_1",
+            name: "Designer",
+            _count: { resourceRoles: 0 },
+          }),
+          findFirst: vi.fn().mockResolvedValue(null),
+        },
+        country: {
+          findUnique: vi.fn().mockResolvedValue({
+            id: "country_de",
+            code: "DE",
+            name: "Germany",
+            metroCities: [],
+            _count: { resources: 0 },
+          }),
+          findFirst: vi.fn().mockResolvedValue(null),
+        },
+        orgUnit: {
+          findUnique: vi.fn().mockResolvedValue({
+            id: "ou_1",
+            name: "Delivery",
+            shortName: "DEL",
+            _count: { resources: 0 },
+          }),
+          findFirst: vi.fn().mockResolvedValue(null),
+        },
+        assignment: {
+          findMany: vi.fn().mockResolvedValue([]),
+        },
+        demandRequirement: {
+          findMany: vi.fn().mockResolvedValue([]),
+        },
+        auditLog: {
+          create: auditCreate,
+        },
+      },
+      {
+        userRole: SystemRole.ADMIN,
+        permissions: [PermissionKey.MANAGE_RESOURCES],
+      },
+    );
+
+    const result = await executeTool(
+      "create_resource",
+      JSON.stringify({
+        eid: "EMP-001",
+        displayName: "Carol Danvers",
+        email: "carol@example.com",
+        lcrCents: 8000,
+        roleName: "Designer",
+        countryCode: "DE",
+        orgUnitName: "Delivery",
+      }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual(
+      expect.objectContaining({
+        success: true,
+        message: "Created resource: Carol Danvers (EMP-001)",
+      }),
+    );
+    expect(resourceFindFirst).toHaveBeenCalled();
+    expect(resourceCreate).toHaveBeenCalledWith(
+      expect.objectContaining({
+        data: expect.objectContaining({
+          roleId: "role_1",
+          countryId: "country_de",
+          orgUnitId: "ou_1",
+        }),
+      }),
+    );
+    expect(auditCreate).toHaveBeenCalledTimes(1);
+  });
+});
diff --git a/packages/api/src/__tests__/assistant-tools-resource-admin-create-test-helpers.ts b/packages/api/src/__tests__/assistant-tools-resource-admin-create-test-helpers.ts
new file mode 100644
index 0000000..cb31c03
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-resource-admin-create-test-helpers.ts
@@ -0,0 +1,40 @@
+import { vi } from "vitest";
+
+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 as executeAssistantTool } from "../router/assistant-tools.js";
+import { createToolContext as createAdminCrudToolContext } from "./assistant-tools-admin-crud-test-helpers.js";
+
+export const executeTool = executeAssistantTool;
+export const createToolContext = createAdminCrudToolContext;
diff --git a/packages/api/src/__tests__/assistant-tools-resource-admin-create-validation-errors.test.ts b/packages/api/src/__tests__/assistant-tools-resource-admin-create-validation-errors.test.ts
new file mode 100644
index 0000000..978170c
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-resource-admin-create-validation-errors.test.ts
@@ -0,0 +1,140 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { PermissionKey, SystemRole } from "@capakraken/shared";
+import {
+  createToolContext,
+  executeTool,
+} from "./assistant-tools-resource-admin-create-test-helpers.js";
+
+describe("assistant resource admin create tools - validation errors", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("returns a stable assistant error when the role cannot be resolved during resource creation", async () => {
+    const resourceCreate = vi.fn();
+    const ctx = createToolContext(
+      {
+        resource: {
+          findFirst: vi.fn().mockResolvedValue(null),
+          create: resourceCreate,
+        },
+        role: {
+          findUnique: vi.fn().mockResolvedValue(null),
+          findFirst: vi.fn().mockResolvedValue(null),
+        },
+        assignment: {
+          findMany: vi.fn().mockResolvedValue([]),
+        },
+        demandRequirement: {
+          findMany: vi.fn().mockResolvedValue([]),
+        },
+      },
+      {
+        userRole: SystemRole.ADMIN,
+        permissions: [PermissionKey.MANAGE_RESOURCES],
+      },
+    );
+
+    const result = await executeTool(
+      "create_resource",
+      JSON.stringify({
+        eid: "EMP-404",
+        displayName: "Role Missing",
+        email: "missing@example.com",
+        lcrCents: 8000,
+        roleName: "Missing Role",
+      }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: 'Role not found: "Missing Role"',
+    });
+    expect(resourceCreate).not.toHaveBeenCalled();
+  });
+
+  it("returns a stable assistant error when creating a duplicate resource", async () => {
+    const resourceCreate = vi.fn();
+    const ctx = createToolContext(
+      {
+        resource: {
+          findFirst: vi.fn().mockResolvedValue({
+            id: "resource_existing",
+            eid: "EMP-001",
+            email: "carol@example.com",
+          }),
+          create: resourceCreate,
+        },
+        assignment: {
+          findMany: vi.fn().mockResolvedValue([]),
+        },
+        demandRequirement: {
+          findMany: vi.fn().mockResolvedValue([]),
+        },
+      },
+      {
+        userRole: SystemRole.ADMIN,
+        permissions: [PermissionKey.MANAGE_RESOURCES],
+      },
+    );
+
+    const result = await executeTool(
+      "create_resource",
+      JSON.stringify({
+        eid: "EMP-001",
+        displayName: "Carol Danvers",
+        email: "carol@example.com",
+        lcrCents: 8000,
+      }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: "A resource with this EID or email already exists.",
+    });
+    expect(resourceCreate).not.toHaveBeenCalled();
+  });
+
+  it("requires an email address before creating a resource", async () => {
+    const resourceCreate = vi.fn();
+    const roleFindUnique = vi.fn();
+    const ctx = createToolContext(
+      {
+        resource: {
+          findFirst: vi.fn().mockResolvedValue(null),
+          create: resourceCreate,
+        },
+        role: {
+          findUnique: roleFindUnique,
+          findFirst: vi.fn().mockResolvedValue(null),
+        },
+        assignment: {
+          findMany: vi.fn().mockResolvedValue([]),
+        },
+        demandRequirement: {
+          findMany: vi.fn().mockResolvedValue([]),
+        },
+      },
+      {
+        userRole: SystemRole.ADMIN,
+        permissions: [PermissionKey.MANAGE_RESOURCES],
+      },
+    );
+
+    const result = await executeTool(
+      "create_resource",
+      JSON.stringify({
+        eid: "EMP-NO-MAIL",
+        displayName: "Missing Email",
+        lcrCents: 8000,
+      }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: "email is required to create a resource.",
+    });
+    expect(roleFindUnique).not.toHaveBeenCalled();
+    expect(resourceCreate).not.toHaveBeenCalled();
+  });
+});
diff --git a/packages/api/src/__tests__/assistant-tools-resource-admin-update-deactivate.test.ts b/packages/api/src/__tests__/assistant-tools-resource-admin-update-deactivate.test.ts
new file mode 100644
index 0000000..d54cfcd
--- /dev/null
+++ b/packages/api/src/__tests__/assistant-tools-resource-admin-update-deactivate.test.ts
@@ -0,0 +1,175 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { PermissionKey, 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-admin-crud-test-helpers.js";
+
+describe("assistant resource admin update and deactivate tools", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("routes resource updates through the real resource router path and writes an audit log", async () => {
+    const auditCreate = vi.fn().mockResolvedValue({ id: "audit_1" });
+    const resourceFindUnique = vi.fn()
+      .mockResolvedValueOnce({
+        id: "res_1",
+        eid: "EMP-001",
+        displayName: "Carol Danvers",
+      })
+      .mockResolvedValueOnce({
+        id: "res_1",
+        eid: "EMP-001",
+        displayName: "Carol Danvers",
+        dynamicFields: {},
+        blueprintId: null,
+      });
+    const resourceUpdate = vi.fn().mockResolvedValue({
+      id: "res_1",
+      eid: "EMP-001",
+      displayName: "Captain Marvel",
+      resourceRoles: [],
+    });
+    const ctx = createToolContext(
+      {
+        resource: {
+          findUnique: resourceFindUnique,
+          update: resourceUpdate,
+        },
+        auditLog: {
+          create: auditCreate,
+        },
+      },
+      {
+        userRole: SystemRole.ADMIN,
+        permissions: [PermissionKey.MANAGE_RESOURCES],
+      },
+    );
+
+    const result = await executeTool(
+      "update_resource",
+      JSON.stringify({
+        id: "res_1",
+        displayName: "Captain Marvel",
+        chapter: "Delivery",
+      }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual(
+      expect.objectContaining({
+        success: true,
+        message: "Updated resource Captain Marvel (EMP-001)",
+        updatedFields: ["displayName", "chapter"],
+      }),
+    );
+    expect(resourceUpdate).toHaveBeenCalled();
+    expect(auditCreate).toHaveBeenCalledTimes(1);
+  });
+
+  it("returns a stable assistant error when the resource disappears during update", async () => {
+    const ctx = createToolContext(
+      {
+        resource: {
+          findUnique: vi.fn()
+            .mockResolvedValueOnce({
+              id: "res_1",
+              eid: "EMP-001",
+              displayName: "Carol Danvers",
+            })
+            .mockResolvedValueOnce({
+              id: "res_1",
+              eid: "EMP-001",
+              displayName: "Carol Danvers",
+              dynamicFields: {},
+              blueprintId: null,
+            }),
+          update: vi.fn().mockRejectedValue({
+            code: "P2025",
+            message: "Record to update not found.",
+          }),
+        },
+      },
+      {
+        userRole: SystemRole.ADMIN,
+        permissions: [PermissionKey.MANAGE_RESOURCES],
+      },
+    );
+
+    const result = await executeTool(
+      "update_resource",
+      JSON.stringify({ id: "res_1", displayName: "Captain Marvel" }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: "Resource not found with the given criteria.",
+    });
+  });
+
+  it("returns a stable assistant error when the resource disappears during deactivation", async () => {
+    const ctx = createToolContext(
+      {
+        resource: {
+          findUnique: vi.fn().mockResolvedValue({
+            id: "res_1",
+            eid: "EMP-001",
+            displayName: "Carol Danvers",
+          }),
+          update: vi.fn().mockRejectedValue({
+            code: "P2025",
+            message: "Record to update not found.",
+          }),
+        },
+      },
+      {
+        userRole: SystemRole.ADMIN,
+        permissions: [PermissionKey.MANAGE_RESOURCES],
+      },
+    );
+
+    const result = await executeTool(
+      "deactivate_resource",
+      JSON.stringify({ identifier: "res_1" }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: "Resource not found with the given criteria.",
+    });
+  });
+});