diff --git a/src/constants.ts b/src/constants.ts
new file mode 100644
index 0000000..d226e4d
--- /dev/null
+++ b/src/constants.ts
@@ -0,0 +1,24 @@
+export const DEFAULT_API_BASE_URL = "https://api.novu.co";
+export const CHARACTER_LIMIT = 25_000;
+export const DEFAULT_PAGE_LIMIT = 20;
+export const MAX_PAGE_LIMIT = 100;
+
+export enum ResponseFormat {
+  MARKDOWN = "markdown",
+  JSON = "json",
+}
+
+export function getApiBaseUrl(): string {
+  return process.env.NOVU_API_URL || DEFAULT_API_BASE_URL;
+}
+
+export function getApiKey(): string {
+  const key = process.env.NOVU_SECRET_KEY;
+  if (!key) {
+    throw new Error(
+      "NOVU_SECRET_KEY environment variable is required. " +
+        "Get your API key from the Novu Dashboard: https://dashboard.novu.co"
+    );
+  }
+  return key;
+}
diff --git a/src/schemas/common.ts b/src/schemas/common.ts
new file mode 100644
index 0000000..6144ff7
--- /dev/null
+++ b/src/schemas/common.ts
@@ -0,0 +1,52 @@
+import { z } from "zod";
+import {
+  ResponseFormat,
+  MAX_PAGE_LIMIT,
+  DEFAULT_PAGE_LIMIT,
+} from "../constants.js";
+
+/** Offset-based pagination for v1 API */
+export const PaginationV1Schema = {
+  limit: z
+    .number()
+    .int()
+    .min(1)
+    .max(MAX_PAGE_LIMIT)
+    .default(DEFAULT_PAGE_LIMIT)
+    .describe("Maximum number of results to return (1-100)"),
+  offset: z
+    .number()
+    .int()
+    .min(0)
+    .default(0)
+    .describe("Number of results to skip for pagination"),
+};
+
+/** Cursor-based pagination for v2 API (Topics) */
+export const PaginationV2Schema = {
+  limit: z
+    .number()
+    .int()
+    .min(1)
+    .max(MAX_PAGE_LIMIT)
+    .default(DEFAULT_PAGE_LIMIT)
+    .describe("Maximum number of results to return (1-100)"),
+  after: z
+    .string()
+    .optional()
+    .describe("Cursor for fetching the next page of results"),
+  before: z
+    .string()
+    .optional()
+    .describe("Cursor for fetching the previous page of results"),
+};
+
+/** Response format param */
+export const ResponseFormatSchema = {
+  response_format: z
+    .nativeEnum(ResponseFormat)
+    .default(ResponseFormat.JSON)
+    .describe(
+      "Output format: 'json' for structured data or 'markdown' for human-readable"
+    ),
+};
diff --git a/src/types.ts b/src/types.ts
new file mode 100644
index 0000000..8a60e80
--- /dev/null
+++ b/src/types.ts
@@ -0,0 +1,66 @@
+/** Standard v1 paginated list response wrapper */
+export interface PaginatedListV1<T> {
+  data: T[];
+  totalCount: number;
+  pageSize: number;
+  page: number;
+  hasMore: boolean;
+}
+
+/** Standard v2 cursor-based paginated response (used by Topics) */
+export interface PaginatedListV2<T> {
+  data: T[];
+  next: string | null;
+  previous: string | null;
+  totalCount: number;
+  totalCountCapped: boolean;
+}
+
+/** Subscriber shape from Novu API */
+export interface Subscriber {
+  id?: string;
+  subscriberId?: string;
+  firstName?: string | null;
+  lastName?: string | null;
+  email?: string | null;
+  phone?: string | null;
+  avatar?: string | null;
+  locale?: string | null;
+  timezone?: string | null;
+  data?: Record<string, unknown> | null;
+  isOnline?: boolean | null;
+  lastOnlineAt?: string | null;
+  createdAt?: string;
+  updatedAt?: string;
+}
+
+/** Topic shape */
+export interface Topic {
+  _id: string;
+  key: string;
+  name?: string;
+  createdAt?: string;
+  updatedAt?: string;
+}
+
+/** Workflow shape */
+export interface Workflow {
+  id?: string;
+  name?: string;
+  description?: string;
+  active?: boolean;
+  draft?: boolean;
+  tags?: string[];
+  steps?: unknown[];
+  triggers?: unknown[];
+  createdAt?: string;
+  updatedAt?: string;
+}
+
+/** Trigger event response */
+export interface TriggerResponse {
+  acknowledged: boolean;
+  status: string;
+  error?: string[];
+  transactionId?: string;
+}