Types

interface AuthInfo {
  token: string;
  provider: string;
}
 
interface ToolContext<
  TInput,
  TSecrets extends string = string,
  TAuth extends boolean = false
> {
  /** Validated input matching your Zod schema */
  input: TInput;
 
  /** OAuth token and provider — non-optional when requiresAuth is set */
  authorization: TAuth extends true ? AuthInfo : AuthInfo | undefined;
 
  /**
   * Get a secret value. Only keys declared in requiresSecrets are allowed.
   * Validated at startup — guaranteed to exist at runtime.
   */
  getSecret(key: TSecrets): string;
 
  /** Metadata from the client (if requiresMetadata was set) */
  metadata: Record<string, unknown>;
}

import { z } from 'zod';
import { Google } from 'arcade-mcp/auth';
 
// Without requiresAuth: authorization is optional
app.tool('publicTool', {
  input: z.object({ query: z.string() }),
  handler: ({ authorization }) => {
    authorization?.token;  // Must use optional chaining
  },
});
 
// With requiresAuth: authorization is guaranteed
app.tool('privateTool', {
  input: z.object({ query: z.string() }),
  requiresAuth: Google({ scopes: ['profile'] }),
  handler: ({ authorization }) => {
    authorization.token;  // ✅ No optional chaining needed
  },
});

app.tool('search', {
  input: z.object({ query: z.string() }),
  requiresSecrets: ['API_KEY'] as const,
  handler: ({ getSecret }) => {
    getSecret('API_KEY');  // ✅ Autocomplete works
    // getSecret('OTHER'); // ❌ TypeScript error
  },
});

import { z } from 'zod';
 
const searchInput = z.object({
  query: z.string(),
  limit: z.number().int().min(1).max(100).default(10),
  filters: z.object({
    category: z.enum(['all', 'docs', 'code']).optional(),
    after: z.coerce.date().optional(),  // Coerces ISO strings to Date
  }).optional(),
});
 
app.tool('search', {
  input: searchInput,
  handler: ({ input }) => {
    // TypeScript knows:
    // - input.query is string
    // - input.limit is number (default applied)
    // - input.filters?.category is 'all' | 'docs' | 'code' | undefined
    // - input.filters?.after is Date | undefined
    return search(input);
  },
});

type ContentItem = TextContent | ImageContent | ResourceContent;
 
interface TextContent {
  type: 'text';
  text: string;
}
 
interface ImageContent {
  type: 'image';
  data: string;      // Base64 encoded
  mimeType: string;  // e.g., 'image/png'
}
 
interface ResourceContent {
  type: 'resource';
  uri: string;
  mimeType?: string;
  text?: string;
  blob?: string;  // Base64 encoded
}

import { z } from 'zod';
 
app.tool('screenshot', {
  input: z.object({}),
  handler: async () => {
    const screenshot = await captureScreen();
    return {
      content: [{
        type: 'image',
        data: screenshot.toBase64(),
        mimeType: 'image/png',
      }],
    };
  },
});

interface CallToolResult {
  /** Content items to return to the client */
  content: ContentItem[];
 
  /** Optional structured data (for programmatic access) */
  structuredContent?: Record<string, unknown>;
 
  /** Whether this result represents an error */
  isError?: boolean;
}

import { z } from 'zod';
 
const schema = z.object({
  firstName: z.string().describe('Your first name'),
  lastName: z.string().meta({ title: 'last_name' }),
  age: z.number().meta({ examples: [12, 99] }),
});
 
z.toJSONSchema(schema);
// => {
//   type: 'object',
//   properties: {
//     firstName: { type: 'string', description: 'Your first name' },
//     lastName: { type: 'string', title: 'last_name' },
//     age: { type: 'number', examples: [12, 99] }
//   },
//   required: ['firstName', 'lastName', 'age']
// }

// Simple description (Zod 3 compatible)
z.string().describe('User email address');
 
// Rich metadata (Zod 4)
z.string().meta({
  id: 'email_address',
  title: 'Email',
  description: 'User email address',
  examples: ['user@example.com'],
});
 
// .describe() is shorthand for .meta({ description: ... })
z.string().describe('An email');
// equivalent to:
z.string().meta({ description: 'An email' });

import { z } from 'zod';
 
const userSchema = z.object({
  id: z.string().uuid(),
  name: z.string(),
  email: z.string().email(),
  role: z.enum(['admin', 'user', 'guest']),
});
 
// Extract the type
type User = z.infer<typeof userSchema>;
 
// Use in your code
function processUser(user: User) {
  // user.id is string
  // user.role is 'admin' | 'user' | 'guest'
}

type MCPMessage = JSONRPCRequest | JSONRPCResponse | JSONRPCNotification;
 
interface JSONRPCRequest {
  jsonrpc: '2.0';
  id: string | number;
  method: string;
  params?: Record<string, unknown>;
}
 
interface JSONRPCResponse {
  jsonrpc: '2.0';
  id: string | number;
  result?: unknown;
  error?: {
    code: number;
    message: string;
    data?: unknown;
  };
}
 
interface JSONRPCNotification {
  jsonrpc: '2.0';
  method: string;
  params?: Record<string, unknown>;
}

interface ServerSession {
  /** Unique session identifier */
  id: string;
 
  /** Client information (if provided during initialization) */
  clientInfo?: {
    name: string;
    version: string;
  };
 
  /** Client capabilities (tools, resources, prompts support) */
  capabilities?: Record<string, unknown>;
}

interface SessionMessage {
  message: MCPMessage;
  session: ServerSession;
}

interface AuthProvider {
  /** Provider identifier (e.g., 'google', 'github') */
  provider: string;
 
  /** OAuth scopes required */
  scopes: readonly string[];
}

import { Google, GitHub, Slack } from 'arcade-mcp/auth';
 
// Google with specific scopes
Google({ scopes: ['profile', 'email'] })
 
// GitHub with repo access
GitHub({ scopes: ['repo', 'user'] })
 
// Slack
Slack({ scopes: ['chat:write', 'users:read'] })

interface ErrorAdapter {
  /** Identifier for logging/metrics */
  slug: string;
 
  /** Translate an exception into an Arcade error, or null if not handled */
  fromException(error: unknown): MCPError | null;
}

import {
  SlackErrorAdapter,
  GoogleErrorAdapter,
  MicrosoftGraphErrorAdapter,
  HTTPErrorAdapter,
  GraphQLErrorAdapter,
} from 'arcade-mcp/adapters';
 
app.tool('sendMessage', {
  input: z.object({ channel: z.string(), text: z.string() }),
  adapters: [new SlackErrorAdapter()],
  handler: async ({ input }) => {
    // SlackApiError → UpstreamError automatically
    await slack.chat.postMessage(input);
    return 'Sent!';
  },
});

import { tool } from 'arcade-mcp';
import { z } from 'zod';
 
const myTool = tool({
  name: 'my-tool',  // required for runtime registration
  description: 'Does something',
  input: z.object({ value: z.string() }),
  handler: ({ input }) => `Got: ${input.value}`,
});
 
// Use with runtime APIs
await app.tools.add(myTool);
await server.tools.add(myTool);

interface ToolOptions<
  TInput,
  TSecrets extends string = string,
  TAuth extends AuthProvider | undefined = undefined
> {
  description?: string;
  input: z.ZodType<TInput>;
  handler: (
    context: ToolContext<TInput, TSecrets, TAuth extends AuthProvider ? true : false>
  ) => unknown | Promise<unknown>;
  requiresAuth?: TAuth;
  requiresSecrets?: readonly TSecrets[];
  requiresMetadata?: string[];
  adapters?: ErrorAdapter[];
}

interface MCPAppOptions {
  name?: string;
  version?: string;
  title?: string;
  instructions?: string;
  logLevel?: 'DEBUG' | 'INFO' | 'WARNING' | 'ERROR';
  transport?: 'stdio' | 'http';
  host?: string;
  port?: number;
  reload?: boolean;
  cors?: CorsOptions;
}

interface CorsOptions {
  origin?: string | string[] | boolean;
  methods?: string[];
  allowedHeaders?: string[];
  exposedHeaders?: string[];
  credentials?: boolean;
  maxAge?: number;
}