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generate-frontend-client

Create TypeScript clients for frontend applications to interact with backend API endpoints, simplifying API integration and type-safe communication.

Instructions

Generate a TypeScript client for frontend apps that calls your backend API endpoints

Input Schema

TableJSON Schema

Name	Required	Description	Default
`typesImportPath`	No	Import path for types file (optional, defaults to "../types")

Implementation Reference

src/server.ts:54-66 (registration)

Registration of the 'generate-frontend-client' tool in the TOOLS array, including name, description, and inputSchema.

{
  name: 'generate-frontend-client',
  description: 'Generate a TypeScript client for frontend apps that calls your backend API endpoints',
  inputSchema: {
    type: 'object',
    properties: {
      typesImportPath: {
        type: 'string',
        description: 'Import path for types file (optional, defaults to "../types")',
      },
    },
  },
},

src/server.ts:127-140 (handler)

Dispatch handler in the CallToolRequestSchema switch statement that invokes generateFrontendClient and returns the generated code.

case 'generate-frontend-client': {
  const code = generateFrontendClient({
    typesImportPath: args?.typesImportPath as string | undefined,
  });

  return {
    content: [
      {
        type: 'text',
        text: code,
      },
    ],
  };
}

src/generators/client.ts:231-554 (handler)

Core handler function that generates the complete TypeScript frontend API client code as a large template string literal, including all endpoint functions with fetch calls to backend routes.

export function generateFrontendClient(options?: { typesImportPath?: string }): string {
  const typesPath = options?.typesImportPath || '../types';

  return `import * as Types from '${typesPath}';
import { convertToLocalTime } from '@kalendis/utils';

export const api = {
  getUsers: async (): Promise<Types.User[]> => {
    const response = await fetch('/api/users');
    if (!response.ok) throw new Error('Failed to fetch users');
    return response.json();
  },

  createUser: async (data: { id: string; name: string; email?: string; timezone?: string }): Promise<Types.User> => {
    const response = await fetch('/api/users', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data)
    });
    if (!response.ok) throw new Error('Failed to create user');
    return response.json();
  },

  updateUser: async (data: { id: string; name?: string; timezone?: string }): Promise<Types.User> => {
    const response = await fetch(\`/api/users/\${data.id}\`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data)
    });
    if (!response.ok) throw new Error('Failed to update user');
    return response.json();
  },

  deleteUser: async (id: string): Promise<Types.User> => {
    const response = await fetch(\`/api/users/\${id}\`, {
      method: 'DELETE'
    });
    if (!response.ok) throw new Error('Failed to delete user');
    return response.json();
  },

  getAvailability: async (params?: { userId?: string; start?: string; end?: string }): Promise<Types.Availability[]> => {
    const query = new URLSearchParams(params as any).toString();
    const response = await fetch('/api/availability' + (query ? '?' + query : ''));
    if (!response.ok) throw new Error('Failed to fetch availability');
    const data = await response.json();
    return convertToLocalTime(data);
  },

  getAllAvailability: async (params: { start: string; end?: string; timezone?: string }): Promise<Array<{userId: string; start: string; end: string}>> => {
    const query = new URLSearchParams(params as any).toString();
    const response = await fetch('/api/availability/all?' + query);
    if (!response.ok) throw new Error('Failed to fetch all availability');
    const data = await response.json();
    return convertToLocalTime(data);
  },

  getMultiUserCalculatedAvailability: async (data: {
    userIds: string[];
    start: string;
    end?: string;
    timezone?: string;
  }): Promise<Array<{userId: string; availability: Array<{start: string; end: string; offset: number}>}>> => {
    const response = await fetch('/api/availability/calculated', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data)
    });
    if (!response.ok) throw new Error('Failed to fetch calculated availability');
    const responseData = await response.json();
    return convertToLocalTime(responseData);
  },

  getRecurringAvailabilityByDate: async (data: {
    userId: string;
    start: string;
    cadence: string;
    frequency: number;
    numberOfOccurrences: number;
    timezone?: string;
  }): Promise<Array<Array<{start: string; end: string; offset: number}>>> => {
    const response = await fetch('/api/availability/recurring', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data)
    });
    if (!response.ok) throw new Error('Failed to fetch recurring availability');
    const responseData = await response.json();
    return convertToLocalTime(responseData);
  },

  getMatchingAvailabilityByDate: async (data: {
    userIds: string[];
    start: string;
    end?: string;
    timezone?: string;
  }): Promise<Array<{start: string; end: string}>> => {
    const response = await fetch('/api/availability/matching', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data)
    });
    if (!response.ok) throw new Error('Failed to fetch matching availability');
    const responseData = await response.json();
    return convertToLocalTime(responseData);
  },

  addAvailability: async (data: { userId: string; start: string; end: string; timezone?: string }): Promise<Types.Availability> => {
    const response = await fetch('/api/availability', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data)
    });
    if (!response.ok) throw new Error('Failed to add availability');
    const responseData = await response.json();
    return convertToLocalTime(responseData);
  },

  updateAvailability: async (data: { id: string; start?: string; end?: string; timezone?: string }): Promise<Types.Availability> => {
    const response = await fetch(\`/api/availability/\${data.id}\`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data)
    });
    if (!response.ok) throw new Error('Failed to update availability');
    const responseData = await response.json();
    return convertToLocalTime(responseData);
  },

  deleteAvailability: async (id: string, userId: string): Promise<{message: string}> => {
    const response = await fetch(\`/api/availability/\${id}?userId=\${userId}\`, {
      method: 'DELETE'
    });
    if (!response.ok) throw new Error('Failed to delete availability');
    return response.json();
  },

  getRecurringAvailability: async (userId: string): Promise<Types.RecurringAvailability[]> => {
    const response = await fetch(\`/api/recurring-availability?userId=\${userId}\`);
    if (!response.ok) throw new Error('Failed to fetch recurring availability');
    const responseData = await response.json();
    return convertToLocalTime(responseData);
  },

  addRecurringAvailability: async (data: {
    userId: string;
    daysOfWeek: Types.DaysOfWeek[];
    start: string;
    end: string;
    expiration?: string;
    timezone?: string;
  }): Promise<Types.RecurringAvailability> => {
    const response = await fetch('/api/recurring-availability', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data)
    });
    if (!response.ok) throw new Error('Failed to add recurring availability');
    const responseData = await response.json();
    return convertToLocalTime(responseData);
  },

  updateRecurringAvailability: async (data: {
    id: string;
    userId: string;
    daysOfWeek?: Types.DaysOfWeek[];
    start?: string;
    end?: string;
    expiration?: string;
    makeInfinite?: boolean;
    timezone?: string;
  }): Promise<Types.RecurringAvailability> => {
    const response = await fetch(\`/api/recurring-availability/\${data.id}\`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data)
    });
    if (!response.ok) throw new Error('Failed to update recurring availability');
    const responseData = await response.json();
    return convertToLocalTime(responseData);
  },

  deleteRecurringAvailability: async (id: string, userId: string): Promise<{message: string}> => {
    const response = await fetch(\`/api/recurring-availability/\${id}?userId=\${userId}\`, {
      method: 'DELETE'
    });
    if (!response.ok) throw new Error('Failed to delete recurring availability');
    return response.json();
  },

  getAvailabilityException: async (userId: string): Promise<Types.AvailabilityException[]> => {
    const response = await fetch(\`/api/availability-exceptions?userId=\${userId}\`);
    if (!response.ok) throw new Error('Failed to fetch availability exceptions');
    const responseData = await response.json();
    return convertToLocalTime(responseData);
  },

  addAvailabilityException: async (data: {
    userId: string;
    start: string;
    end: string;
    timezone?: string;
  }): Promise<Types.AvailabilityException> => {
    const response = await fetch('/api/availability-exceptions', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data)
    });
    if (!response.ok) throw new Error('Failed to add availability exception');
    const responseData = await response.json();
    return convertToLocalTime(responseData);
  },

  addRecurringAvailabilityException: async (data: {
    userId: string;
    daysOfWeek: Types.DaysOfWeek[];
    start: string;
    end: string;
    expiration?: string;
    timezone?: string;
  }): Promise<Types.AvailabilityException[]> => {
    const response = await fetch('/api/availability-exceptions/recurring', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data)
    });
    if (!response.ok) throw new Error('Failed to add recurring availability exception');
    const responseData = await response.json();
    return convertToLocalTime(responseData);
  },

  updateAvailabilityException: async (data: {
    id: string;
    start?: string;
    end?: string;
    timezone?: string;
  }): Promise<Types.AvailabilityException> => {
    const response = await fetch(\`/api/availability-exceptions/\${data.id}\`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data)
    });
    if (!response.ok) throw new Error('Failed to update availability exception');
    const responseData = await response.json();
    return convertToLocalTime(responseData);
  },

  deleteAvailabilityException: async (id: string, userId: string): Promise<{message: string}> => {
    const response = await fetch(\`/api/availability-exceptions/\${id}?userId=\${userId}\`, {
      method: 'DELETE'
    });
    if (!response.ok) throw new Error('Failed to delete availability exception');
    return response.json();
  },

  getBookings: async (params: { userId: string; start: string; end?: string }): Promise<Types.Booking[]> => {
    const query = new URLSearchParams(params as any).toString();
    const response = await fetch('/api/bookings?' + query);
    if (!response.ok) throw new Error('Failed to fetch bookings');
    const responseData = await response.json();
    return convertToLocalTime(responseData);
  },

  getBookingsByIds: async (bookingIds: string[]): Promise<Types.Booking[]> => {
    const response = await fetch('/api/bookings/bulk', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ bookingIds })
    });
    if (!response.ok) throw new Error('Failed to fetch bookings');
    const responseData = await response.json();
    return convertToLocalTime(responseData);
  },

  createBooking: async (data: { userIds: string[]; start: string; end: string; timezone?: string }): Promise<Types.Booking> => {
    const response = await fetch('/api/bookings', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data)
    });
    if (!response.ok) throw new Error('Failed to create booking');
    const responseData = await response.json();
    return convertToLocalTime(responseData);
  },

  updateBooking: async (data: { id: string; userIds?: string[]; start?: string; end?: string; timezone?: string }): Promise<Types.Booking> => {
    const response = await fetch(\`/api/bookings/\${data.id}\`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data)
    });
    if (!response.ok) throw new Error('Failed to update booking');
    const responseData = await response.json();
    return convertToLocalTime(responseData);
  },

  deleteBooking: async (id: string): Promise<{message: string}> => {
    const response = await fetch(\`/api/bookings/\${id}\`, {
      method: 'DELETE'
    });
    if (!response.ok) throw new Error('Failed to delete booking');
    return response.json();
  },

  getAccount: async (): Promise<Types.Account> => {
    const response = await fetch('/api/account');
    if (!response.ok) throw new Error('Failed to fetch account');
    return response.json();
  },

  updateAccount: async (data: { name?: string; active?: boolean }): Promise<Types.Account> => {
    const response = await fetch('/api/account', {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(data)
    });
    if (!response.ok) throw new Error('Failed to update account');
    return response.json();
  }
};

export default api;
`;
}

Tool Definition Quality

C2.9/5.0

Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full burden of behavioral disclosure. While it indicates this is a generation tool (implying a write operation), it lacks details on permissions needed, whether it overwrites existing files, what the output format is, or any rate limits. The description is minimal and doesn't provide sufficient behavioral context for safe use.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence that directly states the tool's purpose without unnecessary words. It's appropriately sized and front-loaded, with every element contributing to understanding.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a generation tool with no annotations and no output schema, the description is incomplete. It doesn't explain what the generated client includes, how it's structured, where it's saved, or what happens if files already exist. Given the complexity implied by generating a TypeScript client, more context is needed for effective use.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema fully documents the single optional parameter. The description doesn't add any parameter-specific information beyond what's in the schema, but with high coverage and only one parameter, the baseline score of 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose: 'Generate a TypeScript client for frontend apps that calls your backend API endpoints'. It specifies the verb ('Generate'), resource ('TypeScript client'), and target context ('frontend apps'), but doesn't explicitly differentiate from sibling tools like 'generate-backend-client' or 'generate-api-routes'.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention sibling tools like 'generate-backend-client' or 'generate-api-routes', nor does it specify prerequisites, appropriate contexts, or exclusions for usage.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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