EventHorizon MCP Server

Instructions

Implementation Reference

• src/index.ts:227-247 (handler)

  MCP tool registration and inline handler function for 'unregister_from_event'. This is the primary implementation that gets the API client, calls unregisterFromEvent, and formats the response.

  server.tool(
    'unregister_from_event',
    'Unregister the current user from an event.',
    {
      event_id: z.number().describe('The ID of the event to unregister from')
    },
    async ({ event_id }) => {
      try {
        const apiClient = getClient();
        await apiClient.unregisterFromEvent(event_id);
        return {
          content: [{ type: 'text', text: `Successfully unregistered from event ${event_id}.` }]
        };
      } catch (error) {
        return {
          content: [{ type: 'text', text: `Error: ${error instanceof Error ? error.message : String(error)}` }],
          isError: true
        };
      }
    }
  );

• src/index.ts:230-232 (schema)

  Zod schema defining the input parameter 'event_id' for the tool.

  {
    event_id: z.number().describe('The ID of the event to unregister from')
  },

• src/api-client.ts:165-171 (helper)

  Helper method in EventHorizonClient that performs the actual API DELETE request to unregister the user from the event.

  async unregisterFromEvent(eventId: number): Promise<void> {
    try {
      await this.client.delete(`/api/events/${eventId}/unregister/`);
    } catch (error) {
      throw new Error(`Failed to unregister from event ${eventId}: ${getErrorMessage(error)}`);
    }
  }