Trello MCP Server

Implementation Reference

• src/index.ts:548-588 (handler)

  Handler function that creates multiple labels on Trello boards using batch API calls.

  async ({ labels }) => {
  	try {
  		const results = await Promise.all(
  			labels.map(async (label) => {
  				const response = await fetch(
  					`https://api.trello.com/1/labels?key=${trelloApiKey}&token=${trelloApiToken}`,
  					{
  						method: 'POST',
  						headers: {
  							'Content-Type': 'application/json',
  						},
  						body: JSON.stringify({
  							name: label.name,
  							color: label.color,
  							idBoard: label.boardId,
  						}),
  					}
  				);
  				return await response.json();
  			})
  		);
  		return {
  			content: [
  				{
  					type: 'text',
  					text: JSON.stringify(results),
  				},
  			],
  		};
  	} catch (error) {
  		return {
  			content: [
  				{
  					type: 'text',
  					text: `Error creating labels: ${error}`,
  				},
  			],
  			isError: true,
  		};
  	}
  }

• src/index.ts:526-547 (schema)

  Input schema for the create-labels tool using Zod validation.

  {
  	labels: z.array(
  		z.object({
  			boardId: z.string().describe('ID of the board to create the label in'),
  			name: z.string().describe('Name of the label'),
  			color: z
  				.enum([
  					'yellow',
  					'purple',
  					'blue',
  					'red',
  					'green',
  					'orange',
  					'black',
  					'sky',
  					'pink',
  					'lime',
  				])
  				.describe('Color of the label'),
  		})
  	),
  },

• src/index.ts:524-589 (registration)

  Registration of the create-labels tool with server.tool, including inline schema and handler.

  server.tool(
  	'create-labels',
  	{
  		labels: z.array(
  			z.object({
  				boardId: z.string().describe('ID of the board to create the label in'),
  				name: z.string().describe('Name of the label'),
  				color: z
  					.enum([
  						'yellow',
  						'purple',
  						'blue',
  						'red',
  						'green',
  						'orange',
  						'black',
  						'sky',
  						'pink',
  						'lime',
  					])
  					.describe('Color of the label'),
  			})
  		),
  	},
  	async ({ labels }) => {
  		try {
  			const results = await Promise.all(
  				labels.map(async (label) => {
  					const response = await fetch(
  						`https://api.trello.com/1/labels?key=${trelloApiKey}&token=${trelloApiToken}`,
  						{
  							method: 'POST',
  							headers: {
  								'Content-Type': 'application/json',
  							},
  							body: JSON.stringify({
  								name: label.name,
  								color: label.color,
  								idBoard: label.boardId,
  							}),
  						}
  					);
  					return await response.json();
  				})
  			);
  			return {
  				content: [
  					{
  						type: 'text',
  						text: JSON.stringify(results),
  					},
  				],
  			};
  		} catch (error) {
  			return {
  				content: [
  					{
  						type: 'text',
  						text: `Error creating labels: ${error}`,
  					},
  				],
  				isError: true,
  			};
  		}
  	}
  );