Trello MCP Server

Implementation Reference

• src/index.ts:383-417 (handler)

  The handler function for the 'add-label' tool. It sends a POST request to the Trello API to add a specified label to a card and returns the response or an error.

  async ({ cardId, labelId }) => {
  	try {
  		const response = await fetch(
  			`https://api.trello.com/1/cards/${cardId}/idLabels?key=${trelloApiKey}&token=${trelloApiToken}`,
  			{
  				method: 'POST',
  				headers: {
  					'Content-Type': 'application/json',
  				},
  				body: JSON.stringify({
  					value: labelId,
  				}),
  			}
  		);
  		const data = await response.json();
  		return {
  			content: [
  				{
  					type: 'text',
  					text: JSON.stringify(data),
  				},
  			],
  		};
  	} catch (error) {
  		return {
  			content: [
  				{
  					type: 'text',
  					text: `Error adding label to card: ${error}`,
  				},
  			],
  			isError: true,
  		};
  	}
  }

• src/index.ts:379-382 (schema)

  Zod input schema defining parameters for the 'add-label' tool: cardId and labelId.

  {
  	cardId: z.string().describe('ID of the card to add the label to'),
  	labelId: z.string().describe('ID of the label to add'),
  },

• src/index.ts:378-418 (registration)

  Registration of the 'add-label' tool on the MCP server using server.tool(), including schema and handler.

  	'add-label',
  	{
  		cardId: z.string().describe('ID of the card to add the label to'),
  		labelId: z.string().describe('ID of the label to add'),
  	},
  	async ({ cardId, labelId }) => {
  		try {
  			const response = await fetch(
  				`https://api.trello.com/1/cards/${cardId}/idLabels?key=${trelloApiKey}&token=${trelloApiToken}`,
  				{
  					method: 'POST',
  					headers: {
  						'Content-Type': 'application/json',
  					},
  					body: JSON.stringify({
  						value: labelId,
  					}),
  				}
  			);
  			const data = await response.json();
  			return {
  				content: [
  					{
  						type: 'text',
  						text: JSON.stringify(data),
  					},
  				],
  			};
  		} catch (error) {
  			return {
  				content: [
  					{
  						type: 'text',
  						text: `Error adding label to card: ${error}`,
  					},
  				],
  				isError: true,
  			};
  		}
  	}
  );