Advanced Trello MCP Server

Implementation Reference

• src/tools/actions.ts:183-234 (registration)

  Registration of the 'get-action-reactions' tool using server.tool(). Includes the tool name, Zod input schema, and inline handler function that fetches reactions from Trello API.

  // GET /actions/{id}/reactions - Get reactions for an Action
  server.tool(
  	'get-action-reactions',
  	{
  		actionId: z.string().describe('ID of the action'),
  		member: z.boolean().optional().describe('Include member information for reactions'),
  		emoji: z.boolean().optional().describe('Include emoji information for reactions'),
  	},
  	async ({ actionId, member, emoji }) => {
  		try {
  			if (!credentials.apiKey || !credentials.apiToken) {
  				return {
  					content: [
  						{
  							type: 'text',
  							text: 'Trello API credentials are not configured',
  						},
  					],
  					isError: true,
  				};
  			}
  
  			const url = new URL(`https://api.trello.com/1/actions/${actionId}/reactions`);
  			url.searchParams.append('key', credentials.apiKey);
  			url.searchParams.append('token', credentials.apiToken);
  			if (member !== undefined) url.searchParams.append('member', member.toString());
  			if (emoji !== undefined) url.searchParams.append('emoji', emoji.toString());
  
  			const response = await fetch(url.toString());
  			const data = await response.json();
  
  			return {
  				content: [
  					{
  						type: 'text',
  						text: JSON.stringify(data),
  					},
  				],
  			};
  		} catch (error) {
  			return {
  				content: [
  					{
  						type: 'text',
  						text: `Error getting action reactions: ${error}`,
  					},
  				],
  				isError: true,
  			};
  		}
  	}
  );

• src/tools/actions.ts:191-233 (handler)

  The tool handler function. Constructs Trello API URL for action reactions, appends credentials and optional params, fetches data, returns JSON stringified response or error message.

  async ({ actionId, member, emoji }) => {
  	try {
  		if (!credentials.apiKey || !credentials.apiToken) {
  			return {
  				content: [
  					{
  						type: 'text',
  						text: 'Trello API credentials are not configured',
  					},
  				],
  				isError: true,
  			};
  		}
  
  		const url = new URL(`https://api.trello.com/1/actions/${actionId}/reactions`);
  		url.searchParams.append('key', credentials.apiKey);
  		url.searchParams.append('token', credentials.apiToken);
  		if (member !== undefined) url.searchParams.append('member', member.toString());
  		if (emoji !== undefined) url.searchParams.append('emoji', emoji.toString());
  
  		const response = await fetch(url.toString());
  		const data = await response.json();
  
  		return {
  			content: [
  				{
  					type: 'text',
  					text: JSON.stringify(data),
  				},
  			],
  		};
  	} catch (error) {
  		return {
  			content: [
  				{
  					type: 'text',
  					text: `Error getting action reactions: ${error}`,
  				},
  			],
  			isError: true,
  		};
  	}
  }

• src/tools/actions.ts:186-190 (schema)

  Input schema using Zod: actionId (string, required), member (boolean, optional), emoji (boolean, optional).

  {
  	actionId: z.string().describe('ID of the action'),
  	member: z.boolean().optional().describe('Include member information for reactions'),
  	emoji: z.boolean().optional().describe('Include emoji information for reactions'),
  },

• src/index.ts:92-92 (registration)

  Invocation of registerActionsTools function, which registers the get-action-reactions tool (among other actions tools).

  registerActionsTools(server, credentials);