harvest-mcp-server

Instructions

Implementation Reference

• src/tools/expenses.ts:39-57 (handler)

  The GetExpenseHandler class contains the execution logic for the get_expense MCP tool. It validates the input and calls the harvestClient to fetch the expense.

  class GetExpenseHandler implements ToolHandler {
    constructor(private readonly config: BaseToolConfig) {}
  
    async execute(args: Record<string, any>): Promise<CallToolResult> {
      try {
        const inputSchema = z.object({ expense_id: z.number().int().positive() });
        const { expense_id } = validateInput(inputSchema, args, 'get expense');
        
        logger.info('Fetching expense from Harvest API', { expenseId: expense_id });
        const expense = await this.config.harvestClient.getExpense(expense_id);
        
        return {
          content: [{ type: 'text', text: JSON.stringify(expense, null, 2) }],
        };
      } catch (error) {
        return handleMCPToolError(error, 'get_expense');
      }
    }
  }

• src/tools/expenses.ts:158-172 (registration)

  Registration of the get_expense tool in the registerExpenseTools function within src/tools/expenses.ts.

  {
    tool: {
      name: 'get_expense',
      description: 'Retrieve a specific expense by ID with complete details including receipts and billing information.',
      inputSchema: {
        type: 'object',
        properties: {
          expense_id: { type: 'number', description: 'The ID of the expense to retrieve' },
        },
        required: ['expense_id'],
        additionalProperties: false,
      },
    },
    handler: new GetExpenseHandler(config),
  },