"although I agree" is a correct and usable phrase in written English.
You can use this phrase when someone has stated an opinion and you would like to express that you share that opinion. For example: "I think that a 3-day weekend is essential to help us unwind." "Although I agree, I think that may be difficult to implement due to time constraints."
Although I agree, I do not think it should just go on and on forever.
Although I agree that Californians are environmentally conscientious, statistics that overstate the case are unnecessary.
Although I agree with his conception, I wish to offer you something slightly different.
Although I agree that the Patent and Trademark Office displays questionable consistency and competence, that is not the major problem.
Although I agree that bad eating habits are a major factor in obesity, television is not the major culprit.
Violet Although I agree that the system is unfair, Radcliffe did not get the information he needed to have to make an informed choice.
Although I agree with them, I feel that some form of surveillance should exist- one that tracks specific websites and people instead of monitoring innocents.
Kate Murray, Edinburgh Retirement under threat Although I agree that later life is a time for new adventures, I believe it is in retirement that these adventures begin.
Although I agree with Ms. Dohrenwend that the government perhaps should get out of the "marriage" business altogether and simply recognize civil unions, that shift is not likely to happen anytime soon.
To the Editor: Although I agree with David Brooks that many young adults' social entrepreneurship projects provide only temporary relief and do not address the core issues of a community, he doesn't give these projects the credit they deserve.
"Although I agree that the court of appeals applied the wrong standard," Justice Alito wrote in a concurrence joined by no other justice, "I think that the majority does not do enough to explain the right standard".
