Thanks for the photos. I don't see any major damage at this point. It is normal for plants to suffer some minor deterioration of older, lower leaves when they are relocated. The closer you can match the temperature, light, and water that it received in the greenhouse, the better it will fare in making an adjustment. Trim off the discolored leaf portions as they occur.
Initially, you may want to keep it in light shade when outdoors and protect it from temps below 50 degrees. Assessing water is difficult with Agaves because it is so hard to get past the sharp leaves to probe the soil with your fingers. Rainfall complicates it. In general, it is a succulent and tolerates drought quite well, but does not like constantly damp soil. The soil should dry deep into the pot before it gest water. Err on the side of dryness with this plant
When moved inside in the fall, it will be forced to make another significant adjustment as the light indoors is greatly reduced, even when supplemented with a grow light. Place it directly in front of and close to your sunniest window. Reduce your watering as it will use very little water in winter.
