Prepare boiling water canner. Heat jars in simmering water until ready to use, but do not boil. Wash lids in warm soapy water and set aside with bands.
Place crushed berries and lemon juice in a saucepan. Sprinkle pectin evenly over berries and bring mixture to a full rolling boil that cannot be stirred down, over high heat, stirring constantly.
Whisk in agave syrup. Return mixture to a full rolling boil. Boil hard 1 minute, stirring constantly. Remove from heat. Skim foam if necessary.
Ladle hot jam into a hot jar, leaving a ¼-inch headspace. Remove air bubbles. Wipe jar rim. Center lid on jar and apply band, adjusting to fingertip tight. Place jar in boiling water canner. Repeat until all jars are filled.
Process jars 10 minutes, adjusting for altitude. Turn off heat, remove lid, and let jars stand 5 minutes. Remove jars and cool 12-24 hours. Check lids for seal—they should not flex when center is pressed.