

"This mod enables Mekanism's chemical processing system to directly handle and refine GregTech ores."
Why this fits:
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Direct: States the core function ("enables... to directly handle and refine").
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Specific: Names both mods ("Mekanism", "GregTech") and the system involved ("chemical processing").
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No Fluff: Omits marketing language, focusing purely on technical integration.
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Clear Scope: Explicitly links GT ores → Mek processing.
If even shorter is needed:
"Adds GregTech ore support to Mekanism's chemical processing."