In a Dutch oven over medium, toast the chilies, pressing with a wide spatula and flipping once or twice, until fragrant and a shade darker in color, 2 to 4 minutes.
Transfer to a small bowl and add the boiling water. Let stand until softened, about 10 minutes.
While the chilies soak, in the same pot, heat 1 tablespoon of oil over medium-high until shimmering.
Add the tomatoes, onion and garlic, then cook, turning occasionally with tongs, until charred all over, 8 to 10 minutes.
Transfer the tomatoes, onion and garlic to a blender and add the agave and 1 teaspoon salt. Drain the chilies, discarding the water, and add to the blender. Blend until smooth, about 2 minutes, scraping the sides as needed.
In the same the pot, heat the remaining 2 tablespoons oil over medium until shimmering. Add the puree and cook, stirring constantly, until slightly darkened in color and thickened, 5 to 7 minutes.
Stir in the broth, salt, black pepper, MSG, garlic salt, pinto beans, white hominy, garbanzo beans, and corn, and bring to a simmer.
Add some crumbled tortilla chips to the bottom of serving bowls, then add soup, and top with more crumbled tortilla chips, sour cream and chopped chives.