Loomcheck
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Loomcheck is now part of Dogtag, the package that establishes an integral family's identity before anything is computed with it. Its screen lives there as the module loomcheck.py: given a conformal position-space integral as a dictionary of propagator powers, or an entry of the public four-loop basis file of arXiv:2607.11645, it tests the three graph conditions (conformal weight at every internal vertex, planarity of the full graph with numerator edges included, and the face condition) under which the integral can fall under the published Yangian-symmetry theorems for fishnet and loom graphs, and returns true or false for each with an overall verdict. A failed condition proves the graph lies outside those theorems as published; a pass says only that they do not exclude it. See the Dogtag page for the description, the routines screen_graph, load_entries and parse, the self-test and the requirements.