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We derive generalizations of McShane's identity for higher ranked surfacegroup representations by studying a family of mapping class group invariantfunctions introduced by Goncharov and Shen which generalize the notion ofhorocycle lengths. In particular, we obtain McShane-type identities forfinite-area cusped convex real projective surfaces by generalizing theBirman--Series geodesic scarcity theorem. More generally, we establishMcShane-type identities for positive surface group representations withloxodromic boundary monodromy, as well as McShane-type inequalities for generalrank positive representations with unipotent boundary monodromy. Our identitiesare systematically expressed in terms of projective invariants, and we studythese invariants: we establish boundedness and Fuchsian rigidity results fortriple and cross ratios. We apply our identities to derive the simple spectraldiscreteness of unipotent-bordered positive representations, collar lemmas, andgeneralizations of the Thurston metric.

McShane identities for Higher Teichm\"uller theory and the Goncharov-Shen potential