['This paper reports the experimental observation of a **non-reciprocal skyrmion Hall effect (NSkHE)** in **hybrid chiral skyrmion tubes** confined within **synthetic antiferromagnetic (SyAFM) multilayers** at room temperature.\n\n### Advantages and Key Findings:\n\n1.  **Observation of Intrinsic NSkHE in 3D Skyrmion Tubes:** The study directly demonstrates a current-induced NSkHE in 3D hybrid chiral skyrmion tubes, a feature generally absent in simpler 2D skyrmions or only observed due to extrinsic effects (like pinning or confinement asymmetry).\n2.  **Dependence on Magnetic Compensation:** The NSkHE is strongly dependent on the degree of magnetic compensation ($m_c$) in the SyAFM system. It is clearly observed in the low-compensation stack (ST1, $m_c \\approx 50\\%$) in the flow regime ($v_{\\text{ave}} \\approx 25 \\text{ m s}^{-1}$), but becomes negligible in the high-compensation stack (ST2, $m_c \\approx 80\\%$).\n3.  **Mechanism Identified as Helicity Dynamics:** Through micromagnetic modeling, the authors attribute the NSkHE to the **dynamic oscillation of the skyrmion helicity** during motion, specifically a transition towards a more Bloch-like character in the inner layers at higher current densities (Region 2). This dynamic modulation of the internal degrees of freedom directly leads to an asymmetric Spin-Orbit Torque (SOT) efficiency tensor ($\\hat{I}_{\\mu\\gamma}$).\n4.  **Intrinsic Nature:** The NSkHE is found to emerge only in the high-velocity "flow regime" ($v_{\\text{ave}} > 30 \\text{ m s}^{-1}$), vanishing in the creep/depinning regime, which strongly suggests an **intrinsic mechanism** inherent to the complex 3D structure, rather than extrinsic pinning effects (which should cause asymmetry across all velocities).\n5.  **Tunability:** The non-reciprocity can be tuned by controlling the magnetic compensation, which modulates the long-range dipolar interactions—a critical factor stabilizing the hybrid structure.\n\n### Shortcomings and Limitations:\n\n1.  **Quantitative Discrepancies in Modeling:** The authors note that the micromagnetic simulations (performed at zero temperature) show only **qualitative** agreement with the experimental observations. Limitations include:\n    *   The phenomenological damping ($\\alpha$) obtained from experiments contains contributions (like inhomogeneous broadening and interfacial spin mixing) not fully accounted for in the simulation.\n    *   The experimental inability to distinguish the contribution of the Oersted field from the intrinsic symmetry of the damping-like torque (DLT).\n2.  **Velocity Dependence:** The NSkHE is only observed in the "flow regime" at high velocities ($v_{\\text{ave}} > 25 \\text{ m s}^{-1}$). The absence of a significant velocity difference between positive and negative currents (Fig. 2c) is mentioned as a key differentiator from 2D skyrmion phenomena driven by extrinsic effects, but the strong NSkHE is *only* present above a critical velocity threshold.\n\n### Equations/Key Tensor Definitions Mentioned:\n\nThe paper investigates the SOT efficiency tensor ($\\hat{I}_{\\mu\\gamma}$) and the dissipation tensor ($\\hat{D}_{\\mu\\gamma}$):\n\n1.  **Dissipation Tensor Component ($D_{\\mu\\nu}$):**\n    $$D_{\\mu\\nu} = \\int_S d^2r \\left(\\frac{\\partial \\mathbf{m}_i}{\\partial x_\\mu} \\cdot \\frac{\\partial \\mathbf{m}_i}{\\partial x_\\nu}\\right)$$\n    (Used to check for shape distortions, found to show no significant deviation in Region 1, and only imperceptible deviations in Region 2.)\n\n2.  **SOT Efficiency Tensor Component ($I_{\\mu\\gamma}$):**\n    $$I_{\\mu\\gamma} = \\int_S d^2r \\left[\\left(\\partial_t \\mathbf{m}_i \\times \\mathbf{m}_i\\right) \\cdot \\hat{e}_\\mu\\right]$$\n    (The difference $\\hat{I}_{\\mu\\gamma}[+J] - \\hat{I}_{\\mu\\gamma}[-J]$ was found to be the main contributor to the NSkHE in Region 2, being orders of magnitude larger than the dissipation tensor difference.)\n\nIn summary, the work provides crucial experimental and theoretical insights into the complex dynamics of 3D magnetic textures, establishing that the **dynamic modulation of helicity** within hybrid skyrmion tubes is a source of **intrinsic, tunable non-reciprocity** in the skyrmion Hall effect.']