Antiferromagnet-superconductor (AFM-SC) hybrids offer a rich but largely unexplored platform for realizing spin-triplet Cooper pairing and chiral topological superconductivity, yet experimental demonstrations remain scarce. Here, we report the modification of superconductivity in ${\mathrm{NbSe}}_2/{\text{MnPS}}_3$ heterostructures via the AFM proximity effect. The Néel order of ${\mathrm{MnPS}}_3$ effectively suppresses the Ising superconductivity of ${\mathrm{NbSe}}_2$ and induces a spatially inhomogeneous superconducting state with an inherent junction network. Leveraging this intrinsic Josephson coupling, we observe a finite phase offset in the critical-current interference pattern and a zero-field supercurrent diode effect—two independent signatures of spontaneous time-reversal symmetry breaking. Supported by theoretical modeling, we attribute these emergent phenomena to the proximity-induced stabilization of a subdominant in-plane triplet pairing channel, which is distinct from the intrinsic Ising channel of ${\mathrm{NbSe}}_2$. Our findings establish AFM-SC heterostructures as a versatile platform for exploring nonreciprocal transport and open promising avenues for superconducting spintronics.

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• Josephson effect
• Proximity effect
• Spin-triplet pairing
• 2-dimensional systems
• Interfaces
• Unconventional superconductors