The title mol­ecule, C9H7ClN4OS, is almost planar, with an r.m.s. deviation of 0.034 (2) Å for the mean plane through all the non-H atoms. Intra­molecular N—H⋯O and N—H⋯N hydrogen bonds form S(6) and S(5) ring motifs, respectively. In the crystal, mol­ecules are assembled into inversion dimers through pairs of co-operative N—H⋯Cl inter­actions. These dimers are connected along the b axis by N—H⋯O and N—H⋯S hydrogen bonds, generating layers parallel to (103). The layers are further connected along the a axis into a three-dimensional network, through weak π–π stacking inter­actions [centroid–centroid distance = 3.849 (2) Å].

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