Pragmatics, simply put, is the social aspect of language. This engages more cognitive processes, such as recognizing patterns of interaction between speakers, turn taking, providing relevant information, and staying on topic. So what is the impact of a child's pragmatic competency on literacy?
According to Elleseff, pragmatic language skills have a direct impact on writing mechanics, grammatical and syntactic complexity, the ability to analyze their own writing (edit, revise) and cohesion/coherence (2021). Therefore proper assessment and intervention is crucial as the student's literacy and writing abilities are intricately interwoven and will be impacted by deficits in this domain.
https://laviinstitute.com/wp-content/uploads/2021/12/The-Role-of-Pragmatic-Language-in-Reading-Comprehension-and-Written-Expression-Focus-on-Assessment.pdf