This study focuses on disciplinary literacy in primary craft education. Disciplinary literacy refers to the specialised ways of reading, writing, and speaking in a particular discipline. In Finland, crafts is an obligatory school subject, and pupils are supposed to conceive and manage a complete crafts process, including documentation. However, disciplinary literacy in crafts has rarely been studied, let alone at the primary level. In this study, we explored the quality of a sample of work descriptions produced by third-graders. The data included digitally produced work descriptions (N=79) written by 42 third-grade pupils in a Finnish primary school. Based on a qualitative analysis, six main dimensions of work descriptions as a textual genre emerged: word count, crafts vocabulary, structure, spelling, multimodality, and self-assessment. The quality of work descriptions was analysed quantitatively according to scoring criteria based on these dimensions. A cluster analysis indicated that there were three groups of work descriptions with respect to their level of disciplinarity: limited, emerging, and advanced descriptions. The results show that the structure of the disciplinary texts develops first, and subject-specific vocabulary stabilises after that. The paper discusses the foundation for disciplinary literacy in primary craft education.