The economic substance points to labour hire. The classification belongs before signing.
Classify each assignment by reference to the actual workflow. Record the result owed by the external contractor, who supplies materials and tools, who organises the daily work and who bears responsibility for success. The label works contract does not decide the classification.
Then record the provider, hirer, affected personnel and assignment periods. The post on false self-employment and freelancers addresses a different review subject. Labour hire records and transaction consequences require their own analysis.