The gradual loss of ability that comes from not practising, when a tool does the work instead. Junior staff who never draft the first version may not develop the judgement that comes from drafting, and experienced staff who stop doing something regularly lose fluency. It is a slow effect and easy to miss until the tool is unavailable or wrong, which is exactly when the skill is needed.
Technical view
Studied in aviation as automation-induced skill degradation and addressed there through mandatory manual practice, and observed in medicine where diagnostic support reduces unaided performance. The concern for knowledge work is specifically the training pipeline: expertise has historically been built by doing the routine work that assistance now absorbs. Mitigations under discussion include deliberate practice without assistance, using tools in a critique role rather than a drafting role for developing staff, and assessing people on judgement about output rather than volume of it.
Related
Part of AI Terminology Index, section: Society and Impact.