The competence provision is two sentences and both matter. "A practitioner must possess the necessary competence to engage in practice before the Internal Revenue Service. Competent practice requires the appropriate level of knowledge, skill, thoroughness, and preparation necessary for the matter for which the practitioner is engaged." Preparation is the word that reaches tooling. Knowing what a tool does with a document, where it fails, and what it will produce when it has too little to go on is preparation for the matter, not a separate technical accomplishment somebody else holds. The section then adds that competence "may be acquired through various methods, such as consulting with experts in the relevant area or studying the relevant law", which locates the remedy where the practitioner can actually reach it.
Section 10.36 moves up a level. An individual — or individuals — with principal authority and responsibility for overseeing a firm's practice before the Service must take reasonable steps to ensure the firm has adequate procedures to comply with the regulations. That is the provision under which a written policy on which tools may touch a client matter stops being good practice and starts being answerable, and it is also the provision under which a partner is exposed to a pattern of non-compliance by people they supervise rather than to a single lapse. The ethics code imposes a parallel duty on professional accountants generally, reaching those working under the accountant's authority: see competence to use an AI tool.
The standard for discipline under §10.36 is deliberately high and should be read as such: the individual is subject to it where they, through wilfulness, recklessness or gross incompetence, do not take reasonable steps. A practice is not sanctioned here for an isolated error, or for a policy that turned out to be imperfect. What it is exposed to is having no procedures at all in an area where the risk is evident, or having them and ignoring what they said. That is a narrower target than most firm policy documents are written against, and it argues for a short procedure that is genuinely followed over a long one that is not. Where the same tool is used on returns as well as on advice, the diligence standards those attract sit at §10.22 and at §10.37.