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:evalThe :eval header argument can be used to limit the evaluation of
specific code blocks. The :eval header argument can be useful for
protecting against the evaluation of dangerous code blocks or to ensure that
evaluation will require a query regardless of the value of the
org-confirm-babel-evaluate variable. The possible values of
:eval and their effects are shown below.
never or noThe code block will not be evaluated under any circumstances.
queryEvaluation of the code block will require a query.
never-export or no-exportThe code block will not be evaluated during export but may still be called interactively.
query-exportEvaluation of the code block during export will require a query.
If this header argument is not set then evaluation is determined by the value
of the org-confirm-babel-evaluate variable see Code evaluation security.