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In page Self-executing right:

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To decide whether or not a rule is self-executing, one must only look at the rule in question, and national traditions do not count. A rule that says that states should guarantee freedom of expression to its citizens is self-executing.[citation needed] A rule that states should take all the necessary measures to create enough employment is not.[citation needed] Non-self-executing rules of international law impose the obligation on states only to take measures and to create or alter legislation. Citizens or national judges cannot invoke those rules (and demand employment, as in the previous example) in a national court. That means that international law that is not self-executing must be transformed into national law to take effect.