To instruct is to sufficiently describe a potential action.
Instruct complements the other basic indicative actions of state and ask.
Instructions are often given to by agents to other agents. However, agents may develop instructions for themselves to use in specific contexts. Agents may also instruct programmable tools, including computers.
Useful instructions require shared context. That context may often be implied in specific instructions. However, instructions do often include specific details about their intended context.