Understanding AI Agent Skills and Context Management

How do 'skills' work for AI Agents? If I have a 'search knowledge base' node, and then an 'AI Agent' node immediately after, do i need to add 'Lindy Utilities > Add Context' to the agents skills? I thought it maintained context from the previous step(s)? There is also a skill for 'AI > Write' - but AI Agent can already write text? And still does without this skill added? Just unsure exactly what i need to add in the AI Agent skills field, or what their purpose are (other than taking actions with 3rd party integration)