What do you mean by AI Agent?

I think the term is overused with too many meanings.

The first time I noticed the term was reading the langchain docs. In it they had a prompt template as a core prompts you plug info into, a prompt chain which are sequentially executed prompts and an agent was defined to have tools the LLM could ask to trigger at it's discretion.

Since then I've noticed AI agent being mentioned as an LLM chatting support agent on websites, LLM sessions containing an identity inside the prompts to be reused like this is your marketing agent, sales agent and developer agent.

The most recent and seemingly frequent use of the term across social media seems to be automation pipelines, what used to be called a bit as taking a trigger like a slack message and reacting, if you include LLM is now an AI agent.

Does it make sense to use one term that means so many different things?