The toolbox stands for the skills and resources a person can reach for. Dream books read an organised one as readiness and a missing tool as the sense of lacking the right means for a job.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.