It's not just a toolkit, it's mindset and process.
When describing my job I often say:
"I not only design products and services but I think beyond the 'thing' itself to the entire experience it delivers and also design for those who are effected by it through human-centered decisions."
In order to do that, I analyze complex scenarios through design activities and methodologies that focus on listening to users, employees, and stakeholders in order to create a holistic understanding and solution for all related actors.
I communicate these derived insights through visual models to align all interactions and enable cross-functional teams to deliver the ideal solution and experience.