A detail explanation on what actually the JR Tokyo Wide Pass covered. Example, which is the last station that the Pass covered, before I need to pay? Which are the non-JR lines that the pass covered? Who is the pass actually for? Is it worth it? And where you can purchase the pass?

Agent JR Pass - https://click.jrpass.com/SH8T

Agent Regional Pass - https://click.jrpass.com/SH8U