Provides code completion for JS Doc tags, only within JS Doc comment blocks so it doesn't get in the way of your coding. Type @ inside a JSDoc (/** */) style tag and code completion suggestions will begin (assuming you have it enabled). Doesn't provide completion for inline tags (correctly).
The InteliSense detail element indicates the format of any follow-on requirements:
< > indicated a field. If the content is a single word, then the field is also a single word.
[ ] indicates an optional section.
Any type information fields have the { } inserted automatically.
Descriptions and completion suggestions from documentation at @Use JSDoc.