1. A method for providing completion support and on demand validation in a web tool that operates on live resources, the method comprising: creating, by one or more computer processors, one or more lists of content, wherein the one or more lists of content include one or more references to one or more runtime objects, and wherein content in the one or more lists of content includes one or more elements of a uniform resource identifier; parsing, by the one or more computer processors, the one or more lists of content, wherein parsing the one or more lists of content includes determining a name of at least one of the one or more runtime objects; populating, by the one or more computer processors, one or more lists of one or more choices with the parsed one or more lists of content; creating, by the one or more computer processors, one or more callbacks for one or more runtime objects referenced by the one or more lists of one or more choices; displaying, by the one or more computer processors, the one or more lists of one or more choices; building, by the one or more computer processors, a dependency tree that includes at least one of the one or more runtime objects referenced by the one or more lists of content; receiving, by the one or more computer processors, a notification of a change to one or more of the referenced one or more runtime objects, wherein receiving a notification of a change to one or more of the referenced one or more runtime objects results from creation of the one or more callbacks; running, by the one or more computer processors, a validation against the one or more changed referenced one or more runtime objects; determining, by the one or more computer processors, whether one or more of the one or more changed referenced one or more runtime objects is invalid; responsive to determining one or more of the one or more changed referenced one or more runtime objects is invalid, marking, by the one or more computer processors, the invalid changed referenced one or more runtime objects; outputting, by the one or more computer processors, results of the validation; and applying, by the one or more computer processors, one or more types of one or more filters to the one or more lists of content, wherein one or more types of one or more filters includes at least one of a type filter and a predicate filter.