CheckArtifacts checks the number of images, and images' length are under limits.

CheckBuild returns no error if build is valid, otherwise a descriptive canonical error.

CheckBuildAfterSubstitutions returns no error if build is valid, otherwise a descriptive canonical error.

CheckBuildSteps checks the number of steps, and their content.

CheckSubstitutions validates the substitutions map.

CheckSubstitutionsLoose validates the substitutions map, accepting some built-in substitutions overrides.

CheckSubstitutionTemplate checks that all the substitution variables are used and all the variables found in the template are used too.

MaxImageLength is the max length of image value.

MaxTimeout is the maximum allowable timeout for a build or build step.

StartStep is a build step WaitFor dependency that is always satisfied.