Launch options must be documented. A draft passed an option its server doesn't have; servers ignore unknown options, so it booted and passed every boot test while its setting did nothing. build now reads the pages research based the variant on, in full, and the drafter rejects any launch option in the startup command that none of them, nor the image's own scripts, mention. Shell tools' options (mkdir -p, [ -n ...]) are skipped; the check is off without sources. The builder is game-agnostic: - AUTHORING.md (the model's rules), the research prompt and the schema describe the rules without naming a game. - The draft prompt no longer includes real templates from the repo. Its format example is one invented server (no real command, options, ports or app id), checked by TestExampleTemplateFollowsTheRules. - Comments, help texts, BUILDER.md and test fixtures use invented names and values. - TestBuilderIsGameAgnostic reads every game's name and id from games/ and fails if any appears in the builder's code, tests, rules, schemas or docs. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>