{"name":"tengu_cobalt_plinth_putguard","slug":"tengu-cobalt-plinth-putguard","family":"flag","title":"Feature flags","noun":"feature flag","description":"Default `true`. When on, an artifact publish upload `PUT` (the page or its thumbnail image) that returns a 2xx status without an `x-goog-generation` response header is treated as failed: it is reported as status `403` with the error `upload intercepted: 2xx without x-goog-generation`, on the assumption that a proxy answered instead of Google Cloud Storage. When off, any 2xx response counts as a successful upload.","description_source":"code","described_by":{"bundle":"2.1.238","author":"claude-opus-5-5"},"presence":{"first_seen":"2.1.193","removed_in":"2.1.239","in_current_build":false,"newest_mined":"2.1.309","builds":44,"mined_builds":150,"first_cited":null},"aliases":[],"entries":[{"version":"2.1.193","anchor":"tengu-cobalt-plinth-putguard-in-development","heading":"tengu_cobalt_plinth_putguard [In Development]","line":null,"released_at":"2026-06-25 19:05:08","reason":"gate cited by this entry, found in this entry's text"}],"entries_total":1,"docs":[],"docs_total":0,"gates":[{"version":"2.1.239","state":"on-in-code","account":true,"baseline":true,"code_default":null},{"version":"2.1.193","state":"on-in-practice","account":true,"baseline":true,"code_default":false}],"related":[{"name":"tengu_cobalt_plinth","slug":"tengu-cobalt-plinth","description":"PR review artifact pages can show a pinned button that approves the pull request from your GitHub account."},{"name":"tengu_cobalt_plinth_alder","slug":"tengu-cobalt-plinth-alder","description":"Claude can now read back a published artifact's contents; browsing, multi-file publishing and deletion are built but off."},{"name":"tengu_cobalt_plinth_aspen","slug":"tengu-cobalt-plinth-aspen","description":"The preview browser is locked to the local server and refuses to run if the lock fails."},{"name":"tengu_cobalt_plinth_bracken","slug":"tengu-cobalt-plinth-bracken","description":"You could start a private artifact from a published template, but two server switches keep it shut here."},{"name":"tengu_cobalt_plinth_bryony","slug":"tengu-cobalt-plinth-bryony","description":"Claude Code now always tells the artifact system it supports five-class permission asks, instead of depending on a setting or remote switch"},{"name":"tengu_cobalt_plinth_burnet","slug":"tengu-cobalt-plinth-burnet","description":"Artifact comment and subscription operations can each be switched on separately from the server."},{"name":"tengu_cobalt_plinth_campion","slug":"tengu-cobalt-plinth-campion","description":"Publish checks could warn about page thumbnails, but the experiment is off."},{"name":"tengu_cobalt_plinth_comfrey","slug":"tengu-cobalt-plinth-comfrey","description":"A new flag affects relay routing when reading published artifact files."},{"name":"tengu_cobalt_plinth_damson","slug":"tengu-cobalt-plinth-damson","description":"The artifact tool's flat verbs are mapped to a canonical action shape, with a gate deciding which toolset is active."},{"name":"tengu_cobalt_plinth_dataviz","slug":"tengu-cobalt-plinth-dataviz","description":"The chart skill hint now only appears if the dataviz skill is actually installed."}],"url":"https:\/\/changelogs.core-directive.com\/reference\/flag\/tengu-cobalt-plinth-putguard","family_url":"https:\/\/changelogs.core-directive.com\/reference\/flag.json"}