{"name":"tengu_cobalt_plinth_aspen","slug":"tengu-cobalt-plinth-aspen","family":"flag","title":"Feature flags","noun":"feature flag","description":"The preview browser is locked to the local server and refuses to run if the lock fails.","description_source":"entry","described_by":{"version":"2.1.247","anchor":"preview-locks-the-browser-to-the-local-server-and-self-tests"},"presence":{"first_seen":"2.1.247","removed_in":null,"in_current_build":true,"newest_mined":"2.1.308","builds":52,"mined_builds":149,"first_cited":{"version":"2.1.247","released_at":"2026-08-26 18:02:01","spans":1}},"aliases":[],"entries":[{"version":"2.1.292","anchor":"artifact-preview-emulator-engine-is-built-but-cannot-be-se","heading":"Emulator engine for artifact previews is built but cannot be selected yet","line":"An emulator engine for artifact previews in remote sessions is built, but an internal switch that starts off keeps local Chrome in use","released_at":"2026-10-06 17:10:31","reason":"gate cited by this entry"},{"version":"2.1.283","anchor":"artifact-preview-now-switches-itself-off-when-no-chromechro","heading":"Artifact preview turns itself off when no Chrome-type browser is found","line":"Artifact preview now stays off when no Chrome, Chromium or Edge is found, unless `CLAUDE_CODE_ARTIFACT_PREVIEW=true` is set","released_at":"2026-09-25 18:46:11","reason":"gate cited by this entry"},{"version":"2.1.283","anchor":"artifact-preview-action-now-also-needs-a-local-browser","heading":"Artifact preview is only offered when a local browser is found","line":"The artifact preview action now needs a Chrome or Playwright browser found at startup, unless CLAUDE_CODE_ARTIFACT_PREVIEW is set to true","released_at":"2026-09-25 18:46:11","reason":"gate cited by this entry"},{"version":"2.1.280","anchor":"artifact-verifypreview-tools-merged-into-a-single-check-t","heading":"Artifact verify\/preview tools merged into a single 'check' tool","line":"Artifact verify and preview tools are merged into one 'check' tool with old verb names still accepted","released_at":"2026-09-22 15:44:39","reason":"gate cited by this entry"},{"version":"2.1.257","anchor":"new-check-artifact-addon-tool-local-preview-runtime-dia","heading":"New \"check\" artifact addon tool: local preview + runtime diagnostics, dark-launched behind two flags","line":"A new check artifact addon previews a page locally and reads viewers' runtime diagnostics, behind two env vars.","released_at":"2026-09-01 17:15:33","reason":"found in this entry's text, gate cited by this entry"},{"version":"2.1.247","anchor":"preview-locks-the-browser-to-the-local-server-and-self-tests","heading":"Preview locks the browser to the local server and self-tests the lock before loading","line":"The preview browser is locked to the local server and refuses to run if the lock fails.","released_at":"2026-08-26 18:02:01","reason":"gate cited by this entry, found in this entry's text"},{"version":"2.1.247","anchor":"artifact-preview-a-local-headless-chrome-render-check-that-i","heading":"Artifact preview : a local headless-Chrome render check that is not compiled into this build","line":"An artifact preview action would screenshot a page locally at several widths, but it cannot run here.","released_at":"2026-08-26 18:02:01","reason":"gate cited by this entry, found in this entry's text"}],"entries_total":7,"docs":[],"docs_total":0,"gates":[{"version":"2.1.292","state":"unknown","account":null,"baseline":null,"code_default":false},{"version":"2.1.283","state":"unknown","account":null,"baseline":null,"code_default":false},{"version":"2.1.280","state":"unknown","account":null,"baseline":null,"code_default":false},{"version":"2.1.257","state":"unknown","account":null,"baseline":null,"code_default":false},{"version":"2.1.247","state":"unknown","account":null,"baseline":null,"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_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."},{"name":"tengu_cobalt_plinth_direct","slug":"tengu-cobalt-plinth-direct","description":"Artifact availability now hinges on one gate, and direct upload kicks in for create paths."}],"url":"https:\/\/changelogs.core-directive.com\/reference\/flag\/tengu-cobalt-plinth-aspen","family_url":"https:\/\/changelogs.core-directive.com\/reference\/flag.json"}