{"name":"tengu_mellow_hollerith","slug":"tengu-mellow-hollerith","family":"flag","title":"Feature flags","noun":"feature flag","description":"New built-in 'Claude Test' plugin runs plain-language specs against your local dev server in a real browser and reports PASS\/FAIL","description_source":"entry","described_by":{"version":"2.1.274","anchor":"new-built-in-claude-test-plugin-for-browser-based-spec-tes"},"presence":{"first_seen":"2.1.274","removed_in":"2.1.296","in_current_build":false,"newest_mined":"2.1.319","builds":12,"mined_builds":159,"first_cited":{"version":"2.1.300","released_at":"2026-10-14 14:27:26","spans":1}},"aliases":[],"entries":[{"version":"2.1.300","anchor":"six-new-statsig-style-gates-registered-tengu-mellow-holleri","heading":"Six server-controlled switches are now checked early at startup","line":"Six features controlled from Anthropic's servers are now checked early at startup, and five are off unless switched on remotely","released_at":"2026-10-14 14:27:26","reason":"gate cited by this entry, found in this entry's text"},{"version":"2.1.274","anchor":"new-built-in-claude-test-plugin-for-browser-based-spec-tes","heading":"New built-in \"Claude Test\" plugin for browser-based spec testing","line":"New built-in 'Claude Test' plugin runs plain-language specs against your local dev server in a real browser and reports PASS\/FAIL","released_at":"2026-09-16 22:36:09","reason":"gate cited by this entry"}],"entries_total":2,"docs":[],"docs_total":0,"gates":[{"version":"2.1.300","state":"unknown","account":null,"baseline":false,"code_default":null}],"related":[{"name":"tengu_mellow_anchor","slug":"tengu-mellow-anchor","description":"Claude Code adds a remote feature switch that is off unless turned on, and a sign-in item in its diagnostic list"},{"name":"tengu_mellow_beacon","slug":"tengu-mellow-beacon","description":"A server-controlled setting can make some background requests to the model point back to the reply they came from"},{"name":"tengu_mellow_ember","slug":"tengu-mellow-ember","description":"The check that skips saving memories when a conversation already wrote to memory gains a new option, off unless switched on remotely"},{"name":"tengu_mellow_heron","slug":"tengu-mellow-heron","description":"Claude Code can now track prompts that were merged or queued together, for rewinding and spotting unanswered turns, when a switch is on"},{"name":"tengu_mellow_minsky","slug":"tengu-mellow-minsky","description":"A new switch that falls back to on gates an unnamed feature, next to a foreground-launch check that answers yes when it errors"},{"name":"tengu_mellow_sunset","slug":"tengu-mellow-sunset","description":"When `\/goal` arrives as a verified human message from Slack, Claude Code replies with a fixed message and sets no goal"}],"url":"https:\/\/changelogs.core-directive.com\/reference\/flag\/tengu-mellow-hollerith","family_url":"https:\/\/changelogs.core-directive.com\/reference\/flag.json"}