{"name":"tengu_basalt_3kr","slug":"tengu-basalt-3kr","family":"flag","title":"Feature flags","noun":"feature flag","description":null,"description_source":"none","described_by":null,"presence":{"first_seen":null,"removed_in":null,"in_current_build":false,"newest_mined":"2.1.308","builds":0,"mined_builds":149,"first_cited":null},"aliases":[],"entries":[{"version":"2.1.70","anchor":"mcp-instructions-now-delivered-as-deltas","heading":"MCP Instructions Now Delivered as Deltas","line":null,"released_at":"2026-03-06 00:09:06","reason":"gate cited by this entry, found in this entry's text"}],"entries_total":1,"docs":[],"docs_total":0,"gates":[],"related":[{"name":"tengu_basalt_loom","slug":"tengu-basalt-loom","description":"Plan artifacts now have their own switch instead of riding along with an unrelated experiment."},{"name":"tengu_basalt_meadow","slug":"tengu-basalt-meadow","description":"Default `false`. When on, each prompt submission sends a `tengu_render_glyph_cardinality` telemetry event with the terminal renderer's style-pool size and glyph-atlas key count, plus the terminal program and a session-age bucket, and glyph-atlas recording stays on even when `tengu_xterm_atlas_reset` is off."},{"name":"tengu_basalt_scarp","slug":"tengu-basalt-scarp","description":"Default `false`. Takes effect only while `tengu_basalt_spur` is on, under the same provider conditions. When a forked request skips cache writes and its fork point is the same message as its main prompt-cache breakpoint, the breakpoint pinned at the fork point is placed one cacheable message earlier."},{"name":"tengu_basalt_spur","slug":"tengu-basalt-spur","description":"Default `false`. Applies only when the provider is the first-party API, Anthropic on AWS or Google Cloud, or Foundry, and experimental betas are allowed (`CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS` unset, no HIPAA restriction). When on, the background memory-extraction (`extract_memories`) and auto-dream forks skip writing their new messages to the prompt cache, and request building can pin an extra cache breakpoint at the message a forked request branched from."}],"url":"https:\/\/changelogs.core-directive.com\/reference\/flag\/tengu-basalt-3kr","family_url":"https:\/\/changelogs.core-directive.com\/reference\/flag.json"}