{"version":"2.1.301","anchor":"system-prompt-gains-a-variant-mode-with-surface-section-and","canonical_anchor":"system-prompt-gains-a-variant-mode-with-surface-section-and","heading":"System prompt gains an alternate layout that is not yet in use","tier":"soon","area":"System Prompt","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.301\/e\/system-prompt-gains-a-variant-mode-with-surface-section-and","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.301","markdown":"### System prompt gains an alternate layout that is not yet in use\n\nClaude Code's system prompt can now be built in an alternate layout with extra sections, but the prompt sent in ordinary use is unchanged\n\n**Unclear.** It is not clear what turns the alternate system prompt layout on.\n\n**What**\n\nThe system prompt is the set of instructions Claude Code sends to the model at the start of every conversation. The part of Claude Code that assembles it can now build an alternate layout. In that layout:\n\n- a section describing where Claude Code is running is added\n\n- a section about system messages is added\n\n- some sections use different wording\n\n- the paragraph naming the model has a different form\n\nIn the setups checked, the prompt Claude Code sends is unchanged, so this layout does not appear to be in use yet.\n\n**Why**\n\nThis looks like preparation for a different version of the instructions for some particular way of running Claude Code.\n\n- Flag `tengu_silent_harbor`: Off in both readings (read for one account on one subscription tier against v2.1.301; this account: off, anonymous baseline: off, compiled default: off) These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.\n- Flag `tengu_slate_bittern`: Not enough to say (read for one account on one subscription tier against v2.1.301; this account: no value returned, anonymous baseline: no value returned, compiled default: on) These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.\n- Area: System Prompt\n- Tier: Nothing to try yet\n- Useful: 2\/5\n- Signal: 4\/5\n- Scope: individual\n- Heads-up: no\n- Present in the build but not switched on"}