{"version":"2.1.239","anchor":"an-alternative-opening-sentence-for-the-system-prompt-off-by","canonical_anchor":"an-alternative-opening-sentence-for-the-system-prompt-off-by","heading":"An alternative opening sentence for the system prompt, off by default","tier":"use","area":"System Prompt","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.239\/e\/an-alternative-opening-sentence-for-the-system-prompt-off-by","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.239","markdown":"### An alternative opening sentence for the system prompt, off by default\n\nAn alternate opening line for Claude's system prompt can be switched on with an environment variable.\n\n**What**\n\nAn experiment replaces the system prompt's opening line, in both the standard and the lean variant, with \"You are an agent working with the user toward their goals, using your own judgment along the way.\" in place of \"You are an interactive agent that helps users with software engineering tasks.\" It is controlled by the `CLAUDE_CODE_INTRO_FRAME` environment variable, and otherwise by a server-side flag named `tengu_ochre_wren` that falls back to off.\n\n**Details**\n\n- The result is cached for the process and logged as `intro_frame_arm_active source=` with either `env` or `growthbook`, so you can tell which decided it.\n- Both the flag and the new sentence are absent from v2.1.238.\n\n**Evidence**\n\n`You are an agent working with the user toward their goals, using your own judgment along the way.`\n\n- Flag `tengu_ochre_wren`: Off in both readings (read for one account on one subscription tier against v2.1.239; this account: off, anonymous baseline: off, compiled default: off)\n- Area: System Prompt\n- Names: `CLAUDE_CODE_INTRO_FRAME`\n- Tier: Use it now\n- Useful: 3\/5\n- Signal: 4\/5\n- Present in the build but not switched on"}