{"version":"2.1.221","anchor":"leaner-bash-tool-description-behind-the-thrifty-sonic-gate","canonical_anchor":"leaner-bash-tool-description-behind-the-thrifty-sonic-gate","heading":"Leaner Bash tool description behind the thrifty-sonic gate","tier":"soon","area":"Tool Use","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.221\/e\/leaner-bash-tool-description-behind-the-thrifty-sonic-gate","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.221","markdown":"### Leaner Bash tool description behind the thrifty-sonic gate\n\nA much shorter Bash tool description exists, but only when the thrifty-sonic gate is switched on.\n\n**What**\n\nA shortened Bash tool description replaces the long avoidance guidance when the thrifty-sonic gate is on.\n\n**Details**\n\n- the \"IMPORTANT: Avoid using this tool to run ... commands\" block and the dedicated-tool table collapse to a single bullet\n- requires auto mode active plus the gate, which reads `tengu_thrifty_sonic` or `CLAUDE_CODE_THRIFTY_SONIC`\n- the gate falls back to false absent a remote value, so most builds still emit the long text\n\n**Evidence**\n\n`Communication: Output text directly (NOT echo\/printf)`\n\n- Flag `tengu_thrifty_sonic`: Off by default, switched on for this account (read for one account on one subscription tier against v2.1.221; this account: on, anonymous baseline: on, 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- Area: Tool Use\n- Names: `CLAUDE_CODE_THRIFTY_SONIC`\n- Tier: Nothing to try yet\n- Useful: 2\/5\n- Signal: 3\/5\n- Present in the build but not switched on"}