{"version":"2.1.310","anchor":"new-flag-tengu-rustling-lantern-picks-between-two-tool-promp","canonical_anchor":"new-flag-tengu-rustling-lantern-picks-between-two-tool-promp","heading":"Some tool instructions gain an alternate wording that is off by default","tier":"soon","area":"System Prompt","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.310\/e\/new-flag-tengu-rustling-lantern-picks-between-two-tool-promp","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.310","markdown":"### Some tool instructions gain an alternate wording that is off by default\n\nA remote switch can now swap in alternate instruction text for some tools, and the existing text is used unless it is switched on remotely\n\n**Unclear.** Which tools are affected and what the alternate text says is not shown.\n\n**What**\n\nEach tool Claude Code can use comes with written instructions telling the model how to use it. A new remote switch now picks between two versions of that text in at least three places, one of them in a tool's own instructions.\n\nThe switch is off unless it is switched on remotely. With no setting from Anthropic's servers, the existing text is used.\n\n**Why**\n\nThis lets Anthropic try alternate tool instructions for some accounts, so the model may be told to use those tools differently where it is switched on.\n\n- Flag `tengu_rustling_lantern`: Not enough to say (read for one account on one subscription tier against v2.1.310; this account: no value returned, anonymous baseline: no value returned, 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: System Prompt\n- Tier: Nothing to try yet\n- Useful: 1\/5\n- Signal: 3\/5\n- Scope: individual\n- Heads-up: no\n- Present in the build but not switched on"}