Source Intelligence

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

All of v2.1.181 Home All releases olderv2.1.179 v2.1.182newer
Claude Code v2.1.181

Powerup Discovery Banner [Gradual Rollout]

Feature flag
tengu_birch_lantern Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.181: not a boolean we can read

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.

Read once, for one account on one subscription tier, against v2.1.181. It isn't a statement about your account. What a flag value here can and cannot tell you

A new banner for first-time users is gated behind the tengu_birch_lantern feature flag. When shown, it displays:

"New here? Type /powerup for a 5-minute tour — modes, undo, @-mentions, and how to teach Claude your rules."

A "step" arm shows a slightly different message focused on quick lessons. The /powerup command itself remains available to all users.

Evidence

Banner text (search for "New here? Type /powerup for a 5-minute tour") — y8n init at line ~608728; feature flag (search for "tengu_birch_lantern") — qEo() at line ~608722

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.181 →