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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 v2.1.251 Home All releases ←olderv2.1.250
Claude Code v2.1.251

First-party behavior gated by CLAUDE_CODE_DAPPER_LAGOON

Not switched on
Useful2 Signal3
Internals Notable not in their notes

An environment variable overrides whether something counts as first-party.

Feature flag
tengu_dapper_lagoon Off in both readings

The flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.

This account: off · anonymous baseline: off · compiled default in v2.1.251: not a boolean we can read

Read once, for one account on one subscription tier, against v2.1.251. It isn't a statement about your account. What a flag value here can and cannot tell you

CLAUDE_CODE_DAPPER_LAGOON
What

A capability that decides whether something is treated as first-party is controlled by the CLAUDE_CODE_DAPPER_LAGOON environment variable. Without it, two remote flags, tengu_foamy_spring and tengu_dapper_lagoon, decide, and both default to on when the server sends nothing.

Evidence

CLAUDE_CODE_DAPPER_LAGOON

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

See this entry in the whole of v2.1.251 →