Source Intelligence
Follow Discord

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 v2.1.223 Home All releases ←olderv2.1.222 v2.1.224newer→
Claude Code v2.1.223

"Investigate first" system prompt experiment removed

You'll notice
Useful3 Signal0
System Prompt not in their notes

Claude no longer spends up to a minute investigating before asking you a clarifying question.

Feature flag
tengu_slate_harrier 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 v2.1.223: 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 v2.1.223. It isn't a statement about your account. What a flag value here can and cannot tell you

CLAUDE_CODE_INVESTIGATE_FIRST
What

The experiment that told Claude to spend up to a minute on read-only investigation before asking a clarifying question has been taken out entirely.

Details
  • Gone: the CLAUDE_CODE_INVESTIGATE_FIRST environment variable, the tengu_slate_harrier gate, and its prompt-cache entry.
  • The shortened "compact" variant of the "Executing actions with care" block was removed too.
  • Only the full-length version of that block remains.
Evidence

# Executing actions with care

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.223 →