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 v2.1.242 Home All releases olderv2.1.241 v2.1.243newer
Claude Code v2.1.242

Subagent results can carry a provenance frame that skips the hand-off review

Under the hood
Useful2 Signal3
Subagents

Subagent results can be tagged to show which parts Claude Code wrote versus the model.

Feature flag
tengu_melodic_wolf 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 v2.1.242: on

tengu_auto_mode_config 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 v2.1.242: not a boolean we can read

Read once, for one account on one subscription tier, against v2.1.242. It isn't a statement about your account. What a flag value here can and cannot tell you

What

Results handed back from a subagent can be wrapped in bookkeeping that marks which blocks Claude Code itself wrote versus what the model produced, so a hook rewriting the text can be told apart. When that framing covers the whole delivery, the classifier review of the hand-off is skipped.

Details
  • Framing is keyed off tengu_melodic_wolf, which falls back to off in this build.
  • Skipping the review requires classifyHandoff in tengu_auto_mode_config to be false, and is logged as skipped_framed_handback or skipped_enveloped_handback under tengu_auto_mode_decision.
Evidence

skipped_framed_handback

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 v2.1.242 →