CLAUDE.md trimming in non-interactive runs now uses a total size budget

What

CLAUDE.md files hold instructions that Claude Code loads into every conversation. A non-interactive session is one that runs with no person typing, such as a script. The rule for cutting oversized CLAUDE.md files in these sessions has been rewritten.

• Before, each oversized file was cut against a size limit set by the model. This was controlled by the remote switch tengu_velvet_possum, which is no longer read in this build.
• Now Claude Code works out a total budget from the main model and the autoCompactWindow setting, which controls how full the conversation gets before Claude Code summarizes it.
• Files are cut only when all instruction files together exceed that budget, and only when the Project files alone account for the overage.
• When that happens, each Project CLAUDE.md file is cut to about a tenth of the budget divided by the number of Project files. Each file is marked so that only its beginning is kept.
• This whole step sits behind the new remote switch tengu_temporal_haven, which falls back to false in the code.
• Outside the switch, two new internal checks (Nu() and tf(r)) must pass. The old checks for which tools were present are replaced by a single check that one tool is absent.

In readings taken before this release, Anthropic's servers returned both tengu_temporal_haven and tengu_velvet_possum off for this site's account and for a signed-out baseline. No reading has been taken under this release.

Why

If the switch is turned on, a large project CLAUDE.md is no longer cut just for being big on its own. It is cut only when your instructions together would not fit the budget, so headless runs may keep more or less of it than before.