Under the hood
Internal eval-test reporting now recognizes 'concurrency' and 'withheld' as valid result fields
What
An internal list of recognized field names for evaluation/test result reports (used by Claude Code's own testing harness) now includes concurrency and withheld, alongside existing fields like casesPassed, casesTotal, weight, and without.
Why
This is internal tooling for Claude Code's own test infrastructure rather than something a user interacts with directly.