Bisects a failed agent-session transcript to the minimal ordered set of turns that still reproduces the recorded failure.
Tools: write_file, append_file, delete_file, run_check. See the README for the full CLI kit.
The debugger replays subsets of turns against a deterministic in-memory virtual filesystem (no live model calls, no disk writes) and uses Zeller's ddmin algorithm to find a 1-minimal subsequence: every remaining turn is load-bearing — remove any one of them and the recorded failure stops reproducing.
Supported tools: write_file · append_file · delete_file · run_check. The CLI version handles arbitrary tool vocabularies via a plugin interface and writes .min.json minimal-repro artifacts.