You can compact contexts with zero-cost on Claude by https://github.com/manji-0/claude-blackhole
GitHubGitHub - manji-0/claude-blackhole: Deterministic compaction, observational memory and session recall for Claude Code (a port of pi-blackhole)Deterministic compaction, observational memory and session recall for Claude Code (a port of pi-blackhole) - manji-0/claude-blackhole