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- Do agent rules survive compaction? Claude Code, Codex, Gemini, CursorWhat Claude Code, Codex, Gemini CLI, Cursor, Copilot, OpenCode and Cline keep, drop and re-inject when they compact a long session, what the 2026 studies show about rules fading, and how to keep constraints in force. Every claim graded: tested, lab guidance, vendor eval or vibes.Article
