r/MachineLearning: What Should Context Compression Keep? Developer Compares Six AI Coding Agents and Finds Divergent Preservation Strategies

A developer who regularly uses Claude Code, Codex CLI, OpenCode, Cline, Cursor, and Amp documents how each handles long context differently: all six are converging on layered progressive compression, but they diverge sharply on what to protect when the window fills. Some agents prioritize recent user messages, others preserve tool call histories, others compress uniformly — and the post argues that this choice is the real architectural decision in agentic coding loops, not the compression ratio itself. The analysis is surfacing as a practical reference for teams evaluating coding agents or designing context management for their own production harnesses.