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My wishlist for 2026: Anthropic / OpenAI expose “how compaction is executed” to plugin authors for their CLI tools.

This technique should be something you could swap in for whatever Claude Code bakes in — but I don’t think the correct hooks or functionality is exposed.

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Isn’t codex open source and you can just go read what they do?

I have read the gemini source and it’s a pretty simple prompt to summarize everything when the context window is full

It should be noted that OpenAI now has a specific compaction API which returns opaque encrypted items. This is AFAICT different from deciding when to compact, and many open source tools should indeed be inspectable to that regard.

It's likely to either be an approach like this [0] or something even less involved.

0: https://github.com/apple/ml-clara

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