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One thing I'm really fuzzy on is, if you're building a multi-model agent thingy (like, can drive with GPT5 or Sonnet), should you be thinking about context management tools like memory and autoediting as tools the agent provides, or should you be wrapping capabilities the underlying models offer? Memory is really easy to do in the agent code! But presumably Sonnet is better trained to use its own builtins.

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It boils down to information loss in compaction driven by LLM's. Either you could carefully design tools that only give compacted output with high information density so models have to auto-compact or organize information only once in a while which eventually is going to be lossy.

Or you just give loads of information without thinking much about it, assuming models will have to do frequent compaction and memory organization and hope its not super lossy.

Right, just so I'm clear here: assume you decide your design should be using a memory tool. Should you make your own with a tool call interface or should you rely on a model feature for it, and how much of a difference does it make?

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