I would be concerned with context management consuming limited attention resources.
Do you want your agent solving its own memory crisis, or do you want it solving the actual task? It can probably do both at the same time, but I suspect there is a non trivial cost associated with this.
A separate hypervisor agent that manages the main agent's context would be much better in my experience. You can run it on a different schedule and the main agent has to spend zero tokens thinking about it. This also makes it a lot easier to control when caches will be missed.
Wow. Context management is one of the big remaining hassles with modern LLMs so this could be big. The obvious complication is cache busting so it's also exciting they investigated solutions for that.
Can't we do this trick today with any model? Just send the file as next context. Of course you pay the price for cache misses, depending how deep you make changes, while CLM just ignores the recomputation.
One approximation of this is the experimental context management Codex has been moving towards (not released yet). Rather than relying on summary compaction, the model maintains notes as it works and as it approaches the context limit. A new session is just a fresh context with those notes attached, and a pointer back to the previous session.
Not exactly like what this paper is suggesting, but similar in the sense it lets the model decide what and how to persist across turns.
I recreated this in Pi, with a max token limit on how long the note can be, to pressure the model to be concise. Ends up being cheaper than summary compaction too.
Interesting. It matches my manual workflow with all harnesses (including vanilla web ChatGPT/Gemini/Claude) for the past year or so: when the session gets compacted, or (ideally) when I feel it's about to be, I just tell it to write a handover note, and start a new session.
With some specific workflow I use in some cases (involving leaving long-lived intermediary artifacts), this turned into me pasting a path to handover file in previous agent's session, and handover itself directs the agent to key files from that session to read, and that's it. So far, with this process, at no point I felt any quality degradation (though early on I often see "I need to check how my predecessor did ${something}", followed by surgical spelunking of past chat's history), even as I carry a single piece of complex analytical work over 5+ sessions.
That is similar to what I am thinking... not just edit the context as a file or string, but have a way to evict blocks and replace them with summary notes and also be able to retrieve them on demand.
No public repo but it's not too difficult to point a LLM at the general idea. Since Codex is open source, you can even take a look at how they do it. Here is what the model is instructed to do in codex (look at "guidance_message"): https://github.com/openai/codex/blob/d91294c39edb93d204926b3...
I wonder how bad the performance would be if they plain ignored the whole rotary encoding dance and just back-filled precisely the parts of the cache that changed directly. Would it break the model? Confuse the model? Or would the model internally correct for it?
> We implement this by treating the context as a file and allowing the model to make unrestricted updates to this file. This allows the model to learn what is most important to maintain in context, and naturally extends to multi-agent systems where multiple agent contexts coexist as files.
So, is this like RAM, just for an LLM? Do we have to reinvent MMUs for LLMs and all the abstractions that come along with it?
This was my gut reaction as well but I think this is just a poor abstract. What they actually did appears to be much deeper than reinventing agents.md
I would be concerned with context management consuming limited attention resources.
Do you want your agent solving its own memory crisis, or do you want it solving the actual task? It can probably do both at the same time, but I suspect there is a non trivial cost associated with this.
A separate hypervisor agent that manages the main agent's context would be much better in my experience. You can run it on a different schedule and the main agent has to spend zero tokens thinking about it. This also makes it a lot easier to control when caches will be missed.
Maybe have A second model do the management?
Looks like they tested that in the paper, and the code allows for it as well. https://github.com/facebookresearch/context-language-models/... Of course, this is for suggesting context management strategies rather than the actual management afaict.
Yeah maybe a second model can do the actual management
Yeah, that would be the canonical solution. Modularity is better
Wow. Context management is one of the big remaining hassles with modern LLMs so this could be big. The obvious complication is cache busting so it's also exciting they investigated solutions for that.
Related: "Recursive Language Models" https://arxiv.org/abs/2512.24601
Eventually the CLM will be a separate model co-trained with the actual model right?
And there will be multiple contexts like hot vs cold pages in DBs.
Speaking of which I am predicting a "Context as a DB" paper within one year
Can't we do this trick today with any model? Just send the file as next context. Of course you pay the price for cache misses, depending how deep you make changes, while CLM just ignores the recomputation.
One approximation of this is the experimental context management Codex has been moving towards (not released yet). Rather than relying on summary compaction, the model maintains notes as it works and as it approaches the context limit. A new session is just a fresh context with those notes attached, and a pointer back to the previous session.
Not exactly like what this paper is suggesting, but similar in the sense it lets the model decide what and how to persist across turns.
I recreated this in Pi, with a max token limit on how long the note can be, to pressure the model to be concise. Ends up being cheaper than summary compaction too.
Interesting. It matches my manual workflow with all harnesses (including vanilla web ChatGPT/Gemini/Claude) for the past year or so: when the session gets compacted, or (ideally) when I feel it's about to be, I just tell it to write a handover note, and start a new session.
With some specific workflow I use in some cases (involving leaving long-lived intermediary artifacts), this turned into me pasting a path to handover file in previous agent's session, and handover itself directs the agent to key files from that session to read, and that's it. So far, with this process, at no point I felt any quality degradation (though early on I often see "I need to check how my predecessor did ${something}", followed by surgical spelunking of past chat's history), even as I carry a single piece of complex analytical work over 5+ sessions.
That is similar to what I am thinking... not just edit the context as a file or string, but have a way to evict blocks and replace them with summary notes and also be able to retrieve them on demand.
Do you have a public repo for your approach?
No public repo but it's not too difficult to point a LLM at the general idea. Since Codex is open source, you can even take a look at how they do it. Here is what the model is instructed to do in codex (look at "guidance_message"): https://github.com/openai/codex/blob/d91294c39edb93d204926b3...
Memento
The biggest discovery might actually be that they ignored regular caching rules and kept invalid cache suffixes and it didn't hurt performance
I wonder how bad the performance would be if they plain ignored the whole rotary encoding dance and just back-filled precisely the parts of the cache that changed directly. Would it break the model? Confuse the model? Or would the model internally correct for it?
The rotary issue is a simple rotation, cheap, no reason to skip it.
But this is the kind of thing you could ask your agent to test locally.
> We implement this by treating the context as a file and allowing the model to make unrestricted updates to this file. This allows the model to learn what is most important to maintain in context, and naturally extends to multi-agent systems where multiple agent contexts coexist as files.
So, is this like RAM, just for an LLM? Do we have to reinvent MMUs for LLMs and all the abstractions that come along with it?
Bitter Lesson showing up yet again, this time in context management?
Looks great!
that's interesting!