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Show HN: MCP Memory – Fast Agent Memory Using Google's OKF and SQLite FTS5

46 points by pcbmaker20 5 hours ago | 22 comments

jrflo 3 hours ago

Cool idea. Why is this beneficial over just using markdown files and allowing agents to grep for whatever they need? I've tried various MCP things in the past and I've found they tend to slow down the agent and waste tokens more than they end up helping, but a better memory system is 100% needed for agents.

cstrahan 59 minutes ago

The memories are stored as OKF (Open Knowledge Format), which is markdown + frontmatter (+ constraints/schema imposed thereon).

Having an inverted index (as with FTS5) is useful in that, for a basic single-term lookup, you reduce a sequential scan, O(N), down to O(log N). For small N, the performance difference might not be meaningful. Performance gap widens with more sophisticated queries (boolean operators, ranking, etc).

agentifysh 2 hours ago

im asking the same thing myself for personal projects seems markdown files is best.

i can see for public facing deployments agent memory like this could result in faster roundtrips.

rgbrgb 3 hours ago

for one, the mcp-server architecture makes it usable from claude.ai and other surfaces where you have mcp but no filesystem. there are claude-specific workarounds (workspaces) but you lose portability across systems.

jrflo 2 hours ago

Hmm, ok. I guess I rarely use the web interface and everything that I have agents record as "memory" in markdown is always accessible locally. If I'm accessing something remotely, I use the ChatGPT app with remote which connects directly to the host computer.

Natalia724 2 hours ago

[dead]

ksajadi 2 hours ago

For those looking for similar tools, there is also https://markbase.cloud/ as a hosted service. (Disclaimer: we built it for internal use first and would like to open source with the community help as we don’t have much experience in OSS maintenance)

rcarmo 4 hours ago

Nice to see more OKF-based approaches. My entry in this field is https://rcarmo.github.io/projects/memento/, which I’ve been running for a few months now.

ejp 4 hours ago

Since you built something on OKF, how would you contrast it with knowledge graph implementations? How do you manage the ontology of what to keep knowledge about? Any cases where traversal would have helped?

dofm 4 hours ago

Please excuse my noob-ish, naïve question, but to what extent is the business of getting the LLM to actually consult memory a model-dependent thing? Do you have to introduce the tool and guide models with different language for different model families?

Looking at your tool descriptions (as wit the ones on the original post) I wonder if this something perhaps only current frontier models will do, but the systems themselves seem like they'd be even more useful for open weights models with shorter working contexts.

esafak 4 hours ago

I have seen the value of recording past sessions but I am more skeptical of the value in recording facts, which may soon become stale, about a constantly changing code base. Got benchmarks?

sho 4 hours ago

Well, do you see the value of writing notes for yourself occasionally, even though they might soon become stale in your constantly changing environment? Yes, right?

Same principle. It's a good idea to have a schedule to clean them up periodically - an idea you can also put into a note.

esafak 12 minutes ago

I'll write one off notes for myself, but I am not going to do that in the code base unless it is really high value; it does not scale. The only place I write myself now is AGENTS.md

healthycoder 3 hours ago

How is this any different from all the other Memory stuff we have? mem0 etc etc that do the same thing?

rgbrgb 2 hours ago

agree there are a lot of these but they're all pretty simple (including mine [0]) so I think building your own and playing around with architecture is useful and fun.

[0]: https://setoku.com

FitchApps 4 hours ago

Looks very interesting. Can you explain for noobs why using Google's OKF format and not plain MD files?

pcbmaker20 4 hours ago

OKF is basically md files with front-matter for meta data

clemens1010 4 hours ago

did you test if that actually outperforms local claude code memory by any metric?

rgbrgb 3 hours ago

that's a good idea. how might you test this? could also include a codex memory test.

I'm guessing having a portable memory that's comparable with first party memory is the goal.

0c3ca83 2 hours ago

How is this different from what's built into Claude?

bearjaws 3 hours ago

Another week, another agent memory system that is about the same as grep in a memory/ directory.

cstrahan 56 minutes ago

I'm not sure I follow. Are you suggesting that full text search systems are ultimately a convoluted way of performing O(N) regex searches? If not, I don't see how you arrive at the conclusion that this is "the same as grep in a memory/ directory".

myshapeprotocol 3 hours ago

Using SQLite FTS5 for fast agent memory is such a pragmatic architectural choice. Great Show HN project.