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MetaBrain

A local document memory for AI agents

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Hello there HNI experimented with agentic coding recently and I felt the need to track more contextual data by project. Also I felt the need to be able to go beyond the 1D chat to communicate with agents.So I created a local document memory, that is discoverable by agents themselves. The CLI is designed to be easy to pick up by agents. It allows humans to collaborate too by reading / searching / editing documents in the store.I have a Mac native GUI in the review process, I hope it will show up in the App Store soon.You can try it easily, instructions here: https://metabrain.eu/ Here is the GitHub https://github.com/OpenCow42/metaBrainThe project is also an experiment for me to build some swift project truly cross platform (Mac / Linux / Windows) It is open-sourced with the same license as LevelDB that I wrapped in swift to do this project.The agents (and humans) can retrieve content quickly with a search, allowing to re-injecting specific knowledge in a specific context during agentic work. It’s funny, I’ve thought of "inference rule base" as something of a derelict idea of the old functional expert systems. Now that I start working with agents I feel more and more the need to go pick previously working solutions dynamically in such a base.I’d be happy to get feedback. Product fit wise, would this be useful to you or is this just me who is happy with it ?Finally I had fun with the compression of documents, it tries ZSTD quick, if it does not compress the data by more than 10 percent it stores data uncompressed, else it does a ZSTD level 9 compression on the data. I picked up this trick form OpenZFS.Thanks

HN · launched Jun 2, 2026 · 8 upvotes (top 50%) · 0 views

Niche: ai agent memory infrastructure · 350 launches, 11 in the last 7 days ▼ -58% · Explore this niche →

Category and tags

  • Horizontal
  • Data infrastructure
  • Developer
  • AI-native
  • Commercial product

Visit website ↗ Source listing ↗

Could you build this?

Yes It is a standard local key-value store wrapper and CLI tool using LevelDB to store markdown documents and metadata for AI agents.

Discussion

2 comments analyzed.

Concerns raised: Advanced context pollution risk for agentic tasks, Unclear differentiation from existing note-taking/archival tools

Competitors

Other products that read as similar to this one : 538 launches clear the similarity bar, closest 8 shown.

Attention rank: #291 of 539 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).

Launched 214 days after the earliest competitor.

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