What it is
Hippo is a memory layer for AI agents modeled on the hippocampus: memories decay, strengthen with retrieval, and consolidate. It stores memories in SQLite with markdown mirrors and works across CLI agents and MCP clients.
How it uses Jev
The README describes an opt-in TypeSafe Jev reranker used by `hippo recall " " --reranker jev`. It reranks recalled memories, lifting R@1 from 0.41 to 0.62 on a private 300-query developer store. The README does not specify the state or typed questions passed to Jev.
Technique worth stealing
Use a reranker to shorten context: 2 Jev-ranked memories answer as well as 5 cross-encoder-ranked ones.
Try it
npm install -g hippo-memory && hippo init --scan ~
Evidence
Each line is one question put to Jev about the README. ≥ 0.60 reads as yes, ≤ 0.40 as no; in between Jev is not making a call.
- Jev-centricno0.03
- Shows a System One patternno0.12
- Handles uncertaintyno0.05
- Measuredyes0.94
- Runnableyes0.96
- Worth recommendingno0.16
- Model replicano0.05
- Problem scopescore on a 0–2 scale1.40
- About Jevyes0.79
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 23 Sept 2026.