Students open-source a no-vector-DB MCP memory server with 30 tools and trust decay
Neither-Witness-6010 · reddit · 2026-09-17
Three students released cognicore-env (MIT, on PyPI), an MCP server giving agents persistent memory across sessions, working today with Claude Code and Cursor.
- No vector DB: retrieval is TF-IDF over the Python stdlib — no embedding server, Docker, or API keys; runs in-process.
- 30 tools: recording, retrieval, trust decay, and portable transfer of memories.
- Lifecycle model: each memory has a category, confidence score, and lifecycle (observed/verified/transferable/promoted); trust decays over time, memories verified by actually running commands get promoted, human corrections persist.
- Portable transfer: memories export as sealed bundles with proof (command, result, exit code, output hash) plus a chain of custody across agents; tested across four platforms.
Honest benchmarks: 78.8–85.2% task accuracy at 5 retrieved chunks, 87.2–92.8% at 10, flat at 20; TF-IDF limitations documented in the README. Currently 64 stars and 12K downloads; the team is deciding whether to keep building it next semester.
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