CAIN-42 CAIN StudioCGMS · Module 2 of 5 · 13 min
AETHER-33: governed memory by design
AETHER-33 is CAIN's governed-memory product: deterministic BM25 retrieval (no model, no network), injection quarantine at write with named-human release, per-tenant SHA-256 chains with truncation detection, tombstoned deletes and lexical contradiction flags.
Every recall hit carries grants_authority: false, authority_effect: 'none' and executable: false.
Limits matter: retrieval is lexical only, injection screening misses paraphrases, contradiction detection is not semantic, and the preview has no encryption at rest.
Key points
- BM25, no model, no network.
- Quarantine with named-human release.
- Per-tenant chains, tombstones.
- grants_authority: false on every hit.
- Know the limits.
In the CAIN-42 codebase
cain-microservices/aether33/— engine, store, bm25, invariants
Practice check
Practice 1 · true or false
“AETHER-33's injection screening catches every paraphrase.”
Practice 2 · choose one