Aletheia
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Reference

Glossary

A quick reference for recurring Aletheia terms in docs, APIs, and benchmarking.

Core terms

  • AgentObservation: primary stored memory record.
  • Companion memory: derived fact or summary linked to source turn.
  • Supersession: invalidating old fact with newer fact.
  • RRF: reciprocal rank fusion for combining retrieval lists.
  • TTL: hard expiry threshold for memory eligibility.

Retrieval terms

  • Bi-encoder: independent query/document embeddings.
  • Cross-encoder: joint query+document relevance model.
  • HNSW: approximate nearest-neighbor graph index.
  • BM25: probabilistic lexical scoring method.

Operational terms

  • Reconciliation: repairing secondary indexes from durable store.
  • Canary eval: small fixed test set for release health checks.
  • Entity scope: ownership boundary used to isolate memory retrieval.