Topiax Brief #2 — compliance-friendly retrieval patterns

Retrieval-augmented assistants fail audits when sources are ambiguous or access control is bolted on late. This Brief outlines patterns we use so corpus boundaries, identity, and logging stay aligned from day one.

Focused desk work — documentation, access reviews, and traceable decisions

Corpus boundaries are a contract

Treat each index as a contract with a named owner and explicit inclusion rules.

If two corpora must never be mixed in one answer, enforce that before the LLM call — not via prompt instructions alone.

Confidence scores drive workflow — not UX glitter

Scores should map to routes: answer directly, ask a clarifying question, or enqueue for human review with retrieved chunks attached.

Pair thresholds with periodic calibration: sample human resolutions vs model scores and adjust cut-offs quarterly.

Logging that passes second-line review

Second-line teams rarely object to structured metadata. They object to surprises.

Minimum audit payload per interaction:

• Who — role / tenant (not necessarily individual unless required).
• What — corpus ids, document versions, chunk ids.
• Outcome — answer path, escalation reason code, human override flag.

Next issues

Later Briefs dig into orchestration (LangGraph-style state machines for finance) and incident drills for LLM-backed services — same tone, tighter format.

If these patterns conflict with your internal standards, treat this Brief as a discussion checklist with legal — not a substitute for your policy.