CASAN Domain Pack Guide

A Domain Pack is the per-project data the harness needs to govern YOUR domain. It lives at apps/<project>/domain/ and is selected via CASAN_DOMAIN_ROOT. The harness code (packages/casan-harness/) never contains domain data — this is what makes it reusable.

Scaffold template: packages/casan-devkit/templates/domain-pack/.

Layout

apps/<project>/domain/
├── domain-pack.yaml           # manifest describing this pack
├── input/
│   ├── requirement.md         # FR-xx table drives the traceability gate
│   └── architecture.md        # optional tech-stack/context
├── golden-runs/
│   └── <artifact>.golden.txt  # baseline for drift detection (H7)
├── corpus/
│   ├── redteam-corpus.jsonl   # attack vectors (H4 recall) — one JSON per line
│   ├── redteam-vectors.jsonl  # vectors for benign-fp-report / redteam metrics
│   └── benign-corpus/*.txt    # benign samples (H4 false-positive budget)
└── traceability-map.json      # FR-xx → code files + test files (+ optional symbols/lines)

Each piece

input/requirement.md — must contain a | FR-xx | ... | table. The traceability gate (Plan-10) requires every FR-xx to map to ≥1 existing code file and ≥1 test file. No secrets/PII (the H4 input scan blocks them).
golden-runs/ — a canonical "good" artifact per pipeline output. drift-detect compares a run against it; similarity 1.0 = no drift. Real drift detection is proven separately.
corpus/ — red-team attack vectors (scored for H4 recall) + a benign corpus (bounds the false-positive rate). Domain-specific injections make the H4 score meaningful.
traceability-map.json — {"FR-01": {"name": "...", "code": ["apps/okr/backend/src/...", {"file":"...","symbols":["Foo"],"lines":[12]}], "tests": ["..."]}}. Symbol/line refs are optional but tighten the gate.
domain-pack.yaml — documents the above + optional threshold overrides.

Wire it up

export CASAN_DOMAIN_ROOT=apps/<project>/domain
bin/casan gate                 # runs domain-dependent suites against your pack

domain_root is also recorded per-project in packages/casan-harness/level5/project-registry.json so bin/casan reuse can prove multi-project reuse.

Reference example

The OKR app's own pack is the worked example: apps/okr/domain/ (golden-runs, corpus, input, traceability-map). Copy its shape for your domain.

Toward Plan-12 (Domain Pack SDK)

Today a pack is a directory + CASAN_DOMAIN_ROOT. Plan-12 will make it fully declarative (register a pack by manifest, no manual wiring). The domain-pack.yaml here is the seed of that manifest.

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