feat(model-routing): model-check witness (big/small/unknown) + flip-tests

2026-07-15 11:00:32 +02:00
parent e5dd804e7e
commit 9984b75f90
2 changed files with 58 additions and 0 deletions
@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+# lib/model-check.sh — classify the persisted session model: big | small | unknown
+#
+# Witness for lib/model-gate.md (reflection requires a big model). Reads the
+# "model" key of the user-scope settings (the file /model rewrites — LRN-098).
+# Override the source with MODEL_CHECK_SETTINGS (tests use fixtures).
+#
+# stdout : <class>:<raw>   (raw = value found, empty if none)
+# exit   : 0 = big (fable/opus) · 2 = small (sonnet/haiku) · 3 = unknown
+set -u
+
+SETTINGS="${MODEL_CHECK_SETTINGS:-$HOME/.claude/settings.json}"
+
+raw=""
+if [ -f "$SETTINGS" ]; then
+  raw="$(python3 - "$SETTINGS" 2>/dev/null <<'PY'
+import json, sys
+try:
+    v = json.load(open(sys.argv[1])).get("model", "")
+    print(v if isinstance(v, str) else "")
+except Exception:
+    print("")
+PY
+)"
+fi
+
+norm="$(printf '%s' "$raw" | tr '[:upper:]' '[:lower:]')"
+case "$norm" in
+  *opusplan*)       printf 'unknown:%s\n' "$raw"; exit 3 ;; # opus-for-plan, sonnet otherwise — ambiguous
+  *fable*|*opus*)   printf 'big:%s\n'     "$raw"; exit 0 ;;
+  *sonnet*|*haiku*) printf 'small:%s\n'   "$raw"; exit 2 ;;
+  *)                printf 'unknown:%s\n' "$raw"; exit 3 ;;
+esac