diff --git a/scripts/tests/ygg-engine.test.sh b/scripts/tests/ygg-engine.test.sh
index 710d70f..9f5dc95 100755
--- a/scripts/tests/ygg-engine.test.sh
+++ b/scripts/tests/ygg-engine.test.sh
@@ -37,7 +37,13 @@ cat > "$T/bin/devcontainer" <<'EOF2'
 #!/usr/bin/env bash
 echo "${FAKE_CLI:-0.89.0}"
 EOF2
-chmod +x "$T/bin/podman" "$T/bin/devcontainer"
+# mountpoint -q DIR succeeds only for a folder that holds a .fake-mounted file (nothing is really mounted here).
+cat > "$T/bin/mountpoint" <<'EOF2'
+#!/usr/bin/env bash
+[ -e "${2:?}/.fake-mounted" ]
+EOF2
+chmod +x "$T/bin/podman" "$T/bin/devcontainer" "$T/bin/mountpoint"
+touch "$T/bind/.fake-mounted"
 export PATH="$T/bin:$PATH" YGG_BIND="$T/bind" YGG_ENGINE_TIMEOUT=2
 
 run bash "$S/ygg-engine.sh" check --folder "$D"
@@ -69,6 +75,10 @@ check "check refuses another devcontainer CLI version" bash -c "[ $rc = 2 ]" &&
 YGG_BIND="$T/nowhere" run bash "$S/ygg-engine.sh" check --folder "$D"
 check "check refuses a missing bind mount" bash -c "[ $rc = 2 ]" && has "bind mount"
 
+mkdir -p "$T/plain"
+YGG_BIND="$T/plain" run bash "$S/ygg-engine.sh" check --folder "$D"
+check "check refuses a folder that exists but has nothing mounted on it" bash -c "[ $rc = 2 ] && grep -q 'nothing mounted' '$T/out' && grep -q 'sudo mount --bind' '$T/out'"
+
 D2="$T/other"; mkdir -p "$D2"; printf 'sandbox:\n  engine: unix://%s/gone.sock\n' "$T" > "$D2/factory.yaml"
 run bash "$S/ygg-engine.sh" check --folder "$D2"
 check "check names a socket that is not there" bash -c "[ $rc = 2 ]" && has "gone.sock is not there"
diff --git a/scripts/tests/ygg-evidence.test.sh b/scripts/tests/ygg-evidence.test.sh
index 71a572a..8a43ae2 100755
--- a/scripts/tests/ygg-evidence.test.sh
+++ b/scripts/tests/ygg-evidence.test.sh
@@ -45,7 +45,12 @@ esac
 EOF
 # shellcheck disable=SC2016  # the printf format holds a literal ${...}, not an expansion
 printf '#!/usr/bin/env bash\necho "${FAKE_CLI_VERSION:-0.89.0}"\n' > "$T/bin/devcontainer"
-chmod +x "$T/bin/ygg" "$T/bin/devcontainer"
+# mountpoint -q DIR succeeds only for a folder that holds a .fake-mounted file (nothing is really mounted here).
+cat > "$T/bin/mountpoint" <<'EOF'
+#!/usr/bin/env bash
+[ -e "${2:?}/.fake-mounted" ]
+EOF
+chmod +x "$T/bin/ygg" "$T/bin/devcontainer" "$T/bin/mountpoint"
 export PATH="$T/bin:$PATH"
 
 # --- ygg-evidence.sh on a project with a ledger.
@@ -91,9 +96,10 @@ unset SOME_API_KEY
 # --- ygg-smoke-loop.sh.
 D="$T/ygg-it"; mkdir -p "$D"
 printf 'CLAUDE_CODE_OAUTH_TOKEN=%s\n' "$SECRET" > "$T/factory.env"
-mkdir -p "$T/bind"
+mkdir -p "$T/bind" "$T/plain"
+touch "$T/bind/.fake-mounted"
 export YGG_BIND="$T/bind" YGG_ODIN="$T/odin" YGG_CMD="$T/bin/ygg"
-args=(--folder "$D" --env "$T/factory.env" --realm "$T/realm")
+args=(--folder "$D" --env "$T/factory.env" --graph "$T/realm")
 run "$S/ygg-smoke-loop.sh" "${args[@]}"
 check "a missing factory.yaml is refused" test "$rc" -eq 2
 touch "$D/factory.yaml"
@@ -101,6 +107,8 @@ FAKE_CLI_VERSION=0.88.0 run "$S/ygg-smoke-loop.sh" "${args[@]}"
 check "a wrong devcontainer version is refused" test "$rc" -eq 2
 YGG_BIND="$T/missing" run "$S/ygg-smoke-loop.sh" "${args[@]}"
 check "a missing bind mount is refused" test "$rc" -eq 2
+YGG_BIND="$T/plain" run "$S/ygg-smoke-loop.sh" "${args[@]}"
+check "a bind folder with nothing mounted on it is refused (loop)" bash -c "[ $rc = 2 ] && grep -q 'nothing mounted' '$T/out' && grep -q 'sudo mount --bind' '$T/out'"
 FAKE_RUN_RC=4 run "$S/ygg-smoke-loop.sh" --build "${args[@]}"
 check "the exit code of the run is the script's" test "$rc" -eq 4
 check "the project is made" test -f "$D/smoke-loop/umbrella.yaml"
@@ -133,11 +141,13 @@ printf 'mode: unattended\n' > "$R/factory.yaml"
 run "$S/ygg-smoke-realms.sh" "${rargs[@]}"
 check "a config with no realms section is refused" test "$rc" -eq 2
 check "and the refusal says why" has "no realms section"
-printf 'mode: unattended\nrealms:\n  dir: /somewhere\n' > "$R/factory.yaml"
+printf 'mode: unattended\nrealms:\n  dir: /somewhere\ngraphs:\n  dir: /somewhere\n' > "$R/factory.yaml"
 FAKE_CLI_VERSION=0.88.0 run "$S/ygg-smoke-realms.sh" "${rargs[@]}"
 check "a wrong devcontainer version is refused (realms)" test "$rc" -eq 2
 YGG_BIND="$T/missing" run "$S/ygg-smoke-realms.sh" "${rargs[@]}"
 check "a missing bind mount is refused (realms)" test "$rc" -eq 2
+YGG_BIND="$T/plain" run "$S/ygg-smoke-realms.sh" "${rargs[@]}"
+check "a bind folder with nothing mounted on it is refused (realms)" bash -c "[ $rc = 2 ] && grep -q 'nothing mounted' '$T/out' && grep -q 'sudo mount --bind' '$T/out'"
 FAKE_RUN_RC=5 run "$S/ygg-smoke-realms.sh" --build "${rargs[@]}"
 check "the exit code of the run is the script's (realms)" test "$rc" -eq 5
 projects=("$R"/smoke-realms-*/)
@@ -150,16 +160,27 @@ FAKE_RUN_RC=0 run "$S/ygg-smoke-realms.sh" "${rargs[@]}"
 projects=("$R"/smoke-realms-*/)
 check "each run gets a project of its own" test "${#projects[@]}" -eq 2
 
-# The same script runs the content smoke run: another lead realm, a brief, and a tag for its files.
+# The same script runs the content smoke run: another graph, a brief, and a tag for its files.
 printf 'a brief\n' > "$T/brief.md"
 sleep 1 # a project is named by the second it is made in
-FAKE_ARGS_LOG="$T/args.log" FAKE_RUN_RC=0 run "$S/ygg-smoke-realms.sh" "${rargs[@]}" --realm midgard-react --brief "$T/brief.md" --tag h15
-check "the lead realm and the brief are given to the run" grep -q -- "--realm midgard-react --brief $T/brief.md" "$T/args.log"
+FAKE_ARGS_LOG="$T/args.log" FAKE_RUN_RC=0 run "$S/ygg-smoke-realms.sh" "${rargs[@]}" --graph software --brief "$T/brief.md" --tag h15
+check "the graph and the brief are given to the run" grep -q -- "--graph software --brief $T/brief.md" "$T/args.log"
+check "no run argument holds --realm" bash -c "! grep -q -- '--realm' '$T/args.log'"
 check "the files of the run carry the tag" test -f "$R/h15-run.txt" -a -f "$R/h15-report.txt"
 run "$S/ygg-smoke-realms.sh" "${rargs[@]}" --brief "$T/nope.md"
 check "a brief that is not there is refused" test "$rc" -eq 2
 sleep 1
 FAKE_ARGS_LOG="$T/args2.log" run "$S/ygg-smoke-realms.sh" "${rargs[@]}"
-check "without options the run is the smoke-lead realm with no brief, as before" bash -c "grep -q -- '--realm smoke-lead' '$T/args2.log' && ! grep -q -- '--brief' '$T/args2.log'"
+check "without options the run is the smoke-lead graph folder of odin with no brief" bash -c "grep -q -- '--graph $T/odin/testdata/smoke-realms/smoke-lead' '$T/args2.log' && ! grep -q -- '--brief' '$T/args2.log' && ! grep -q -- '--realm' '$T/args2.log'"
+printf 'mode: unattended\nrealms:\n  dir: /somewhere\n' > "$R/factory.yaml"
+run "$S/ygg-smoke-realms.sh" "${rargs[@]}" --graph software
+check "a graph given by name needs a config with a graphs section" test "$rc" -eq 2
+check "and the refusal says why" has "no graphs section"
+printf 'mode: unattended\nrealms:\n  dir: /somewhere\n# graphs:\n#   dir: /somewhere\n' > "$R/factory.yaml"
+run "$S/ygg-smoke-realms.sh" "${rargs[@]}" --graph software
+check "a commented-out graphs section does not count" bash -c "[ $rc = 2 ] && grep -q 'no graphs section' '$T/out'"
+printf 'mode: unattended\nrealms:\n  dir: /somewhere\n  graphs:\n    dir: /somewhere\n' > "$R/factory.yaml"
+run "$S/ygg-smoke-realms.sh" "${rargs[@]}" --graph software
+check "a graphs key indented under another key does not count" bash -c "[ $rc = 2 ] && grep -q 'no graphs section' '$T/out'"
 
 exit "$fail"
diff --git a/scripts/tests/ygg-smoke-grade.test.sh b/scripts/tests/ygg-smoke-grade.test.sh
index 1d5e149..40f3a95 100755
--- a/scripts/tests/ygg-smoke-grade.test.sh
+++ b/scripts/tests/ygg-smoke-grade.test.sh
@@ -165,8 +165,10 @@ check "a missing factory.yaml is refused" test "$rc" -eq 2
 printf 'sandbox:\n  engine: unix:///run/ygg-test.sock\n' >"$D/factory.yaml"
 run "$S/ygg-smoke-grade.sh" --folder "$D" --tasks "$T/nowhere" --odin "$T/odin"
 check "a missing task folder is refused" test "$rc" -eq 2
-run "$S/ygg-smoke-grade.sh" "${gargs[@]}"
+FAKE_ARGS_LOG="$T/gargs.log" run "$S/ygg-smoke-grade.sh" "${gargs[@]}" --build
 check "a good run passes every check and exits 0" test "$rc" -eq 0
+check "ygg run is given --graph and never --realm (grade)" bash -c "grep -q '^run .*--graph $T/odin/testdata/smoke-grade' '$T/gargs.log' && ! grep '^run ' '$T/gargs.log' | grep -q -- '--realm'"
+check "ygg sandbox build keeps --realm (grade)" bash -c "grep '^sandbox build ' '$T/gargs.log' | grep -q -- '--realm $T/odin/testdata/smoke-grade'"
 check "the reference case grades 1" has "smoke-grade: reference reward 1"
 check "the empty case grades 0" has "smoke-grade: empty reward 0"
 check "no check failed" hasnt "FAIL"
@@ -238,6 +240,8 @@ FAKE_ARGS_LOG="$T/args.log" run "$S/ygg-smoke-real.sh" "${rargs[@]}" --dry-run
 check "a dry run exits 0" test "$rc" -eq 0
 check "a dry run says what it would run, under a wall clock" has "would run: timeout --signal=INT --kill-after=2m 90m"
 check "a dry run runs the doctor" grep -q '^doctor ' "$T/args.log"
+check "a dry run prints a run with --graph" has "--graph '$T/odin/testdata/smoke-grade'"
+check "and the printed run holds no --realm" bash -c "! grep 'would run: timeout' '$T/out' | grep -q -- '--realm'"
 check "a dry run does not start the run" test -z "$(grep '^run ' "$T/args.log")"
 check "a dry run does not load the credentials, not even for the doctor" test -z "$(grep '^loaded:' "$T/args.log")"
 check "a dry run prints the caps" has "per_run: { tokens: 400000, turns: 100, usd: 3 }"
@@ -258,6 +262,8 @@ check "the credentials were loaded for the run" grep -q '^loaded:run$' "$T/args3
 check "and not for the first doctor, which comes before the run" test "$(head -n 1 "$T/args3.log" | cut -d' ' -f1)" = doctor
 check "no credential value is printed" hasnt "$MARK_A"
 check "nor the second" hasnt "$MARK_B"
+check "ygg run is given --graph and never --realm (real)" bash -c "grep -q '^run .*--graph $T/odin/testdata/smoke-grade' '$T/args3.log' && ! grep '^run ' '$T/args3.log' | grep -q -- '--realm'"
+check "ygg sandbox build keeps --realm (real)" bash -c "grep '^sandbox build ' '$T/args3.log' | grep -q -- '--realm $T/odin/testdata/smoke-grade'"
 check "the score is printed" has "reward 0, fail-to-pass 6/6"
 check "the cost is printed from the ledger" has 'cost $0.3750'
 check "and the cap beside it" has 'per_run cap is $3'
diff --git a/scripts/ygg-engine.sh b/scripts/ygg-engine.sh
index f6b273a..8140864 100755
--- a/scripts/ygg-engine.sh
+++ b/scripts/ygg-engine.sh
@@ -51,6 +51,7 @@ fi
 got="$(devcontainer --version 2>/dev/null | head -n 1 || true)"
 [ "$got" = "$want" ] || fail "the devcontainer CLI is '${got:-missing}', want $want; install it in $dir/dc (npm install --prefix $dir/dc @devcontainers/cli@$want)"
 [ -d "$bind" ] || fail "the bind mount $bind is missing; a WSL restart removes it"
+mountpoint -q "$bind" || fail "the bind mount $bind is a folder with nothing mounted on it; run: sudo mount --bind <the host folder of factory.yaml's mount> $bind (a WSL restart removes it, see Phase 3 v0-H07)"
 
 case "$mode" in
   check)
diff --git a/scripts/ygg-smoke-grade.sh b/scripts/ygg-smoke-grade.sh
index 0b41db8..9930d4a 100755
--- a/scripts/ygg-smoke-grade.sh
+++ b/scripts/ygg-smoke-grade.sh
@@ -178,7 +178,7 @@ oneCase() { # oneCase CASE: build the project, run it to its end, grade it again
   # An interrupt or an early exit must not leave the poller running.
   trap 'touch "$watchlog.stop"; kill "$watcher" 2>/dev/null || true' EXIT
   set +e
-  eval "$ygg run --project '$project' --config '$v/factory.yaml' --realm '$realm' --brief '$tasks/$task/instruction.md'" 2>&1 | tee "$v/run.txt"
+  eval "$ygg run --project '$project' --config '$v/factory.yaml' --graph '$realm' --brief '$tasks/$task/instruction.md'" 2>&1 | tee "$v/run.txt"
   rc="${PIPESTATUS[0]}"
   set -e
   id="$(find "$project/.factory/runs" -mindepth 1 -maxdepth 1 -type d -printf '%f\n' 2>/dev/null | sort | tail -n 1 || true)"
diff --git a/scripts/ygg-smoke-loop.sh b/scripts/ygg-smoke-loop.sh
index 1cd3208..2c36fac 100755
--- a/scripts/ygg-smoke-loop.sh
+++ b/scripts/ygg-smoke-loop.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # Run the loop smoke realm (v0-H11) with its checks, then print the evidence report.
-#   ygg-smoke-loop.sh [--build] [--folder DIR] [--env FILE] [--realm DIR] [--clip]
+#   ygg-smoke-loop.sh [--build] [--folder DIR] [--env FILE] [--graph DIR] [--clip]
 # Needs: DIR/factory.yaml (the operator's config; this script never writes it), the devcontainer CLI 0.89.0
 # first on PATH (or in DIR/dc/node_modules/.bin), the engine up and the bind mount present. It
 #   1. checks the devcontainer CLI version and the bind mount, and stops with a reason if one is wrong;
@@ -12,7 +12,7 @@
 #   5. runs the realm and keeps its raw output in DIR/h11-run.txt (shown live as ygg prints it: do not paste
 #      that file, paste the report);
 #   6. prints the report of ygg-evidence.sh, with the credentials removed (also in DIR/h11-report.txt): paste it.
-# Defaults: DIR=$HOME/ygg-it, FILE=$HOME/.config/ouroboric/factory.env, realm=testdata/smoke-loop of the
+# Defaults: DIR=$HOME/ygg-it, FILE=$HOME/.config/ouroboric/factory.env, graph=testdata/smoke-loop of the
 # odin folder. For tests and other machines: YGG_CMD (how ygg runs), YGG_ODIN (the odin folder),
 # YGG_BIND (the bind mount, default /mnt/wsl/ygg-bind) and YGG_CLI_VERSION (default 0.89.0).
 set -euo pipefail
@@ -23,9 +23,9 @@ while [ $# -gt 0 ]; do
     --build) build=1; shift ;;
     --folder) dir="${2:?--folder needs a folder}"; shift 2 ;;
     --env) envfile="${2:?--env needs a file}"; shift 2 ;;
-    --realm) realm="${2:?--realm needs a folder}"; shift 2 ;;
+    --graph) realm="${2:?--graph needs a folder}"; shift 2 ;;
     --clip) clip=(--clip); shift ;;
-    *) echo "usage: ygg-smoke-loop.sh [--build] [--folder DIR] [--env FILE] [--realm DIR] [--clip]" >&2; exit 2 ;;
+    *) echo "usage: ygg-smoke-loop.sh [--build] [--folder DIR] [--env FILE] [--graph DIR] [--clip]" >&2; exit 2 ;;
   esac
 done
 odin="${YGG_ODIN:-$HERE/../../yggdrasil/odin}"
@@ -37,6 +37,7 @@ export PATH="$dir/dc/node_modules/.bin:$PATH"
 got="$(devcontainer --version 2>/dev/null | head -n 1 || true)"
 [ "$got" = "$want" ] || { echo "smoke-loop: devcontainer CLI is '${got:-missing}', want $want; put the right one first on PATH" >&2; exit 2; }
 [ -d "$bind" ] || { echo "smoke-loop: the bind mount $bind is missing; a WSL restart removes it (see Phase 3 v0-H07)" >&2; exit 2; }
+mountpoint -q "$bind" || { echo "smoke-loop: the bind mount $bind is a folder with nothing mounted on it; run: sudo mount --bind <the host folder of factory.yaml's mount> $bind (a WSL restart removes it, see Phase 3 v0-H07)" >&2; exit 2; }
 
 project="$dir/smoke-loop"
 if [ ! -d "$project" ]; then
@@ -70,7 +71,7 @@ set +e
   . "$envfile"
   set +a
   if [ "$build" -eq 1 ]; then eval "$ygg sandbox build --config '$dir/factory.yaml' --realm '$realm'"; fi
-  eval "$ygg run --project '$project' --config '$dir/factory.yaml' --realm '$realm'"
+  eval "$ygg run --project '$project' --config '$dir/factory.yaml' --graph '$realm'"
 ) 2>&1 | tee "$out"
 rc="${PIPESTATUS[0]}"
 set -e
diff --git a/scripts/ygg-smoke-real.sh b/scripts/ygg-smoke-real.sh
index 9074ef4..14f3b67 100755
--- a/scripts/ygg-smoke-real.sh
+++ b/scripts/ygg-smoke-real.sh
@@ -113,7 +113,7 @@ echo "smoke-real: the caps in $work/factory.yaml:"
 echo "smoke-real: ygg doctor on that config"
 if ! eval "$ygg doctor --project '$project' --config '$work/factory.yaml'"; then fail "ygg doctor refused the config; nothing was spent"; fi
 
-run="$ygg run --project '$project' --config '$work/factory.yaml' --realm '$realm' --brief '$tasks/$task/instruction.md'"
+run="$ygg run --project '$project' --config '$work/factory.yaml' --graph '$realm' --brief '$tasks/$task/instruction.md'"
 if [ "$dry" -eq 1 ]; then
   [ "$build" -eq 0 ] || echo "smoke-real: would run: $ygg sandbox build --config '$work/factory.yaml' --realm '$realm'"
   echo "smoke-real: would run: timeout --signal=INT --kill-after=2m $wall $run"
diff --git a/scripts/ygg-smoke-realms.sh b/scripts/ygg-smoke-realms.sh
index 9a030ca..f5b280b 100755
--- a/scripts/ygg-smoke-realms.sh
+++ b/scripts/ygg-smoke-realms.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # Run the realms smoke run (v0-H13) with real agents, then print the evidence report.
-#   ygg-smoke-realms.sh [--build] [--folder DIR] [--env FILE] [--clip] [--realm NAME] [--brief FILE] [--tag TAG]
+#   ygg-smoke-realms.sh [--build] [--folder DIR] [--env FILE] [--clip] [--graph NAME|DIR] [--brief FILE] [--tag TAG]
 # The run builds a tiny product from two realm leaves (smoke-lead and smoke-api, in odin/testdata/smoke-realms):
 # real planners write the leaves file and the plan in scratch workspaces in sandboxes, Odin publishes them,
 # creates the leaves from their realms' templates, and a real implementer builds one task in each leaf.
@@ -14,27 +14,30 @@
 #   5. runs the realm and keeps its raw output in DIR/h13-run.txt (shown live as ygg prints it: do not paste
 #      that file, paste the report);
 #   6. prints the report of ygg-evidence.sh, with the credentials removed (also in DIR/h13-report.txt): paste it.
-# The same script runs the content smoke run (v0-H15) with --realm midgard-react --brief BRIEF --tag h15: the real
-# realms, scripted agents, the real check ladder. --realm is the lead realm (default smoke-lead), --brief the
+# The same script runs the content smoke run (v0-H15) with --graph software --brief BRIEF --tag h15: the real
+# realms, scripted agents, the real check ladder. --graph is the graph pack, a name or a folder (default: the
+# smoke-lead folder of odin/testdata/smoke-realms; a name needs a graphs section in factory.yaml), --brief the
 # brief the run is given, and --tag names the files of the run and its report in DIR (h13 by default).
 # Defaults: DIR=$HOME/ygg-it, FILE=$HOME/.config/ouroboric/factory.env. For tests and other machines: YGG_CMD
 # (how ygg runs), YGG_ODIN (the odin folder), YGG_BIND (the bind mount, default /mnt/wsl/ygg-bind) and
 # YGG_CLI_VERSION (default 0.89.0). The engine environment comes from ygg-engine.sh (YGG_ENGINE_CHECK=0 skips it).
 set -euo pipefail
 HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-dir="$HOME/ygg-it" envfile="$HOME/.config/ouroboric/factory.env" build=0 clip=() realm=smoke-lead brief="" tag=h13
+dir="$HOME/ygg-it" envfile="$HOME/.config/ouroboric/factory.env" build=0 clip=() graph="" brief="" tag=h13
 while [ $# -gt 0 ]; do
   case "$1" in
     --build) build=1; shift ;;
     --folder) dir="${2:?--folder needs a folder}"; shift 2 ;;
     --env) envfile="${2:?--env needs a file}"; shift 2 ;;
     --clip) clip=(--clip); shift ;;
-    --realm) realm="${2:?--realm needs a realm name}"; shift 2 ;;
+    --graph) graph="${2:?--graph needs a name or a folder}"; shift 2 ;;
     --brief) brief="${2:?--brief needs a file}"; shift 2 ;;
     --tag) tag="${2:?--tag needs a name}"; shift 2 ;;
-    *) echo "usage: ygg-smoke-realms.sh [--build] [--folder DIR] [--env FILE] [--clip] [--realm NAME] [--brief FILE] [--tag TAG]" >&2; exit 2 ;;
+    *) echo "usage: ygg-smoke-realms.sh [--build] [--folder DIR] [--env FILE] [--clip] [--graph NAME|DIR] [--brief FILE] [--tag TAG]" >&2; exit 2 ;;
   esac
 done
+odin="${YGG_ODIN:-$HERE/../../yggdrasil/odin}"
+[ -n "$graph" ] || graph="$odin/testdata/smoke-realms/smoke-lead"
 want="${YGG_CLI_VERSION:-0.89.0}" bind="${YGG_BIND:-/mnt/wsl/ygg-bind}"
 export PATH="$dir/dc/node_modules/.bin:$PATH"
 # The engine environment is ygg-engine.sh's: the engine of DIR/factory.yaml (never the shell's CONTAINER_HOST),
@@ -45,11 +48,13 @@ if [ "${YGG_ENGINE_CHECK:-1}" = 1 ]; then
 fi
 [ -f "$dir/factory.yaml" ] || { echo "smoke-realms: $dir/factory.yaml is missing; copy odin/testdata/smoke-realms/factory.example.yaml there and set the engine, the mount and realms.dir" >&2; exit 2; }
 [ -f "$envfile" ] || { echo "smoke-realms: the credentials file $envfile is missing" >&2; exit 2; }
-grep -q '^realms:' "$dir/factory.yaml" || { echo "smoke-realms: $dir/factory.yaml has no realms section: the run is given a realm by name ($realm), and realms.dir says where it is" >&2; exit 2; }
+grep -q '^realms:' "$dir/factory.yaml" || { echo "smoke-realms: $dir/factory.yaml has no realms section: realms.dir says where the leaf realms are" >&2; exit 2; }
+case "$graph" in */*) ;; *) grep -q '^graphs:' "$dir/factory.yaml" || { echo "smoke-realms: $dir/factory.yaml has no graphs section: the run is given a graph by name ($graph), and graphs.dir says where it is" >&2; exit 2; } ;; esac
 [ -z "$brief" ] || [ -f "$brief" ] || { echo "smoke-realms: the brief $brief is missing" >&2; exit 2; }
 got="$(devcontainer --version 2>/dev/null | head -n 1 || true)"
 [ "$got" = "$want" ] || { echo "smoke-realms: devcontainer CLI is '${got:-missing}', want $want; put the right one first on PATH" >&2; exit 2; }
 [ -d "$bind" ] || { echo "smoke-realms: the bind mount $bind is missing; a WSL restart removes it (see Phase 3 v0-H07)" >&2; exit 2; }
+mountpoint -q "$bind" || { echo "smoke-realms: the bind mount $bind is a folder with nothing mounted on it; run: sudo mount --bind <the host folder of factory.yaml's mount> $bind (a WSL restart removes it, see Phase 3 v0-H07)" >&2; exit 2; }
 
 project="$dir/smoke-realms-$(date +%Y%m%d-%H%M%S)"
 mkdir -p "$project"
@@ -61,7 +66,6 @@ echo "smoke-realms: made $project"
 
 ygg="${YGG_CMD:-}"
 if [ -z "$ygg" ]; then
-  odin="${YGG_ODIN:-$HERE/../../yggdrasil/odin}"
   if command -v ygg >/dev/null 2>&1; then ygg=ygg; else ygg="cd '$odin' && go run ./cmd/ygg"; fi
 fi
 out="$dir/$tag-run.txt"
@@ -73,7 +77,7 @@ set +e
   . "$envfile"
   set +a
   if [ "$build" -eq 1 ]; then eval "$ygg sandbox build --config '$dir/factory.yaml' --all"; fi
-  eval "$ygg run --project '$project' --config '$dir/factory.yaml' --realm '$realm' ${brief:+--brief '$brief'}"
+  eval "$ygg run --project '$project' --config '$dir/factory.yaml' --graph '$graph' ${brief:+--brief '$brief'}"
 ) 2>&1 | tee "$out"
 rc="${PIPESTATUS[0]}"
 set -e