diff --git a/scripts/test_graph_index_append.sh b/scripts/test_graph_index_append.sh
new file mode 100755
index 0000000..16004fd
--- /dev/null
+++ b/scripts/test_graph_index_append.sh
@@ -0,0 +1,82 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+TMPDIR="${TMPDIR:-/tmp}"
+mkdir -p "${TMPDIR}"
+
+# shellcheck source=/dev/null
+source "${ROOT_DIR}/scripts/graph_client_helpers.sh"
+graph_helpers_init "${ROOT_DIR}"
+
+AMDUATD_BIN="${ROOT_DIR}/build/amduatd"
+ASL_BIN="${ROOT_DIR}/vendor/amduat/build/amduat-asl"
+if [[ ! -x "${AMDUATD_BIN}" || ! -x "${ASL_BIN}" ]]; then
+  echo "missing binaries; build amduatd and amduat-asl first" >&2
+  exit 1
+fi
+
+tmp_root="$(mktemp -d -p "${TMPDIR}" amduatd-graph-index-XXXXXX)"
+root="${tmp_root}/root"
+sock="${tmp_root}/amduatd.sock"
+space_id="graphindex"
+log_file="${tmp_root}/amduatd.log"
+
+cleanup() {
+  if [[ -n "${pid:-}" ]]; then
+    kill "${pid}" >/dev/null 2>&1 || true
+    wait "${pid}" >/dev/null 2>&1 || true
+  fi
+  rm -rf "${tmp_root}"
+}
+trap cleanup EXIT
+
+mkdir -p "${root}"
+"${ASL_BIN}" index init --root "${root}" >/dev/null
+
+"${AMDUATD_BIN}" --root "${root}" --sock "${sock}" --store-backend index --space "${space_id}" \
+  >"${log_file}" 2>&1 &
+pid=$!
+
+ready_rc=0
+graph_wait_for_ready "${sock}" "${pid}" "${log_file}" || ready_rc=$?
+if [[ ${ready_rc} -eq 77 ]]; then
+  exit 77
+fi
+if [[ ${ready_rc} -ne 0 ]]; then
+  echo "daemon not ready" >&2
+  exit 1
+fi
+
+node_a="$(
+  graph_http_post "${sock}" "/v2/graph/nodes" '{"name":"idx-a"}' \
+    --header "Content-Type: application/json" \
+    --header "X-Amduat-Space: ${space_id}"
+)"
+echo "${node_a}" | grep -q '"name":"idx-a"' || {
+  echo "first node create failed: ${node_a}" >&2
+  exit 1
+}
+
+node_b="$(
+  graph_http_post "${sock}" "/v2/graph/nodes" '{"name":"idx-b"}' \
+    --header "Content-Type: application/json" \
+    --header "X-Amduat-Space: ${space_id}"
+)"
+echo "${node_b}" | grep -q '"name":"idx-b"' || {
+  echo "second node create failed: ${node_b}" >&2
+  exit 1
+}
+
+edge="$(
+  graph_http_post "${sock}" "/v2/graph/edges" \
+    '{"subject":"idx-a","predicate":"ms.within_domain","object":"idx-b"}' \
+    --header "Content-Type: application/json" \
+    --header "X-Amduat-Space: ${space_id}"
+)"
+echo "${edge}" | grep -q '"edge_ref":"' || {
+  echo "edge create failed: ${edge}" >&2
+  exit 1
+}
+
+echo "ok: index append sequence passed"
diff --git a/scripts/test_graph_index_append_stress.sh b/scripts/test_graph_index_append_stress.sh
new file mode 100755
index 0000000..5d50cd5
--- /dev/null
+++ b/scripts/test_graph_index_append_stress.sh
@@ -0,0 +1,114 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+TMPDIR="${TMPDIR:-/tmp}"
+mkdir -p "${TMPDIR}"
+
+# shellcheck source=/dev/null
+source "${ROOT_DIR}/scripts/graph_client_helpers.sh"
+graph_helpers_init "${ROOT_DIR}"
+
+AMDUATD_BIN="${ROOT_DIR}/build/amduatd"
+ASL_BIN="${ROOT_DIR}/vendor/amduat/build/amduat-asl"
+if [[ ! -x "${AMDUATD_BIN}" || ! -x "${ASL_BIN}" ]]; then
+  echo "missing binaries; build amduatd and amduat-asl first" >&2
+  exit 1
+fi
+
+iters="${AMDUATD_INDEX_STRESS_ITERS:-20}"
+case "${iters}" in
+  ''|*[!0-9]*)
+    echo "invalid AMDUATD_INDEX_STRESS_ITERS: ${iters}" >&2
+    exit 2
+    ;;
+esac
+if [[ "${iters}" -le 0 ]]; then
+  echo "AMDUATD_INDEX_STRESS_ITERS must be > 0" >&2
+  exit 2
+fi
+
+run_one() {
+  local i="$1"
+  local tmp_root root sock space_id log_file pid ready_rc
+
+  tmp_root="$(mktemp -d -p "${TMPDIR}" amduatd-graph-index-stress-XXXXXX)"
+  root="${tmp_root}/root"
+  sock="${tmp_root}/amduatd.sock"
+  space_id="graphindex${i}"
+  log_file="${tmp_root}/amduatd.log"
+  pid=""
+
+  cleanup_one() {
+    if [[ -n "${pid}" ]]; then
+      kill "${pid}" >/dev/null 2>&1 || true
+      wait "${pid}" >/dev/null 2>&1 || true
+    fi
+    rm -rf "${tmp_root}"
+  }
+  trap cleanup_one RETURN
+
+  mkdir -p "${root}"
+  "${ASL_BIN}" index init --root "${root}" >/dev/null
+
+  "${AMDUATD_BIN}" --root "${root}" --sock "${sock}" --store-backend index --space "${space_id}" \
+    >"${log_file}" 2>&1 &
+  pid=$!
+
+  ready_rc=0
+  graph_wait_for_ready "${sock}" "${pid}" "${log_file}" || ready_rc=$?
+  if [[ ${ready_rc} -eq 77 ]]; then
+    return 77
+  fi
+  if [[ ${ready_rc} -ne 0 ]]; then
+    echo "iteration ${i}: daemon not ready" >&2
+    return 1
+  fi
+
+  node_a="$(
+    graph_http_post "${sock}" "/v2/graph/nodes" '{"name":"idx-a"}' \
+      --header "Content-Type: application/json" \
+      --header "X-Amduat-Space: ${space_id}"
+  )"
+  echo "${node_a}" | grep -q '"name":"idx-a"' || {
+    echo "iteration ${i}: first node create failed: ${node_a}" >&2
+    return 1
+  }
+
+  node_b="$(
+    graph_http_post "${sock}" "/v2/graph/nodes" '{"name":"idx-b"}' \
+      --header "Content-Type: application/json" \
+      --header "X-Amduat-Space: ${space_id}"
+  )"
+  echo "${node_b}" | grep -q '"name":"idx-b"' || {
+    echo "iteration ${i}: second node create failed: ${node_b}" >&2
+    return 1
+  }
+
+  edge="$(
+    graph_http_post "${sock}" "/v2/graph/edges" \
+      '{"subject":"idx-a","predicate":"ms.within_domain","object":"idx-b"}' \
+      --header "Content-Type: application/json" \
+      --header "X-Amduat-Space: ${space_id}"
+  )"
+  echo "${edge}" | grep -q '"edge_ref":"' || {
+    echo "iteration ${i}: edge create failed: ${edge}" >&2
+    return 1
+  }
+
+  echo "iteration ${i}/${iters}: ok"
+  return 0
+}
+
+for i in $(seq 1 "${iters}"); do
+  rc=0
+  run_one "${i}" || rc=$?
+  if [[ ${rc} -eq 77 ]]; then
+    exit 77
+  fi
+  if [[ ${rc} -ne 0 ]]; then
+    exit "${rc}"
+  fi
+done
+
+echo "ok: index append stress passed (${iters} iterations)"