diff --git a/internal/provision/devcontainer/go/install.go b/internal/provision/devcontainer/go/install.go
index 94a7cdc..fd6ab73 100644
--- a/internal/provision/devcontainer/go/install.go
+++ b/internal/provision/devcontainer/go/install.go
@@ -17,6 +17,9 @@ func Install(cfg state.Config) error {
 
 	if err := executil.RunEmbeddedScript(
 		"devcontainer/go/install.sh",
+		"RUNTIME=go",
+		"ARCHIVE_EXT=tar.gz",
+		"RUNTIME_VERSION="+cfg.Version,
 	); err != nil {
 		return fmt.Errorf("go devcontainer install failed: %w", err)
 	}
diff --git a/internal/provision/devcontainer/java/install.go b/internal/provision/devcontainer/java/install.go
index abd3b37..81f1a41 100644
--- a/internal/provision/devcontainer/java/install.go
+++ b/internal/provision/devcontainer/java/install.go
@@ -17,6 +17,9 @@ func Install(cfg state.Config) error {
 
 	if err := executil.RunEmbeddedScript(
 		"devcontainer/java/install.sh",
+		"RUNTIME=java",
+		"ARCHIVE_EXT=tar.gz",
+		"RUNTIME_VERSION="+cfg.Version,
 	); err != nil {
 		return fmt.Errorf("java devcontainer install failed: %w", err)
 	}
diff --git a/internal/provision/devcontainer/node/install.go b/internal/provision/devcontainer/node/install.go
index a6d34c2..fa410d2 100644
--- a/internal/provision/devcontainer/node/install.go
+++ b/internal/provision/devcontainer/node/install.go
@@ -15,9 +15,11 @@ func Install(cfg state.Config) error {
 		return nil
 	}
 
-	// Execute embedded installer (mirrors game server model)
 	if err := executil.RunEmbeddedScript(
 		"devcontainer/node/install.sh",
+		"RUNTIME=node",
+		"ARCHIVE_EXT=tar.xz",
+		"RUNTIME_VERSION="+cfg.Version,
 	); err != nil {
 		return fmt.Errorf("node devcontainer install failed: %w", err)
 	}
diff --git a/internal/provision/devcontainer/python/install.go b/internal/provision/devcontainer/python/install.go
index fe5a9ad..bed2e56 100644
--- a/internal/provision/devcontainer/python/install.go
+++ b/internal/provision/devcontainer/python/install.go
@@ -17,6 +17,9 @@ func Install(cfg state.Config) error {
 
 	if err := executil.RunEmbeddedScript(
 		"devcontainer/python/install.sh",
+		"RUNTIME=python",
+		"ARCHIVE_EXT=tar.xz",
+		"RUNTIME_VERSION="+cfg.Version,
 	); err != nil {
 		return fmt.Errorf("python devcontainer install failed: %w", err)
 	}
diff --git a/internal/provision/executil/embedded_exec.go b/internal/provision/executil/embedded_exec.go
index f19768d..a1a7bc2 100644
--- a/internal/provision/executil/embedded_exec.go
+++ b/internal/provision/executil/embedded_exec.go
@@ -5,22 +5,30 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+	"path"
 	"strings"
 
 	"zlh-agent/scripts"
 )
 
 // RunEmbeddedScript executes an embedded script via bash by piping its contents to stdin.
-// This mirrors RunScript's stdout/stderr behavior without requiring any files on disk.
-func RunEmbeddedScript(path string) error {
-	normalized := normalizeEmbeddedPath(path)
-	data, err := scripts.FS.ReadFile(normalized)
+// If the script is a devcontainer installer, this automatically prepends the shared common.sh
+// so that tiny per-runtime installers can call install_runtime in the same shell session.
+func RunEmbeddedScript(scriptPath string, extraEnv ...string) error {
+	normalized := normalizeEmbeddedPath(scriptPath)
+
+	payload, err := loadEmbeddedPayload(normalized)
 	if err != nil {
-		return fmt.Errorf("embedded script not found: %s", path)
+		return err
 	}
 
 	cmd := exec.Command("bash")
-	cmd.Stdin = bytes.NewReader(data)
+	cmd.Stdin = bytes.NewReader(payload)
+
+	// Inherit current env and overlay any provided vars (e.g., RUNTIME_VERSION=24).
+	if len(extraEnv) > 0 {
+		cmd.Env = append(os.Environ(), extraEnv...)
+	}
 
 	// Match RunScript behavior (executil.go)
 	cmd.Stdout = os.Stdout
@@ -29,6 +37,33 @@ func RunEmbeddedScript(path string) error {
 	return cmd.Run()
 }
 
-func normalizeEmbeddedPath(path string) string {
-	return strings.TrimPrefix(path, "scripts/")
+func loadEmbeddedPayload(normalized string) ([]byte, error) {
+	// If this is a devcontainer installer, prepend the shared library.
+	if strings.HasPrefix(normalized, "devcontainer/") {
+		commonPath := "devcontainer/lib/common.sh"
+		common, err := scripts.FS.ReadFile(commonPath)
+		if err != nil {
+			return nil, fmt.Errorf("embedded script missing: %s: %w", commonPath, err)
+		}
+
+		body, err := scripts.FS.ReadFile(normalized)
+		if err != nil {
+			return nil, fmt.Errorf("embedded script missing: %s: %w", normalized, err)
+		}
+
+		// Ensure bash sees common first, then runtime installer.
+		return append(append(common, '\n'), body...), nil
+	}
+
+	data, err := scripts.FS.ReadFile(normalized)
+	if err != nil {
+		return nil, fmt.Errorf("embedded script missing: %s: %w", normalized, err)
+	}
+	return data, nil
+}
+
+func normalizeEmbeddedPath(p string) string {
+	p = strings.TrimPrefix(p, "scripts/")
+	p = path.Clean(p)
+	return strings.TrimPrefix(p, "/")
 }
diff --git a/logs/agent.log b/logs/agent.log
new file mode 100644
index 0000000..e69de29
diff --git a/scripts/devcontainer/go/install.sh b/scripts/devcontainer/go/install.sh
index d80e368..5a33ba5 100644
--- a/scripts/devcontainer/go/install.sh
+++ b/scripts/devcontainer/go/install.sh
@@ -1,27 +1,5 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
 RUNTIME="go"
-ARCHIVE_FILE="go-${DEST_VERSION}.tar.gz"
+ARCHIVE_EXT="tar.gz"
+ARCHIVE_PREFIX="go"
 
-
-ARTIFACT_BASE_URL="${ZLH_ARTIFACT_BASE_URL:-http://10.60.0.251:8080}"
-DEST_DIR="${RUNTIME_ROOT}/${DEST_VERSION}"
-ARCHIVE_FILE="go-${DEST_VERSION}.tar.gz"
-URL="${ARTIFACT_BASE_URL%/}/devcontainer/go/${DEST_VERSION}/${ARCHIVE_FILE}"
-
-mkdir -p "${RUNTIME_ROOT}"
-
-if [ ! -d "${DEST_DIR}" ]; then
-  curl -fL "${URL}" -o /tmp/${ARCHIVE_FILE}
-  mkdir -p "${DEST_DIR}"
-  tar -xf /tmp/${ARCHIVE_FILE} -C "${DEST_DIR}" --strip-components=1
-fi
-
-ln -sfn "${DEST_DIR}" "${RUNTIME_ROOT}/current"
-ln -sfn "${DEST_DIR}/bin" "${RUNTIME_ROOT}/bin"
-
-cat >/etc/profile.d/zlh-go.sh <<'EOF'
-export PATH="/opt/zlh/runtime/go/bin:$PATH"
-EOF
-chmod +x /etc/profile.d/zlh-go.sh
+install_runtime
diff --git a/scripts/devcontainer/java/install.sh b/scripts/devcontainer/java/install.sh
index 74e0f4c..87a6428 100644
--- a/scripts/devcontainer/java/install.sh
+++ b/scripts/devcontainer/java/install.sh
@@ -1,26 +1,5 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
 RUNTIME="java"
-ARCHIVE_FILE="jdk-${DEST_VERSION}.tar.gz"
+ARCHIVE_EXT="tar.gz"
+ARCHIVE_PREFIX="jdk"
 
-ARTIFACT_BASE_URL="${ZLH_ARTIFACT_BASE_URL:-http://10.60.0.251:8080}"
-DEST_DIR="${RUNTIME_ROOT}/${DEST_VERSION}"
-ARCHIVE_FILE="jdk-${DEST_VERSION}.tar.gz"
-URL="${ARTIFACT_BASE_URL%/}/devcontainer/java/${DEST_VERSION}/${ARCHIVE_FILE}"
-
-mkdir -p "${RUNTIME_ROOT}"
-
-if [ ! -d "${DEST_DIR}" ]; then
-  curl -fL "${URL}" -o /tmp/${ARCHIVE_FILE}
-  mkdir -p "${DEST_DIR}"
-  tar -xf /tmp/${ARCHIVE_FILE} -C "${DEST_DIR}" --strip-components=1
-fi
-
-ln -sfn "${DEST_DIR}" "${RUNTIME_ROOT}/current"
-ln -sfn "${DEST_DIR}/bin" "${RUNTIME_ROOT}/bin"
-
-cat >/etc/profile.d/zlh-java.sh <<'EOF'
-export PATH="/opt/zlh/runtime/java/bin:$PATH"
-EOF
-chmod +x /etc/profile.d/zlh-java.sh
+install_runtime
diff --git a/scripts/devcontainer/lib/common.sh b/scripts/devcontainer/lib/common.sh
new file mode 100644
index 0000000..ff8a132
--- /dev/null
+++ b/scripts/devcontainer/lib/common.sh
@@ -0,0 +1,88 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+: "${RUNTIME:?RUNTIME required}"
+: "${RUNTIME_VERSION:?RUNTIME_VERSION required}"
+: "${ARCHIVE_EXT:?ARCHIVE_EXT required}"
+
+ZLH_ARTIFACT_BASE_URL="${ZLH_ARTIFACT_BASE_URL:-http://10.60.0.251:8080}"
+ZLH_RUNTIME_ROOT="${ZLH_RUNTIME_ROOT:-/opt/zlh/runtime}"
+ARCHIVE_PREFIX="${ARCHIVE_PREFIX:-${RUNTIME}}"
+
+RUNTIME_ROOT="${ZLH_RUNTIME_ROOT}/${RUNTIME}"
+DEST_DIR="${RUNTIME_ROOT}/${RUNTIME_VERSION}"
+CURRENT_LINK="${RUNTIME_ROOT}/current"
+
+log() { echo "[zlh-installer:${RUNTIME}] $*"; }
+fail() { echo "[zlh-installer:${RUNTIME}] ERROR: $*" >&2; exit 1; }
+
+artifact_name() {
+  echo "${ARCHIVE_PREFIX}-${RUNTIME_VERSION}.${ARCHIVE_EXT}"
+}
+
+artifact_url() {
+  echo "${ZLH_ARTIFACT_BASE_URL%/}/devcontainer/${RUNTIME}/${RUNTIME_VERSION}/$(artifact_name)"
+}
+
+download_artifact() {
+  local url out
+  url="$(artifact_url)"
+  out="/tmp/$(artifact_name)"
+
+  log "Downloading ${url}"
+  if command -v curl >/dev/null 2>&1; then
+    curl -fL "${url}" -o "${out}"
+  elif command -v wget >/dev/null 2>&1; then
+    wget -O "${out}" "${url}"
+  else
+    fail "curl or wget is required"
+  fi
+}
+
+extract_artifact() {
+  local out
+  out="/tmp/$(artifact_name)"
+
+  log "Extracting to ${DEST_DIR}"
+  mkdir -p "${DEST_DIR}"
+
+  case "${ARCHIVE_EXT}" in
+    tar.xz|tar.gz)
+      tar -xf "${out}" -C "${DEST_DIR}" --strip-components=1
+      ;;
+    *)
+      fail "Unsupported archive type: ${ARCHIVE_EXT}"
+      ;;
+  esac
+}
+
+update_symlinks() {
+  ln -sfn "${DEST_DIR}" "${CURRENT_LINK}"
+  ln -sfn "${CURRENT_LINK}/bin" "${RUNTIME_ROOT}/bin"
+}
+
+write_profile() {
+  cat >/etc/profile.d/zlh-${RUNTIME}.sh <<EOF
+export PATH="${RUNTIME_ROOT}/bin:\$PATH"
+EOF
+  chmod +x /etc/profile.d/zlh-${RUNTIME}.sh
+}
+
+install_runtime() {
+  log "Installing ${RUNTIME} ${RUNTIME_VERSION}"
+
+  mkdir -p "${RUNTIME_ROOT}"
+
+  if [[ -d "${DEST_DIR}" ]]; then
+    log "Version already installed at ${DEST_DIR}"
+  else
+    download_artifact
+    extract_artifact
+  fi
+
+  update_symlinks
+  write_profile
+  chmod -R 755 "${DEST_DIR}"
+
+  log "Install complete"
+}
diff --git a/scripts/devcontainer/node/install.sh b/scripts/devcontainer/node/install.sh
index 5a3aae6..1983018 100644
--- a/scripts/devcontainer/node/install.sh
+++ b/scripts/devcontainer/node/install.sh
@@ -1,33 +1,5 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
 RUNTIME="node"
-RUNTIME_ROOT="/opt/zlh/runtime/${RUNTIME}"
-DEST_VERSION="${RUNTIME_VERSION:?RUNTIME_VERSION required}"
+ARCHIVE_EXT="tar.xz"
+ARCHIVE_PREFIX="node"
 
-ARTIFACT_BASE_URL="${ZLH_ARTIFACT_BASE_URL:-http://10.60.0.251:8080}"
-ARCHIVE_FILE="${RUNTIME}-${DEST_VERSION}.tar.xz"
-URL="${ARTIFACT_BASE_URL%/}/devcontainer/${RUNTIME}/${DEST_VERSION}/${ARCHIVE_FILE}"
-
-
-DEST_DIR="${RUNTIME_ROOT}/${DEST_VERSION}"
-
-echo "[${RUNTIME}] Installing ${RUNTIME} ${DEST_VERSION}"
-
-mkdir -p "${RUNTIME_ROOT}"
-
-if [ ! -d "${DEST_DIR}" ]; then
-  curl -fL "${URL}" -o /tmp/${ARCHIVE_FILE}
-  mkdir -p "${DEST_DIR}"
-  tar -xf /tmp/${ARCHIVE_FILE} -C "${DEST_DIR}" --strip-components=1
-fi
-
-ln -sfn "${DEST_DIR}" "${RUNTIME_ROOT}/current"
-ln -sfn "${DEST_DIR}/bin" "${RUNTIME_ROOT}/bin"
-
-cat >/etc/profile.d/zlh-${RUNTIME}.sh <<EOF
-export PATH="/opt/zlh/runtime/${RUNTIME}/bin:\$PATH"
-EOF
-chmod +x /etc/profile.d/zlh-${RUNTIME}.sh
-
-chmod -R 755 "${DEST_DIR}"
+install_runtime
diff --git a/scripts/devcontainer/python/install.sh b/scripts/devcontainer/python/install.sh
index 05462d2..9dea7a5 100644
--- a/scripts/devcontainer/python/install.sh
+++ b/scripts/devcontainer/python/install.sh
@@ -1,55 +1,5 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
 RUNTIME="python"
-ARCHIVE_FILE="python-${DEST_VERSION}.tar.xz"
+ARCHIVE_EXT="tar.xz"
+ARCHIVE_PREFIX="python"
 
-
-ARTIFACT_BASE_URL="${ZLH_ARTIFACT_BASE_URL:-http://10.60.0.251:8080}"
-
-DEST_DIR="${RUNTIME_ROOT}/${DEST_VERSION}"
-TMP_DIR="/tmp/zlh-python-install"
-ARCHIVE_FILE="python-${DEST_VERSION}.tar.xz"
-URL="${ARTIFACT_BASE_URL%/}/devcontainer/python/${DEST_VERSION}/${ARCHIVE_FILE}"
-
-echo "[python] Installing Python ${DEST_VERSION}"
-
-mkdir -p "${RUNTIME_ROOT}"
-
-# Idempotency
-if [ -d "${DEST_DIR}" ]; then
-  echo "[python] Python ${DEST_VERSION} already installed at ${DEST_DIR}"
-else
-  echo "[python] Downloading ${URL}"
-  rm -rf "${TMP_DIR}"
-  mkdir -p "${TMP_DIR}"
-
-  if command -v curl >/dev/null 2>&1; then
-    curl -fL "${URL}" -o "${TMP_DIR}/${ARCHIVE_FILE}"
-  elif command -v wget >/dev/null 2>&1; then
-    wget -O "${TMP_DIR}/${ARCHIVE_FILE}" "${URL}"
-  else
-    echo "[python][ERROR] curl or wget is required"
-    exit 1
-  fi
-
-  echo "[python] Extracting ${ARCHIVE_FILE} -> ${DEST_DIR}"
-  mkdir -p "${DEST_DIR}"
-  tar -xf "${TMP_DIR}/${ARCHIVE_FILE}" -C "${DEST_DIR}" --strip-components=1
-fi
-
-# Stable symlinks (same model as Node)
-ln -sfn "${DEST_DIR}" "${RUNTIME_ROOT}/current"
-ln -sfn "${DEST_DIR}/bin" "${RUNTIME_ROOT}/bin"
-
-# System-wide PATH export
-cat >/etc/profile.d/zlh-python.sh <<'EOF'
-export PATH="/opt/zlh/runtime/python/bin:$PATH"
-EOF
-
-chmod +x /etc/profile.d/zlh-python.sh
-
-# Permissions sanity
-chmod -R 755 "${DEST_DIR}"
-
-echo "[python] Python ${DEST_VERSION} installed successfully"
+install_runtime
diff --git a/zlh-agent b/zlh-agent
index dbb3a77..07e39d3 100755
Binary files a/zlh-agent and b/zlh-agent differ