diff --git a/scripts/agent-branch-start.sh b/scripts/agent-branch-start.sh
index 61ca938..24331fb 100755
--- a/scripts/agent-branch-start.sh
+++ b/scripts/agent-branch-start.sh
@@ -46,14 +46,33 @@ done
 
 sanitize_slug() {
   local raw="$1"
+  local fallback="${2:-task}"
   local slug
   slug="$(printf '%s' "$raw" | tr '[:upper:]' '[:lower:]' | sed -E 's/[^a-z0-9]+/-/g; s/^-+//; s/-+$//; s/-{2,}/-/g')"
   if [[ -z "$slug" ]]; then
-    slug="task"
+    slug="$fallback"
   fi
   printf '%s' "$slug"
 }
 
+resolve_active_codex_snapshot_name() {
+  local override="${MUSAFETY_CODEX_AUTH_SNAPSHOT:-}"
+  if [[ -n "$override" ]]; then
+    printf '%s' "$override"
+    return 0
+  fi
+
+  local codex_auth_bin="${MUSAFETY_CODEX_AUTH_BIN:-codex-auth}"
+  if ! command -v "$codex_auth_bin" >/dev/null 2>&1; then
+    return 0
+  fi
+
+  "$codex_auth_bin" list 2>/dev/null \
+    | sed -n 's/^[[:space:]]*\*[[:space:]]\+//p' \
+    | head -n 1 \
+    | tr -d '\r' || true
+}
+
 if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
   echo "[agent-branch-start] Not inside a git repository." >&2
   exit 1
@@ -72,10 +91,16 @@ else
   start_ref="${BASE_BRANCH}"
 fi
 
-task_slug="$(sanitize_slug "$TASK_NAME")"
-agent_slug="$(sanitize_slug "$AGENT_NAME")"
+task_slug="$(sanitize_slug "$TASK_NAME" "task")"
+agent_slug="$(sanitize_slug "$AGENT_NAME" "agent")"
+snapshot_name="$(resolve_active_codex_snapshot_name)"
+snapshot_slug="$(sanitize_slug "$snapshot_name" "")"
 timestamp="$(date +%Y%m%d-%H%M%S)"
-branch_name="agent/${agent_slug}/${timestamp}-${task_slug}"
+if [[ -n "$snapshot_slug" ]]; then
+  branch_name="agent/${agent_slug}/${timestamp}-${snapshot_slug}-${task_slug}"
+else
+  branch_name="agent/${agent_slug}/${timestamp}-${task_slug}"
+fi
 
 if git show-ref --verify --quiet "refs/heads/${branch_name}"; then
   echo "[agent-branch-start] Branch already exists: ${branch_name}" >&2
diff --git a/templates/scripts/agent-branch-start.sh b/templates/scripts/agent-branch-start.sh
index 2f5614c..2cb277e 100755
--- a/templates/scripts/agent-branch-start.sh
+++ b/templates/scripts/agent-branch-start.sh
@@ -75,14 +75,33 @@ fi
 
 sanitize_slug() {
   local raw="$1"
+  local fallback="${2:-task}"
   local slug
   slug="$(printf '%s' "$raw" | tr '[:upper:]' '[:lower:]' | sed -E 's/[^a-z0-9]+/-/g; s/^-+//; s/-+$//; s/-{2,}/-/g')"
   if [[ -z "$slug" ]]; then
-    slug="task"
+    slug="$fallback"
   fi
   printf '%s' "$slug"
 }
 
+resolve_active_codex_snapshot_name() {
+  local override="${MUSAFETY_CODEX_AUTH_SNAPSHOT:-}"
+  if [[ -n "$override" ]]; then
+    printf '%s' "$override"
+    return 0
+  fi
+
+  local codex_auth_bin="${MUSAFETY_CODEX_AUTH_BIN:-codex-auth}"
+  if ! command -v "$codex_auth_bin" >/dev/null 2>&1; then
+    return 0
+  fi
+
+  "$codex_auth_bin" list 2>/dev/null \
+    | sed -n 's/^[[:space:]]*\*[[:space:]]\+//p' \
+    | head -n 1 \
+    | tr -d '\r' || true
+}
+
 if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
   echo "[agent-branch-start] Not inside a git repository." >&2
   exit 1
@@ -101,10 +120,16 @@ else
   start_ref="${BASE_BRANCH}"
 fi
 
-task_slug="$(sanitize_slug "$TASK_NAME")"
-agent_slug="$(sanitize_slug "$AGENT_NAME")"
+task_slug="$(sanitize_slug "$TASK_NAME" "task")"
+agent_slug="$(sanitize_slug "$AGENT_NAME" "agent")"
+snapshot_name="$(resolve_active_codex_snapshot_name)"
+snapshot_slug="$(sanitize_slug "$snapshot_name" "")"
 timestamp="$(date +%Y%m%d-%H%M%S)"
-branch_name="agent/${agent_slug}/${timestamp}-${task_slug}"
+if [[ -n "$snapshot_slug" ]]; then
+  branch_name="agent/${agent_slug}/${timestamp}-${snapshot_slug}-${task_slug}"
+else
+  branch_name="agent/${agent_slug}/${timestamp}-${task_slug}"
+fi
 
 if git show-ref --verify --quiet "refs/heads/${branch_name}"; then
   echo "[agent-branch-start] Branch already exists: ${branch_name}" >&2
diff --git a/test/install.test.js b/test/install.test.js
index 6220a90..f9e492d 100644
--- a/test/install.test.js
+++ b/test/install.test.js
@@ -55,6 +55,14 @@ function createFakeScorecardScript(scriptBody) {
   return fakePath;
 }
 
+function createFakeCodexAuthScript(scriptBody) {
+  const fakeBin = fs.mkdtempSync(path.join(os.tmpdir(), 'musafety-fake-codex-auth-'));
+  const fakePath = path.join(fakeBin, 'codex-auth');
+  fs.writeFileSync(fakePath, `#!/usr/bin/env bash\nset -e\n${scriptBody}\n`, 'utf8');
+  fs.chmodSync(fakePath, 0o755);
+  return { fakeBin, fakePath };
+}
+
 function initRepo() {
   const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'musafety-'));
   const repoDir = path.join(tempDir, 'repo');
@@ -241,6 +249,50 @@ test('setup agent-branch-start requires --allow-in-place when using --in-place',
   assert.match(result.stderr, /--in-place --allow-in-place/);
 });
 
+test('setup agent-branch-start includes active codex snapshot slug in branch name', () => {
+  const repoDir = initRepo();
+
+  let result = runNode(['setup', '--target', repoDir], repoDir);
+  assert.equal(result.status, 0, result.stderr || result.stdout);
+  seedCommit(repoDir);
+
+  const { fakeBin } = createFakeCodexAuthScript(`
+if [[ "$1" != "list" ]]; then
+  exit 1
+fi
+cat <<'OUT'
+  default
+* Zeus Edix Hu
+OUT
+`);
+
+  result = runCmd(
+    'bash',
+    ['scripts/agent-branch-start.sh', 'restore-snapshot', 'planner', 'dev'],
+    repoDir,
+    { env: { PATH: `${fakeBin}:${process.env.PATH || ''}` } },
+  );
+  assert.equal(result.status, 0, result.stderr || result.stdout);
+  assert.match(result.stdout, /Created branch: agent\/planner\/\d{8}-\d{6}-zeus-edix-hu-restore-snapshot/);
+});
+
+test('setup agent-branch-start supports explicit snapshot override without codex-auth', () => {
+  const repoDir = initRepo();
+
+  let result = runNode(['setup', '--target', repoDir], repoDir);
+  assert.equal(result.status, 0, result.stderr || result.stdout);
+  seedCommit(repoDir);
+
+  result = runCmd(
+    'bash',
+    ['scripts/agent-branch-start.sh', 'ship-fix', 'bot', 'dev'],
+    repoDir,
+    { env: { MUSAFETY_CODEX_AUTH_SNAPSHOT: 'Prod Snapshot One' } },
+  );
+  assert.equal(result.status, 0, result.stderr || result.stdout);
+  assert.match(result.stdout, /Created branch: agent\/bot\/\d{8}-\d{6}-prod-snapshot-one-ship-fix/);
+});
+
 test('default invocation runs non-mutating status output', () => {
   const repoDir = initRepo();