diff --git a/AGENTS.md b/AGENTS.md
index c7babb5..4618d91 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -160,6 +160,10 @@ for a full audit or `--fast` for pre-commit speed. Bypass with `--no-verify`
   The Crush hook (`hooks/ticket-gate.sh`) blocks modifying operations
   until this file exists. If no ticket exists, CREATE ONE FIRST via
   redmine-cli, then set it. Clear when done: `> .crush/active-ticket`.
+  **Parallel sessions:** each session uses its OWN suffixed file (e.g.
+  `.crush/active-ticket-plant`, `.crush/active-ticket-core`) so concurrent
+  sessions never clobber each other's ticket; any non-empty
+  `.crush/active-ticket*` satisfies the gate.
 - **WORKING.md** is the only in-repo task tracker — a scratchpad for the current
   session. The pre-commit hook blocks commits while any task remains unchecked.
 - **Parallel sessions:** when two sessions share this repo (e.g. physical plant
diff --git a/hooks/ticket-gate.sh b/hooks/ticket-gate.sh
index 6a09fa9..582f335 100755
--- a/hooks/ticket-gate.sh
+++ b/hooks/ticket-gate.sh
@@ -9,7 +9,6 @@
 # run audits, check status, etc.).
 set -euo pipefail
 
-TICKET_FILE="${CRUSH_PROJECT_DIR}/.crush/active-ticket"
 TOOL="${CRUSH_TOOL_NAME:-}"
 CMD="${CRUSH_TOOL_INPUT_COMMAND:-}"
 
@@ -54,12 +53,18 @@ case "$FILE_PATH" in
     ;;
 esac
 
-# Check for active ticket
-if [ -f "$TICKET_FILE" ] && [ -s "$TICKET_FILE" ]; then
-  TICKET=$(cat "$TICKET_FILE")
-  printf '{"context":"Active ticket: %s"}\n' "$TICKET"
-  exit 0
-fi
+# Check for active ticket. Parallel sessions each use their OWN file:
+#   .crush/active-ticket           (default / single session)
+#   .crush/active-ticket-<name>    (suffixed per session; any non-empty one
+#                                   satisfies the gate — sessions never fight
+#                                   over one file)
+GATE_OK=0
+for f in "$CRUSH_PROJECT_DIR"/.crush/active-ticket*; do
+  [ -f "$f" ] && [ -s "$f" ] || continue
+  GATE_OK=1
+  printf '{"context":"Active ticket(s): %s -> %s"}\n' "$(basename "$f")" "$(cat "$f")"
+done
+[ "$GATE_OK" -eq 1 ] && exit 0
 
 # No active ticket — block
 cat >&2 <<'MSG'
diff --git a/scripts/check-rules.sh b/scripts/check-rules.sh
index 57336c5..d863be6 100755
--- a/scripts/check-rules.sh
+++ b/scripts/check-rules.sh
@@ -41,7 +41,7 @@ TODAY="$(date +%Y-%m-%d)"
 #    Runs in Docker so the host stays clean (no native shellcheck required).
 # ----------------------------------------------------------------------------
 $RULE_VERBOSE && log_step "Shell scripts (shellcheck)"
-mapfile -d '' SH_FILES < <(find . -path ./.git -prune -o -path ./.tmp -prune -o -path ./vendor -prune -o -path ./archive -prune -o -path ./node_modules -prune -o \( -name '*.sh' -o -name '*.bash' \) -print0 2>/dev/null)
+mapfile -d '' SH_FILES < <(find . -path ./.git -prune -o -path ./.tmp -prune -o -path ./.crush -prune -o -path ./vendor -prune -o -path ./archive -prune -o -path ./node_modules -prune -o \( -name '*.sh' -o -name '*.bash' \) -print0 2>/dev/null)
 if [ "${#SH_FILES[@]}" -gt 0 ]; then
     if have shellcheck; then
         if shellcheck "${SH_FILES[@]}" >/dev/null 2>&1; then
diff --git a/tests/shellcheck.sh b/tests/shellcheck.sh
index e3105f9..0876839 100644
--- a/tests/shellcheck.sh
+++ b/tests/shellcheck.sh
@@ -36,7 +36,8 @@ mapfile -t FILES < <(
         *) echo "$f_abs" ;;
       esac
     done < <(find "$ROOT" -type f -name '*.sh' \
-               -not -path '*/.git/*' -not -path "$ROOT/vendor/*")
+               -not -path '*/.git/*' -not -path "$ROOT/vendor/*" \
+               -not -path "$ROOT/.crush/*")
   fi
 )