diff --git a/agent/agent_init.py b/agent/agent_init.py
index f514877cf0..06bd3f1a07 100644
--- a/agent/agent_init.py
+++ b/agent/agent_init.py
@@ -15,7 +15,6 @@ import re
 import sys
 import threading
 import time
-import uuid
 from collections import deque
 from contextlib import suppress
 from datetime import datetime
@@ -41,6 +40,7 @@ from hermes_cli.config import cfg_get
 from hermes_cli.route_identity import normalize_route_base_url
 from hermes_cli.timeouts import get_provider_request_timeout
 from hermes_constants import get_hermes_home
+from hermes_state_ids import new_session_id
 from utils import base_url_host_matches, is_truthy_value
 
 # Same logger name as run_agent so caplog/patches on "run_agent" see our records.
@@ -1122,9 +1122,7 @@ def _publish_session_id(session_id: str) -> None:
 def _init_session_state(agent, session_id, session_db, parent_session_id, reasoning_config, max_tokens,
     checkpoints_enabled, checkpoint_max_snapshots, checkpoint_max_total_size_mb, checkpoint_max_file_size_mb):
     agent.session_start = datetime.now()
-    agent.session_id = session_id or (
-        f"{agent.session_start.strftime('%Y%m%d_%H%M%S')}_{uuid.uuid4().hex[:6]}"
-    )
+    agent.session_id = session_id or new_session_id(agent.session_start)
     _publish_session_id(agent.session_id)
 
     # ~/.hermes/sessions/ — kept unconditionally for request_dump_*.json debug breadcrumbs.
diff --git a/agent/conversation_compression.py b/agent/conversation_compression.py
index 1f49aa9060..3bf4a23238 100644
--- a/agent/conversation_compression.py
+++ b/agent/conversation_compression.py
@@ -33,6 +33,7 @@ from agent.memory_provider import PRE_COMPRESS_CHECKPOINT_API_VERSION
 from agent.model_metadata import estimate_messages_tokens_rough, estimate_request_tokens_rough
 from agent.session_activity import ActivityProvenance, normalize_activity_provenance
 from agent.usage_anchor import set_usage_anchor
+from hermes_state_ids import new_session_id as mint_session_id
 
 logger = logging.getLogger(__name__)
 
@@ -2980,7 +2981,7 @@ def _publish_rotated_compaction(
     if _profile_for_child == "default":
         _profile_for_child = None
     old_title = agent._session_db.get_session_title(agent.session_id)
-    new_session_id = f"{datetime.now().strftime('%Y%m%d_%H%M%S')}_{uuid.uuid4().hex[:6]}"
+    new_session_id = mint_session_id()
     from agent.context_compressor import _DB_PERSISTED_MARKER
     agent._session_db.publish_compression_child(
         parent_session_id=old_session_id, child_session_id=new_session_id,
diff --git a/cli.py b/cli.py
index 389a1472b0..86980375fc 100644
--- a/cli.py
+++ b/cli.py
@@ -17,7 +17,6 @@ import re
 import atexit
 import errno
 import time
-import uuid
 import textwrap
 from collections import deque
 from dataclasses import dataclass
@@ -170,6 +169,7 @@ _COMMAND_SPINNER_FRAMES = ("⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧
 
 # ~/.hermes/.env first, project .env as dev fallback; user env files override stale shell exports.
 from hermes_constants import get_hermes_home
+from hermes_state_ids import new_session_id
 from hermes_cli.env_loader import load_hermes_dotenv
 from utils import base_url_host_matches, base_url_hostname, fast_safe_load
 
@@ -2827,7 +2827,7 @@ class HermesCLI(CLIProcessNotificationsMixin, CLIAgentSetupMixin, CLICommandsMix
         self._init_session_store()
         self._pending_title: Optional[str] = None
         self._resumed = bool(resume)
-        self.session_id = resume or f"{self.session_start.strftime('%Y%m%d_%H%M%S')}_{uuid.uuid4().hex[:6]}"
+        self.session_id = resume or new_session_id(self.session_start)
         getattr(self, "_write_terminal_breadcrumb", lambda: None)()
 
         self._history_file = _hermes_home / ".hermes_history"
diff --git a/gateway/platforms/base.py b/gateway/platforms/base.py
index df8e736189..23337e02f9 100644
--- a/gateway/platforms/base.py
+++ b/gateway/platforms/base.py
@@ -2240,11 +2240,14 @@ class BasePlatformAdapter(ABC):
 
     def _event_session_key(self, event: "MessageEvent") -> str:
         """Adapter-level session key for ``event``, profile-namespaced like the agent run."""
+        return self._source_session_key(event.source)
+
+    def _source_session_key(self, source: "SessionSource") -> str:
         extra = self.config.extra
         return build_session_key(
-            event.source, group_sessions_per_user=extra.get("group_sessions_per_user", True),
+            source, group_sessions_per_user=extra.get("group_sessions_per_user", True),
             thread_sessions_per_user=extra.get("thread_sessions_per_user", False),
-            profile=self._session_key_profile(event.source))
+            profile=self._session_key_profile(source))
 
     def _text_batch_key(self, event: "MessageEvent") -> str:
         """Session-scoped key for text batching (subclasses may override)."""
diff --git a/gateway/platforms/qqbot/adapter.py b/gateway/platforms/qqbot/adapter.py
index ee649dcf62..e402373b4e 100644
--- a/gateway/platforms/qqbot/adapter.py
+++ b/gateway/platforms/qqbot/adapter.py
@@ -685,6 +685,12 @@ class QQAdapter(BasePlatformAdapter):
             return bool(session_user) and operator == session_user
         return False
 
+    def _update_prompt_session_key(self, event: InteractionEvent, chat: str) -> str:
+        """Session key an update-prompt click is authorized against, built by the ONE key builder so
+        it carries the profile namespace (a hard-coded ``agent:main:`` prefix never matched a
+        multiplexed secondary bot's lane). No participant: ``c2c`` authorizes on chat == operator."""
+        return self._source_session_key(self.build_source(chat_id=chat, chat_type=event.scene))
+
     async def _default_interaction_dispatch(self, event: InteractionEvent) -> None:
         """Default interaction callback: ``approve:<session_key>:<decision>`` →
         tools.approval.resolve_gateway_approval; ``update_prompt:<answer>`` →
@@ -718,7 +724,7 @@ class QQAdapter(BasePlatformAdapter):
         update_answer = parse_update_prompt_button_data(button_data)
         if update_answer is not None:
             chat = event.group_openid or event.guild_id or event.user_openid
-            if not self._is_authorized_interaction_for_session(event, f"agent:main:qqbot:{event.scene}:{chat}"):
+            if not self._is_authorized_interaction_for_session(event, self._update_prompt_session_key(event, chat)):
                 logger.warning(
                     "[%s] Rejected unauthorized update prompt click (operator=%s)", self._log_tag, event.operator_openid
                 )
diff --git a/gateway/session_lifecycle.py b/gateway/session_lifecycle.py
index 1c037af626..47b3a95489 100644
--- a/gateway/session_lifecycle.py
+++ b/gateway/session_lifecycle.py
@@ -8,6 +8,8 @@ import uuid
 from datetime import datetime, timedelta
 from typing import TYPE_CHECKING, Optional
 
+from hermes_state_ids import new_session_id
+
 if TYPE_CHECKING:
     from gateway.session import SessionEntry, SessionSource
 
@@ -21,7 +23,7 @@ def _now() -> datetime:
 
 
 def _new_session_id(now: datetime) -> str:
-    return f"{now.strftime('%Y%m%d_%H%M%S')}_{uuid.uuid4().hex[:8]}"
+    return new_session_id(now, hex_len=8)
 
 
 def _iso(dt: Optional[datetime]) -> Optional[str]:
diff --git a/hermes_cli/cli_commands_mixin.py b/hermes_cli/cli_commands_mixin.py
index f0d3743e77..bca45fcf51 100644
--- a/hermes_cli/cli_commands_mixin.py
+++ b/hermes_cli/cli_commands_mixin.py
@@ -29,6 +29,7 @@ from rich.markup import escape as _escape
 from rich.panel import Panel
 
 from hermes_constants import display_hermes_home, is_termux as _is_termux_environment
+from hermes_state_ids import new_session_id as mint_session_id
 from agent.turn_context import extract_api_content_sidecar
 from hermes_cli.browser_connect import (
     DEFAULT_BROWSER_CDP_URL, discover_local_cdp_url, find_free_debug_port, is_browser_debug_ready,
@@ -1373,7 +1374,7 @@ class CLICommandsMixin:
             return _cp(_db_unavailable_line())
         branch_name = _command_arg(cmd_original)
         now = datetime.now()
-        new_session_id = f"{now.strftime('%Y%m%d_%H%M%S')}_{uuid.uuid4().hex[:6]}"
+        new_session_id = mint_session_id(now)
         branch_title = branch_name or self._session_db.get_next_title_in_lineage(
             self._session_db.get_session_title(self.session_id) or "branch")
         parent_session_id = self.session_id
diff --git a/hermes_cli/cli_session_mixin.py b/hermes_cli/cli_session_mixin.py
index b807483cf1..5a3ca23afe 100644
--- a/hermes_cli/cli_session_mixin.py
+++ b/hermes_cli/cli_session_mixin.py
@@ -11,9 +11,9 @@ import contextlib
 import os
 import shutil
 import sys
-import uuid
 
 from hermes_constants import get_hermes_home
+from hermes_state_ids import new_session_id
 from pathlib import Path
 from rich.console import Console
 from rich.markup import escape as _escape
@@ -536,7 +536,7 @@ class CLISessionMixin:
             self._discard_session_if_empty(old_session_id)
 
         self.session_start = datetime.now()
-        self.session_id = f"{self.session_start.strftime('%Y%m%d_%H%M%S')}_{uuid.uuid4().hex[:6]}"
+        self.session_id = new_session_id(self.session_start)
         # getattr: tests drive new_session unbound against a SimpleNamespace stand-in.
         getattr(self, "_write_terminal_breadcrumb", lambda: None)()
         self.conversation_history = []
diff --git a/hermes_cli/foreign_sessions.py b/hermes_cli/foreign_sessions.py
index 823a44df8f..c27d9f0113 100644
--- a/hermes_cli/foreign_sessions.py
+++ b/hermes_cli/foreign_sessions.py
@@ -8,13 +8,14 @@ import json
 import os
 import re
 import sys
-import uuid
 from dataclasses import dataclass
 from datetime import datetime
 from pathlib import Path
 from stat import S_ISREG
 from typing import Any, Dict, List, Optional, Tuple
 
+from hermes_state_ids import new_session_id
+
 # User-message texts that are really injected context wrappers, not typed input.
 _WRAPPER_TAG_RE = re.compile(
     r"^<(?:user_instructions|environment_context|recommended_plugins|"
@@ -244,7 +245,7 @@ def import_foreign_session(source: str, path, db=None) -> str:
         from hermes_state import SessionDB
         db = SessionDB()
     try:
-        session_id = f"{datetime.now().strftime('%Y%m%d_%H%M%S')}_{uuid.uuid4().hex[:6]}"
+        session_id = new_session_id()
         origin = {"imported_from": {"tool": tool, "path": str(path), "foreign_session_id": parsed.get("session_id")}}
         db.create_session(session_id, source=tool, cwd=parsed.get("cwd"), origin_json=json.dumps(origin))
         for turn in turns:
diff --git a/hermes_cli/main.py b/hermes_cli/main.py
index b11f7c1599..31c95eec3c 100644
--- a/hermes_cli/main.py
+++ b/hermes_cli/main.py
@@ -1334,11 +1334,10 @@ def _create_titled_session(title: str) -> Optional[str]:
     """
     db = None
     try:
-        import uuid as _uuid
-
         from hermes_state import SessionDB
+        from hermes_state_ids import new_session_id as mint_session_id
 
-        new_session_id = f"{datetime.now().strftime('%Y%m%d_%H%M%S')}_{_uuid.uuid4().hex[:6]}"
+        new_session_id = mint_session_id()
         db = SessionDB()
         db.create_session(new_session_id, source="cli")
         db.set_session_title(new_session_id, title)
diff --git a/hermes_cli/session_lost_and_found.py b/hermes_cli/session_lost_and_found.py
index d915532c24..d4c354c3fc 100644
--- a/hermes_cli/session_lost_and_found.py
+++ b/hermes_cli/session_lost_and_found.py
@@ -15,6 +15,7 @@ from typing import Any, Callable, Optional, Sequence
 
 from hermes_cli.session_schema_history import SCHEMA_HISTORY, reachable_physical_layouts
 
+from hermes_state_ids import SESSION_ID_PATTERN  # timestamp prefix: strongest sentinel for schema-less rows
 from hermes_cli.session_recovery import (
     _AUXILIARY_TABLE_SCHEMAS, _AUXILIARY_TABLES, _CANONICAL_TABLES, _count_rows, _immediate_transaction,
     _placeholder_titles, _quoted_columns, _table_columns,
@@ -22,8 +23,6 @@ from hermes_cli.session_recovery import (
 
 logger = logging.getLogger(__name__)
 
-# Hermes session ids are timestamps (20260812_135332_ab12cd): the strongest sentinel for schema-less rows.
-SESSION_ID_PATTERN = re.compile(r"^\d{8}_\d{6}_")
 MESSAGE_ROLES = frozenset({"user", "assistant", "tool", "system"})
 
 # Values observed in sessions.source across gateway platforms and tooling.
diff --git a/hermes_state_portability.py b/hermes_state_portability.py
index f455ceadd2..2a960ec038 100644
--- a/hermes_state_portability.py
+++ b/hermes_state_portability.py
@@ -12,6 +12,7 @@ from typing import Any, Dict, List, Optional
 from agent.skill_commands import SKILL_SCAFFOLD_SQL_LIKE
 from utils import safe_json_loads
 from hermes_cli.timefmt import coerce_epoch
+from hermes_state_ids import new_session_id
 from hermes_state_common import SCHEMA_SQL, _PREVIEW_RAW_SUBQUERY_SQL, _shape_preview, _sql_session_last_active
 
 # Pre-split logger identity so log filtering/capture is unchanged.
@@ -106,8 +107,7 @@ class SessionPortabilityMixin:
         Reuse the portability validator and message writer so counters and FTS
         obey the same contract as ordinary transcript imports.
         """
-        import uuid
-        session_id = f"{time.strftime('%Y%m%d_%H%M%S')}_{uuid.uuid4().hex[:12]}"
+        session_id = new_session_id(hex_len=12)
         normalized, errors = self._validate_import_payload([
             {"id": session_id, "source": origin["tool"], "title": title,
              "cwd": cwd, "messages": messages}])
diff --git a/tui_gateway/server.py b/tui_gateway/server.py
index e1837564ed..e0c848d454 100644
--- a/tui_gateway/server.py
+++ b/tui_gateway/server.py
@@ -27,6 +27,7 @@ from hermes_constants import (
     reset_hermes_home_override, set_hermes_home_override)
 from hermes_cli.env_loader import load_hermes_dotenv
 from utils import is_truthy_value
+from hermes_state_ids import new_session_id
 from tools.environments.local import hermes_subprocess_env
 from agent.replay_cleanup import sanitize_replay_history
 from agent.compaction_display import project_compaction_message_for_display  # noqa: F401
@@ -2367,7 +2368,7 @@ def _init_session(
 
 
 def _new_session_key() -> str:
-    return f"{datetime.now().strftime('%Y%m%d_%H%M%S')}_{uuid.uuid4().hex[:6]}"
+    return new_session_id()
 
 
 def _with_checkpoints(session, fn):