diff --git a/CHANGELOG.md b/CHANGELOG.md
index 79893c42..851b2b9c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@
 
 - **New RFC: Stable Assistant Turn Anchors for Live-to-Final rendering.** Defines a frontend presentation/reconciliation model for anchoring one assistant turn across live streaming, settlement, replay/reload/recovery, Compact Worklog, Transparent Stream, terminal states, artifacts, and side effects. (#3926)
 
+## [v0.51.353] — 2026-06-10 — Release LQ (cross-client live-turn recovery)
+
+### Fixed
+
+- **Opening an in-progress session from a fresh client now shows the already-streamed text and tool activity.** Switching away from an active session and returning from another device — or a tab with no in-memory snapshot — could previously show an empty or stalled turn until the next token arrived, because the already-emitted progress lived only in browser-local memory. The server now builds a live snapshot from the run journal (`runtime_journal_snapshot` in `GET /api/session`) so a fresh client rebuilds the visible assistant text + tool cards from the server. It composes with the existing run-journal replay cursor (seeds the replay-from sequence so events aren't duplicated) and keys tool cards by the same id aliases as the live path so SSE replay replaces rather than duplicates the restored cards. (#3427, part of the #3400 live-to-final epic)
+
 ## [v0.51.352] — 2026-06-10 — Release LP (medium round: jump-to-response, STATE_DIR warning, J/K nav)
 
 ### Added
diff --git a/api/helpers.py b/api/helpers.py
index 432f3c76..4a39ef9e 100644
--- a/api/helpers.py
+++ b/api/helpers.py
@@ -433,7 +433,8 @@ def _redact_value(v, *, _enabled: bool | None = None):
 def redact_session_data(session_dict: dict) -> dict:
     """Redact credentials from message content, tool data, and session sidecars.
 
-    Applies to: messages[], tool_calls[], todo_state, and title.
+    Applies to: messages[], tool_calls[], todo_state, runtime_journal_snapshot,
+    and title.
     The underlying session file is not modified; redaction is response-layer only.
 
     Reads the ``api_redact_enabled`` setting ONCE for the entire response and
@@ -453,6 +454,11 @@ def redact_session_data(session_dict: dict) -> dict:
         result['tool_calls'] = _redact_value(result['tool_calls'], _enabled=_enabled)
     if 'todo_state' in result:
         result['todo_state'] = _redact_value(result['todo_state'], _enabled=_enabled)
+    if 'runtime_journal_snapshot' in result:
+        result['runtime_journal_snapshot'] = _redact_value(
+            result['runtime_journal_snapshot'],
+            _enabled=_enabled,
+        )
     return result
 
 
diff --git a/api/routes.py b/api/routes.py
index 451fa140..e7ab46a2 100644
--- a/api/routes.py
+++ b/api/routes.py
@@ -1330,6 +1330,222 @@ def _run_journal_status_payload(summary: dict, *, active: bool = False) -> dict:
     }
 
 
+_RUN_JOURNAL_TOOL_ID_KEYS = ("tid", "id", "tool_call_id", "tool_use_id", "call_id")
+
+
+def _run_journal_snapshot_tool_id(payload: dict | None) -> str:
+    if not isinstance(payload, dict):
+        return ""
+    for key in _RUN_JOURNAL_TOOL_ID_KEYS:
+        value = str(payload.get(key) or "").strip()
+        if value:
+            return value
+    return ""
+
+
+def _truncate_journal_snapshot_value(value, *, limit: int = 120):
+    if isinstance(value, str):
+        return value if len(value) <= limit else value[:limit] + "..."
+    if isinstance(value, dict):
+        return {str(k): _truncate_journal_snapshot_value(v, limit=limit) for k, v in value.items()}
+    if isinstance(value, list):
+        return [_truncate_journal_snapshot_value(v, limit=limit) for v in value[:20]]
+    return value
+
+
+def _run_journal_live_snapshot(stream_id: str | None) -> dict | None:
+    stream_id = str(stream_id or "").strip()
+    if not stream_id:
+        return None
+    summary = find_run_summary(stream_id)
+    if not summary:
+        return None
+    session_id = str(summary.get("session_id") or "")
+    if not session_id:
+        return None
+    journal = read_run_events(session_id, stream_id)
+    events = [event for event in (journal.get("events") or []) if isinstance(event, dict)]
+    if not events:
+        return None
+
+    assistant_text = ""
+    reasoning_text = ""
+    messages: list[dict] = []
+    tool_calls: list[dict] = []
+    activity_burst_anchors: list[dict] = []
+    current_activity_burst_id = 0
+    fresh_segment = True
+    last_ts = None
+
+    def mark_boundary() -> int:
+        nonlocal current_activity_burst_id
+        text_end = len(assistant_text)
+        if text_end <= 0:
+            return current_activity_burst_id
+        last_end = max(
+            [int(anchor.get("textEnd") or 0) for anchor in activity_burst_anchors]
+            or [0]
+        )
+        if text_end > last_end:
+            current_activity_burst_id += 1
+            activity_burst_anchors.append(
+                {"id": current_activity_burst_id, "textEnd": text_end}
+            )
+        return current_activity_burst_id
+
+    def update_completed_tool(payload: dict) -> None:
+        tool_id = _run_journal_snapshot_tool_id(payload)
+        name = str(payload.get("name") or "").strip()
+        for call in reversed(tool_calls):
+            if call.get("done"):
+                continue
+            call_id = _run_journal_snapshot_tool_id(call)
+            if (tool_id and call_id == tool_id) or (not tool_id and name and call.get("name") == name):
+                call["done"] = True
+                if payload.get("preview") is not None:
+                    call["snippet"] = str(payload.get("preview") or "")
+                    call["preview"] = call.get("preview") or call["snippet"]
+                if payload.get("duration") is not None:
+                    call["duration"] = payload.get("duration")
+                if payload.get("is_error") is not None:
+                    call["is_error"] = bool(payload.get("is_error"))
+                return
+
+        if not name or name == "clarify":
+            return
+        call = {
+            "name": name,
+            "preview": str(payload.get("preview") or ""),
+            "snippet": str(payload.get("preview") or ""),
+            "args": _truncate_journal_snapshot_value(payload.get("args") or {}),
+            "done": True,
+            "_live": True,
+            "_journal_snapshot": True,
+            "_journal_stream_id": stream_id,
+        }
+        tool_id = _run_journal_snapshot_tool_id(payload)
+        if tool_id:
+            call["tid"] = tool_id
+        for key in _RUN_JOURNAL_TOOL_ID_KEYS:
+            if payload.get(key):
+                call[key] = str(payload.get(key))
+        if current_activity_burst_id:
+            call["activityBurstId"] = current_activity_burst_id
+            call["activitySegmentSeq"] = current_activity_burst_id
+        tool_calls.append(call)
+
+    for event in events:
+        event_name = str(event.get("event") or event.get("type") or "")
+        payload = event.get("payload") if isinstance(event.get("payload"), dict) else {}
+        last_ts = event.get("created_at", last_ts)
+        if event_name == "token":
+            text = str(payload.get("text") or "")
+            if text:
+                assistant_text += text
+                fresh_segment = False
+            continue
+        if event_name == "reasoning":
+            reasoning_text += str(payload.get("text") or "")
+            continue
+        if event_name == "interim_assistant":
+            visible = str(payload.get("text") or "").strip()
+            if visible:
+                if payload.get("already_streamed"):
+                    if not assistant_text:
+                        assistant_text = visible
+                else:
+                    assistant_text = f"{assistant_text}\n\n{visible}" if assistant_text else visible
+                mark_boundary()
+                fresh_segment = True
+            continue
+        if event_name == "tool":
+            name = str(payload.get("name") or "").strip()
+            if not name or name == "clarify":
+                continue
+            boundary_id = mark_boundary()
+            tool_id = _run_journal_snapshot_tool_id(payload)
+            call = {
+                "name": name,
+                "preview": str(payload.get("preview") or ""),
+                "args": _truncate_journal_snapshot_value(payload.get("args") or {}),
+                "done": False,
+                "_live": True,
+                "_journal_snapshot": True,
+                "_journal_stream_id": stream_id,
+            }
+            if tool_id:
+                call["tid"] = tool_id
+            for key in _RUN_JOURNAL_TOOL_ID_KEYS:
+                if payload.get(key):
+                    call[key] = str(payload.get(key))
+            if boundary_id:
+                call["activityBurstId"] = boundary_id
+                call["activitySegmentSeq"] = boundary_id
+            tool_calls.append(call)
+            fresh_segment = True
+            continue
+        if event_name == "tool_complete":
+            update_completed_tool(payload)
+            fresh_segment = True
+
+    if assistant_text or reasoning_text:
+        message = {
+            "role": "assistant",
+            "content": assistant_text,
+            "_live": True,
+            "_journal_snapshot": True,
+            "_journal_stream_id": stream_id,
+        }
+        if reasoning_text:
+            message["reasoning"] = reasoning_text
+        if last_ts is not None:
+            message["_ts"] = last_ts
+        messages.append(message)
+
+    if not messages and not tool_calls:
+        return None
+
+    visible_anchors = [
+        anchor
+        for anchor in activity_burst_anchors
+        if int(anchor.get("textEnd") or 0) < len(assistant_text)
+    ]
+    segment_count = len(visible_anchors) + (1 if assistant_text else 0)
+    current_live_segment_seq = max(segment_count, len(activity_burst_anchors), 0)
+    try:
+        summary_last_seq = max(0, int(summary.get("last_seq") or 0))
+    except (TypeError, ValueError):
+        summary_last_seq = 0
+    try:
+        event_last_seq = max(0, int(events[-1].get("seq") or 0))
+    except (TypeError, ValueError):
+        event_last_seq = 0
+    if event_last_seq >= summary_last_seq:
+        last_seq = event_last_seq
+        last_event_id = events[-1].get("event_id") or (
+            f"{stream_id}:{event_last_seq}" if event_last_seq else summary.get("last_event_id")
+        )
+    else:
+        last_seq = summary_last_seq
+        last_event_id = summary.get("last_event_id") or events[-1].get("event_id")
+
+    return {
+        "session_id": session_id,
+        "stream_id": stream_id,
+        "last_seq": last_seq,
+        "last_event_id": last_event_id,
+        "event_count": len(events),
+        "fresh_segment": fresh_segment,
+        "messages": messages,
+        "tool_calls": tool_calls,
+        "last_assistant_text": assistant_text,
+        "last_reasoning_text": reasoning_text,
+        "activity_burst_anchors": activity_burst_anchors,
+        "current_activity_burst_id": current_activity_burst_id,
+        "current_live_segment_seq": current_live_segment_seq,
+    }
+
+
 def _ensure_full_session_before_mutation(sid: str, session):
     """Reload cached metadata-only sessions before mutating persisted fields.
 
@@ -5691,6 +5907,19 @@ def handle_get(handler, parsed) -> bool:
                         journal,
                         active=journal_active,
                     )
+                    if journal_active:
+                        try:
+                            snapshot = _run_journal_live_snapshot(original_stream_id)
+                        except Exception:
+                            logger.debug(
+                                "Failed to build runtime journal snapshot for %s",
+                                original_stream_id,
+                                exc_info=True,
+                            )
+                            snapshot = None
+                        if snapshot:
+                            raw["runtime_journal_snapshot"] = snapshot
+                            raw["pending_attachments"] = getattr(s, "pending_attachments", []) or []
             # Cold-load: derive the latest settled todo snapshot from the full
             # merged transcript, not the truncated display window. This keeps
             # the Todos panel correct after refresh even when the latest todo
diff --git a/static/messages.js b/static/messages.js
index 69e5a3d7..89cec5c2 100644
--- a/static/messages.js
+++ b/static/messages.js
@@ -1898,13 +1898,13 @@ function attachLiveStream(activeSid, streamId, uploaded=[], options={}){
     const byTid=new Map();
     liveCalls.forEach((tc,idx)=>{
       if(!tc||typeof tc!=='object') return;
-      const tid=tc.tid||tc.id||tc.tool_call_id||tc.call_id||'';
+      const tid=tc.tid||tc.id||tc.tool_call_id||tc.tool_use_id||tc.call_id||'';
       if(tid&&!byTid.has(tid)) byTid.set(tid,{tc,idx});
     });
     const used=new Set();
     return (rawCalls||[]).map((raw,idx)=>{
       const next={...(raw||{}),done:true};
-      const tid=next.tid||next.id||next.tool_call_id||next.call_id||'';
+      const tid=next.tid||next.id||next.tool_call_id||next.tool_use_id||next.call_id||'';
       let matchEntry=tid?byTid.get(tid):null;
       if(!matchEntry){
         const name=next.name||((next.function||{}).name)||'';
@@ -2463,7 +2463,7 @@ function attachLiveStream(activeSid, streamId, uploaded=[], options={}){
   }
 
   function _liveToolTid(d, activityBurstId, activitySegmentSeq){
-    const explicit=String(d&&d.tid||'').trim();
+    const explicit=String(d&&(d.tid||d.id||d.tool_call_id||d.tool_use_id||d.call_id)||'').trim();
     if(explicit) return explicit;
     return `live-${activeSid}-${_hashString(_toolCallSignature(d,activityBurstId,activitySegmentSeq))}`;
   }
@@ -2491,7 +2491,7 @@ function attachLiveStream(activeSid, streamId, uploaded=[], options={}){
         const candidate=toolCalls[i];
         if(!candidate||typeof candidate!=='object') continue;
         if(!allowDone&&candidate.done===true) continue;
-        const candidateTid=String(candidate.tid||candidate.id||candidate.tool_call_id||candidate.call_id||'');
+        const candidateTid=String(candidate.tid||candidate.id||candidate.tool_call_id||candidate.tool_use_id||candidate.call_id||'');
         if(candidateTid&&candidateTid===wantedTid) return i;
       }
     }
@@ -2561,7 +2561,7 @@ function attachLiveStream(activeSid, streamId, uploaded=[], options={}){
     if(!Array.isArray(inflight.toolCalls)) inflight.toolCalls=[];
     if(!Array.isArray(inflight.messages)) inflight.messages=[...(inflight.messages||[])];
 
-    const explicitTid=String(d&&d.tid||'').trim();
+    const explicitTid=String(d&&d.tid||d&&d.id||d&&d.tool_call_id||d&&d.tool_use_id||d&&d.call_id||'').trim();
     const isComplete=phase==='complete';
     let signature=_toolCallSignature(d,current.burstId,current.segmentSeq);
     let index=-1;
diff --git a/static/sessions.js b/static/sessions.js
index e89de870..89f82b55 100644
--- a/static/sessions.js
+++ b/static/sessions.js
@@ -454,6 +454,63 @@ function _inflightHasVisibleLiveState(inflight) {
   return false;
 }
 
+function _serverLiveSnapshotToolId(tc){
+  return String(tc&&(tc.tid||tc.id||tc.tool_call_id||tc.tool_use_id||tc.call_id||'')||'').trim();
+}
+
+function _serverLiveSnapshotInflight(snapshot, uploaded){
+  if(!snapshot||typeof snapshot!=='object') return null;
+  const rawMessages=Array.isArray(snapshot.messages)?snapshot.messages:[];
+  const messages=rawMessages
+    .filter(m=>m&&m.role)
+    .map(m=>({...m,_live:m._live!==false,_journal_snapshot:true}));
+  const rawToolCalls=Array.isArray(snapshot.tool_calls)?snapshot.tool_calls:[];
+  const toolCalls=rawToolCalls
+    .filter(tc=>tc&&tc.name)
+    .map(tc=>{
+      const next={...tc,_live:true,_journal_snapshot:true};
+      const tid=_serverLiveSnapshotToolId(next);
+      if(tid&&!next.tid) next.tid=tid;
+      return next;
+    });
+  let lastAssistantText=String(snapshot.last_assistant_text||snapshot.lastAssistantText||'');
+  let lastReasoningText=String(snapshot.last_reasoning_text||snapshot.lastReasoningText||'');
+  const lastLiveAssistant=[...messages].reverse().find(m=>m&&m.role==='assistant'&&m._live);
+  if(lastLiveAssistant){
+    if(!lastAssistantText&&typeof lastLiveAssistant.content==='string') lastAssistantText=lastLiveAssistant.content;
+    if(!lastReasoningText&&typeof lastLiveAssistant.reasoning==='string') lastReasoningText=lastLiveAssistant.reasoning;
+  }
+  if((lastAssistantText||lastReasoningText)&&!lastLiveAssistant){
+    messages.push({
+      role:'assistant',
+      content:lastAssistantText,
+      reasoning:lastReasoningText||undefined,
+      _live:true,
+      _journal_snapshot:true,
+    });
+  }
+  if(!messages.length&&!toolCalls.length&&!lastAssistantText&&!lastReasoningText) return null;
+  const replayAfterSeq=Number(snapshot.last_seq||0);
+  const activityBurstAnchors=Array.isArray(snapshot.activity_burst_anchors)
+    ? snapshot.activity_burst_anchors
+    : (Array.isArray(snapshot.activityBurstAnchors)?snapshot.activityBurstAnchors:[]);
+  return {
+    messages,
+    uploaded:Array.isArray(uploaded)?[...uploaded]:[],
+    toolCalls,
+    todos:null,
+    todoStateMeta:null,
+    reattach:true,
+    journalSnapshot:true,
+    lastAssistantText,
+    lastReasoningText,
+    lastRunJournalSeq:Number.isFinite(replayAfterSeq)?Math.max(0,replayAfterSeq):0,
+    currentActivityBurstId:Number(snapshot.current_activity_burst_id||snapshot.currentActivityBurstId||0)||0,
+    currentLiveSegmentSeq:Number(snapshot.current_live_segment_seq||snapshot.currentLiveSegmentSeq||0)||0,
+    activityBurstAnchors,
+  };
+}
+
 function _rememberRenderedSessionSnapshot(s) {
   if (!s || !s.session_id) return;
   const previous = _sessionListSnapshotById.get(s.session_id);
@@ -999,6 +1056,13 @@ async function loadSession(sid){
     if(typeof clearInflightState==='function') clearInflightState(sid);
   }
 
+  const serverLiveSnapshot=activeStreamId
+    ? _serverLiveSnapshotInflight(S.session.runtime_journal_snapshot, S.session.pending_attachments||[])
+    : null;
+  if(serverLiveSnapshot&&(!INFLIGHT[sid]||!_inflightHasVisibleLiveState(INFLIGHT[sid]))){
+    INFLIGHT[sid]=serverLiveSnapshot;
+  }
+
   if(INFLIGHT[sid]){
     _ensureInflightLiveAssistantMessage(INFLIGHT[sid]);
     const inflightMessages=_projectInflightMessagesForActivityBursts(INFLIGHT[sid]);
diff --git a/tests/test_run_journal_frontend_static.py b/tests/test_run_journal_frontend_static.py
index 9a100584..d8e816e3 100644
--- a/tests/test_run_journal_frontend_static.py
+++ b/tests/test_run_journal_frontend_static.py
@@ -3,6 +3,7 @@ from pathlib import Path
 
 ROOT = Path(__file__).resolve().parents[1]
 MESSAGES_SRC = (ROOT / "static" / "messages.js").read_text()
+SESSIONS_SRC = (ROOT / "static" / "sessions.js").read_text()
 
 
 def test_reattach_path_uses_replay_when_status_reports_journal():
@@ -107,3 +108,34 @@ def test_run_journal_cursor_tracks_every_long_task_timeline_event():
         assert f"'{event_name}'" in cursor_loop, (
             f"{event_name} must advance the replay cursor to avoid duplicate timeline replay"
         )
+
+
+def test_server_runtime_journal_snapshot_restores_structured_inflight_state():
+    helper_pos = SESSIONS_SRC.index("function _serverLiveSnapshotToolId")
+    helper_block = SESSIONS_SRC[helper_pos : helper_pos + 2600]
+    load_pos = SESSIONS_SRC.index("async function loadSession")
+    load_block = SESSIONS_SRC[load_pos : load_pos + 18000]
+
+    assert "runtime_journal_snapshot" in load_block
+    assert "_serverLiveSnapshotInflight(S.session.runtime_journal_snapshot" in load_block
+    assert "!_inflightHasVisibleLiveState(INFLIGHT[sid])" in load_block
+    assert "journalSnapshot:true" in helper_block
+    assert "lastRunJournalSeq" in helper_block
+    assert "last_assistant_text" in helper_block
+    assert "activity_burst_anchors" in helper_block
+    for key in ("tid", "id", "tool_call_id", "tool_use_id", "call_id"):
+        assert key in helper_block
+
+
+def test_live_tool_matching_uses_the_same_aliases_as_live_card_dedup():
+    live_tid_pos = MESSAGES_SRC.index("function _liveToolTid")
+    live_tid_block = MESSAGES_SRC[live_tid_pos : live_tid_pos + 450]
+    find_pos = MESSAGES_SRC.index("function _findPendingLiveToolCallIndex")
+    find_block = MESSAGES_SRC[find_pos : find_pos + 900]
+    upsert_pos = MESSAGES_SRC.index("function upsertLiveToolCall")
+    upsert_block = MESSAGES_SRC[upsert_pos : upsert_pos + 600]
+
+    for key in ("tid", "id", "tool_call_id", "tool_use_id", "call_id"):
+        assert key in live_tid_block
+        assert key in find_block
+        assert key in upsert_block
diff --git a/tests/test_run_journal_routes.py b/tests/test_run_journal_routes.py
index bae7aacd..6767384b 100644
--- a/tests/test_run_journal_routes.py
+++ b/tests/test_run_journal_routes.py
@@ -264,11 +264,108 @@ def test_replay_emits_event_ids_and_stale_restart_diagnostic():
 def test_session_payload_exposes_runtime_journal_for_stale_streams():
     assert "original_stream_id = getattr(s, \"active_stream_id\", None)" in ROUTES_SRC
     assert '"runtime_journal"' in ROUTES_SRC
+    assert '"runtime_journal_snapshot"' in ROUTES_SRC
+    assert "_run_journal_live_snapshot(original_stream_id)" in ROUTES_SRC
     assert 'terminal_state = "lost-worker-bookkeeping"' in ROUTES_SRC
     assert "active=journal_active" in ROUTES_SRC
     assert "journal_active = bool(original_stream_id in active_stream_ids)" in ROUTES_SRC
 
 
+def test_live_journal_snapshot_reconstructs_visible_progress_and_tool_aliases(monkeypatch):
+    import api.routes as routes
+
+    monkeypatch.setattr(
+        routes,
+        "find_run_summary",
+        lambda stream_id: {
+            "session_id": "session_1",
+            "run_id": stream_id,
+            "last_seq": 4,
+            "last_event_id": f"{stream_id}:4",
+        },
+    )
+    monkeypatch.setattr(
+        routes,
+        "read_run_events",
+        lambda session_id, run_id: {
+            "events": [
+                {
+                    "seq": 1,
+                    "event": "token",
+                    "payload": {"text": "First segment."},
+                    "event_id": f"{run_id}:1",
+                    "created_at": 1000.0,
+                },
+                {
+                    "seq": 2,
+                    "event": "tool",
+                    "payload": {
+                        "name": "terminal",
+                        "preview": "running tests",
+                        "tool_use_id": "toolu_123",
+                        "args": {"command": "pytest -q", "extra": "x" * 200},
+                    },
+                    "event_id": f"{run_id}:2",
+                },
+                {
+                    "seq": 3,
+                    "event": "tool_complete",
+                    "payload": {
+                        "name": "terminal",
+                        "preview": "passed",
+                        "tool_use_id": "toolu_123",
+                        "duration": 1.25,
+                    },
+                    "event_id": f"{run_id}:3",
+                },
+                {
+                    "seq": 4,
+                    "event": "reasoning",
+                    "payload": {"text": "Checked result."},
+                    "event_id": f"{run_id}:4",
+                },
+                {
+                    "seq": 5,
+                    "event": "token",
+                    "payload": {"text": " Second segment."},
+                    "event_id": f"{run_id}:5",
+                    "created_at": 1001.0,
+                },
+            ]
+        },
+    )
+
+    snapshot = routes._run_journal_live_snapshot("run_1")
+
+    assert snapshot["last_seq"] == 5
+    assert snapshot["last_event_id"] == "run_1:5"
+    assert snapshot["last_assistant_text"] == "First segment. Second segment."
+    assert snapshot["last_reasoning_text"] == "Checked result."
+    assert snapshot["current_live_segment_seq"] == 2
+    assert snapshot["activity_burst_anchors"] == [{"id": 1, "textEnd": len("First segment.")}]
+    assert snapshot["messages"] == [
+        {
+            "role": "assistant",
+            "content": "First segment. Second segment.",
+            "reasoning": "Checked result.",
+            "_live": True,
+            "_journal_snapshot": True,
+            "_journal_stream_id": "run_1",
+            "_ts": 1001.0,
+        }
+    ]
+    tool = snapshot["tool_calls"][0]
+    assert tool["name"] == "terminal"
+    assert tool["done"] is True
+    assert tool["tid"] == "toolu_123"
+    assert tool["tool_use_id"] == "toolu_123"
+    assert tool["activityBurstId"] == 1
+    assert tool["activitySegmentSeq"] == 1
+    assert tool["snippet"] == "passed"
+    assert tool["duration"] == 1.25
+    assert len(tool["args"]["extra"]) <= 123
+
+
 def test_status_payload_marks_non_terminal_dead_journal_as_stale():
     import api.routes as routes
 
diff --git a/tests/test_security_redaction.py b/tests/test_security_redaction.py
index 86a22e50..457c2625 100644
--- a/tests/test_security_redaction.py
+++ b/tests/test_security_redaction.py
@@ -304,6 +304,34 @@ def test_redact_session_data_todo_state_sidecar():
     assert result["todo_state"]["todos"][0]["status"] == "pending"
 
 
+def test_redact_session_data_runtime_journal_snapshot():
+    """redact_session_data masks credentials in active run-journal snapshots."""
+    from api.helpers import redact_session_data
+    session = {
+        "session_id": "journal-redact",
+        "messages": [],
+        "tool_calls": [],
+        "runtime_journal_snapshot": {
+            "messages": [
+                {"role": "assistant", "content": f"token echoed: {_FAKE_GITHUB_PAT}"},
+            ],
+            "tool_calls": [
+                {
+                    "name": "terminal",
+                    "preview": f"using {_FAKE_SK_KEY}",
+                    "args": {"command": f"export TOKEN={_FAKE_GITHUB_PAT}"},
+                },
+            ],
+            "last_assistant_text": f"assistant saw {_FAKE_HF_TOKEN}",
+            "last_reasoning_text": f"reasoning saw {_FAKE_AWS_KEY}",
+        },
+    }
+    result = redact_session_data(session)
+    dump = json.dumps(result)
+    _assert_no_plaintext_credentials(dump, "runtime_journal_snapshot redaction")
+    assert result["runtime_journal_snapshot"]["tool_calls"][0]["name"] == "terminal"
+
+
 def test_redact_session_data_multiple_cred_types():
     """redact_session_data handles sk-, ghp_, hf_, and AKIA keys."""
     from api.helpers import redact_session_data