diff --git a/chat/state/manual_edit.py b/chat/state/manual_edit.py
index 57e6c3b..3bfff79 100644
--- a/chat/state/manual_edit.py
+++ b/chat/state/manual_edit.py
@@ -24,6 +24,12 @@ T72.1 (Phase 2.5) adds one list-shaped edit:
   by string equality so the route handler doesn't have to track fact
   indices across re-renders.
 
+T72.3 adds a per-flag witness toggle:
+- ``memory_witness`` — flip one of ``witness_you`` / ``witness_host`` /
+  ``witness_guest`` on a memory row. Payload's ``new_value`` is a dict
+  ``{"flag": "you"|"host"|"guest", "value": 0|1}`` and ``prior_value``
+  mirrors the same shape so an inverse edit can restore the flag.
+
 Pin toggles intentionally use the existing ``memory_pin_changed`` event
 (registered in :mod:`chat.state.memory`) rather than ``manual_edit`` so
 the projection writes both ``pinned`` and ``auto_pinned`` atomically.
@@ -37,6 +43,8 @@ from sqlite3 import Connection
 from chat.eventlog.log import Event
 from chat.eventlog.projector import on
 
+_VALID_WITNESS_FLAGS = {"you", "host", "guest"}
+
 
 def _clamp(value: int, lo: int, hi: int) -> int:
     return max(lo, min(hi, value))
@@ -120,5 +128,15 @@ def _apply_manual_edit(conn: Connection, e: Event) -> None:
                     target_id["target_id"],
                 ),
             )
+    elif kind == "memory_witness":
+        # T72.3: toggle one of the three witness flags on a memory row.
+        # ``new_value`` is the dict ``{"flag", "value"}``; ``prior_value``
+        # mirrors the same shape so an inverse edit restores the flag.
+        flag = new_value["flag"]
+        if flag in _VALID_WITNESS_FLAGS:
+            conn.execute(
+                f"UPDATE memories SET witness_{flag} = ? WHERE id = ?",
+                (1 if int(new_value["value"]) else 0, int(target_id)),
+            )
     # Unknown target_kind: silently no-op for v1. Future kinds (activity
     # fields, etc.) extend the dispatch above.
diff --git a/chat/templates/_drawer.html b/chat/templates/_drawer.html
index 228a440..2cf48a7 100644
--- a/chat/templates/_drawer.html
+++ b/chat/templates/_drawer.html
@@ -347,6 +347,23 @@
               <input type="hidden" name="pinned" value="{{ 0 if m.pinned else 1 }}">
               <button type="submit">{{ 'Unpin' if m.pinned else 'Pin' }}</button>
             </form>
+            <div class="witness-row">
+              {% for flag in ['you', 'host', 'guest'] %}
+                {% set witnessed = m['witness_' ~ flag] %}
+                <form class="inline-edit"
+                      hx-post="/chats/{{ chat.id }}/drawer/memory/witness"
+                      hx-target="#drawer" hx-swap="innerHTML">
+                  <input type="hidden" name="memory_id" value="{{ m.id }}">
+                  <input type="hidden" name="flag" value="{{ flag }}">
+                  <input type="hidden" name="new_value" value="{{ 0 if witnessed else 1 }}">
+                  <label>
+                    <input type="checkbox" {% if witnessed %}checked{% endif %}
+                           onchange="this.form.requestSubmit()">
+                    {{ flag }}
+                  </label>
+                </form>
+              {% endfor %}
+            </div>
             <details>
               <summary>Edit POV summary</summary>
               <form class="inline-edit"
diff --git a/chat/web/drawer.py b/chat/web/drawer.py
index a2928ff..fdfbda4 100644
--- a/chat/web/drawer.py
+++ b/chat/web/drawer.py
@@ -125,10 +125,13 @@ async def drawer(chat_id: str, request: Request, conn=Depends(get_conn)):
 
     # Recent memories from host's POV (witness_host = 1), most recent first.
     # Raw query keeps this read self-contained — no projector helper exposes
-    # "latest N for an owner" yet and the drawer is the only consumer.
+    # "latest N for an owner" yet and the drawer is the only consumer. The
+    # three witness flags ride along so T72.3's per-row checkboxes can
+    # render the current state without a second query per memory.
     recent_rows = conn.execute(
         """
-        SELECT id, pov_summary, significance, pinned, created_at
+        SELECT id, pov_summary, significance, pinned, created_at,
+               witness_you, witness_host, witness_guest
         FROM memories
         WHERE owner_id = ? AND witness_host = 1
         ORDER BY id DESC
@@ -143,6 +146,9 @@ async def drawer(chat_id: str, request: Request, conn=Depends(get_conn)):
             "significance": r[2],
             "pinned": r[3],
             "created_at": r[4],
+            "witness_you": r[5],
+            "witness_host": r[6],
+            "witness_guest": r[7],
         }
         for r in recent_rows
     ]
@@ -572,6 +578,69 @@ async def edit_edge_knowledge_facts(
     return await drawer(chat_id, request, conn)
 
 
+# --- T72.3 witness flag inline-edit --------------------------------------
+#
+# Witness flags decide which entities can recall a memory (§7 retrieval).
+# Editing them is rare but high-impact — flipping ``witness_guest`` from 0
+# to 1 makes the memory available to the guest's prompt context. The route
+# follows the T25 / T72.1 pattern: snapshot prior, append + apply
+# ``manual_edit`` with a ``{flag, value}`` payload, refresh the partial.
+
+
+_VALID_WITNESS_FLAGS = ("you", "host", "guest")
+
+
+@router.post(
+    "/chats/{chat_id}/drawer/memory/witness",
+    response_class=HTMLResponse,
+)
+async def edit_memory_witness(
+    chat_id: str,
+    request: Request,
+    memory_id: int = Form(...),
+    flag: str = Form(...),
+    new_value: int = Form(...),
+    conn=Depends(get_conn),
+):
+    chat = get_chat(conn, chat_id)
+    if chat is None:
+        raise HTTPException(status_code=404, detail=f"chat not found: {chat_id}")
+
+    if flag not in _VALID_WITNESS_FLAGS:
+        raise HTTPException(
+            status_code=400,
+            detail=(
+                f"flag must be one of {list(_VALID_WITNESS_FLAGS)}, "
+                f"got {flag!r}"
+            ),
+        )
+
+    row = conn.execute(
+        f"SELECT witness_{flag} FROM memories "
+        "WHERE id = ? AND chat_id = ?",
+        (int(memory_id), chat_id),
+    ).fetchone()
+    if row is None:
+        raise HTTPException(
+            status_code=404,
+            detail=f"memory not found in chat: {memory_id}",
+        )
+
+    prior_int = int(row[0])
+    new_int = 1 if int(new_value) else 0
+    append_and_apply(
+        conn,
+        kind="manual_edit",
+        payload={
+            "target_kind": "memory_witness",
+            "target_id": int(memory_id),
+            "prior_value": {"flag": flag, "value": prior_int},
+            "new_value": {"flag": flag, "value": new_int},
+        },
+    )
+    return await drawer(chat_id, request, conn)
+
+
 # --- T42 guest add/remove -------------------------------------------------
 #
 # Adding a guest fans out into up to four events: a ``guest_added`` to flip
diff --git a/tests/test_drawer_edits_extended.py b/tests/test_drawer_edits_extended.py
index 670ead6..47c8f6d 100644
--- a/tests/test_drawer_edits_extended.py
+++ b/tests/test_drawer_edits_extended.py
@@ -1,4 +1,4 @@
-"""T72.1: deferred v1 drawer edits.
+"""T72: deferred v1 drawer edits + witness flag inline-edit.
 
 T25 shipped affinity / significance / pin. T72.1 fills in the rest of the
 §6.4 editable surface whose ``manual_edit`` projector dispatch was already
@@ -9,11 +9,14 @@ in place (or, for ``edge_knowledge_fact``, added alongside the route):
 * ``POST /chats/{chat_id}/drawer/memory/pov-summary`` — textarea, capped.
 * ``POST /chats/{chat_id}/drawer/edge/knowledge-facts`` — add/remove fact.
 
+T72.3 layers a witness-flag toggle on top:
+
+* ``POST /chats/{chat_id}/drawer/memory/witness`` — ``manual_edit`` with
+  ``target_kind`` = ``memory_witness`` and a ``{flag, value}`` payload.
+
 Each test asserts (a) the ``manual_edit`` event lands in the log,
 (b) the projected table reflects the new value, and (c) the response is
 the refreshed drawer partial.
-
-T72.3's witness-flag tests extend this file with the inline-edit pair.
 """
 
 from __future__ import annotations
@@ -325,3 +328,76 @@ def test_edit_edge_knowledge_facts_400_on_bad_action(client, tmp_path):
     assert response.status_code == 400
 
 
+# --- T72.3 tests (witness flag inline-edit) -------------------------------
+
+
+def test_witness_flag_toggle_updates_memory_row(client, tmp_path):
+    """Memory seeded with witness [you=1, host=1, guest=0]; toggling
+    ``guest`` to 1 lands as ``witness_guest = 1`` after projection.
+    """
+    _seed(tmp_path / "test.db")
+    with open_db(tmp_path / "test.db") as conn:
+        memory_id = conn.execute("SELECT id FROM memories LIMIT 1").fetchone()[0]
+
+    response = client.post(
+        "/chats/chat_bot_a/drawer/memory/witness",
+        data={
+            "memory_id": str(memory_id),
+            "flag": "guest",
+            "new_value": "1",
+        },
+    )
+    assert response.status_code == 200
+
+    with open_db(tmp_path / "test.db") as conn:
+        row = conn.execute(
+            "SELECT witness_you, witness_host, witness_guest "
+            "FROM memories WHERE id = ?",
+            (memory_id,),
+        ).fetchone()
+        assert row == (1, 1, 1)
+
+
+def test_witness_flag_toggle_emits_manual_edit_event(client, tmp_path):
+    _seed(tmp_path / "test.db")
+    with open_db(tmp_path / "test.db") as conn:
+        memory_id = conn.execute("SELECT id FROM memories LIMIT 1").fetchone()[0]
+
+    response = client.post(
+        "/chats/chat_bot_a/drawer/memory/witness",
+        data={
+            "memory_id": str(memory_id),
+            "flag": "guest",
+            "new_value": "1",
+        },
+    )
+    assert response.status_code == 200
+
+    with open_db(tmp_path / "test.db") as conn:
+        rows = conn.execute(
+            "SELECT payload_json FROM event_log WHERE kind = 'manual_edit'"
+        ).fetchall()
+        assert len(rows) == 1
+        payload = json.loads(rows[0][0])
+        assert payload["target_kind"] == "memory_witness"
+        assert payload["target_id"] == memory_id
+        assert payload["prior_value"] == {"flag": "guest", "value": 0}
+        assert payload["new_value"] == {"flag": "guest", "value": 1}
+
+
+def test_witness_flag_toggle_400_on_bad_flag(client, tmp_path):
+    _seed(tmp_path / "test.db")
+    with open_db(tmp_path / "test.db") as conn:
+        memory_id = conn.execute("SELECT id FROM memories LIMIT 1").fetchone()[0]
+
+    response = client.post(
+        "/chats/chat_bot_a/drawer/memory/witness",
+        data={
+            "memory_id": str(memory_id),
+            "flag": "narrator",
+            "new_value": "1",
+        },
+    )
+    assert response.status_code == 400
+
+