diff --git a/agent/learning_mutations.py b/agent/learning_mutations.py
index 7566fa216..c723b6153 100644
--- a/agent/learning_mutations.py
+++ b/agent/learning_mutations.py
@@ -20,7 +20,6 @@ from __future__ import annotations
 from pathlib import Path
 from typing import Any
 
-_MEMORY_DELIM = "\n§\n"
 _MEMORY_FILES = {"memory": "MEMORY.md", "profile": "USER.md"}
 
 
@@ -63,20 +62,18 @@ def _memory_local_index(source: str, global_index: int) -> int:
     return global_index - sum(1 for c in cards if c.get("source") == "memory")
 
 
-def _read_chunks(path: Path) -> list[str]:
-    """Raw ``§``-delimited chunks, preserving formatting; empties dropped to
-    match ``_memory_cards`` indexing."""
-    text = path.read_text(encoding="utf-8")
-
-    return [c for c in text.split(_MEMORY_DELIM) if c.strip()]
-
-
 def _locate_memory(source: str, gidx: int) -> tuple[Path, list[str], int]:
-    """Resolve a memory card to its file, all chunks, and local index."""
+    """Resolve a memory card to its file, all §-delimited entries, and local index.
+
+    Entries come from ``MemoryStore._read_file`` — the same parser the memory
+    tool uses — so journey indices stay aligned with what the graph renders.
+    """
+    from tools.memory_tool import MemoryStore
+
     path = _memories_dir() / _MEMORY_FILES[source]
     if not path.exists():
         raise ValueError(f"{path.name} not found")
-    chunks = _read_chunks(path)
+    chunks = MemoryStore._read_file(path)
     local = _memory_local_index(source, gidx)
     if not 0 <= local < len(chunks):
         raise ValueError("memory node id is stale — refresh the graph")
@@ -149,7 +146,7 @@ def _delete_memory(node_id: str) -> dict[str, Any]:
     path, chunks, local = _locate_memory(source, gidx)
 
     del chunks[local]
-    _write_chunks(path, chunks)
+    _write_memory(path, chunks)
 
     return {"ok": True, "message": f"deleted memory from {path.name}"}
 
@@ -184,7 +181,7 @@ def _edit_memory(node_id: str, content: str) -> dict[str, Any]:
     path, chunks, local = _locate_memory(source, gidx)
 
     chunks[local] = body
-    _write_chunks(path, chunks)
+    _write_memory(path, chunks)
 
     return {"ok": True, "message": f"updated memory in {path.name}"}
 
@@ -192,9 +189,12 @@ def _edit_memory(node_id: str, content: str) -> dict[str, Any]:
 # ── Helpers ─────────────────────────────────────────────────────────────────
 
 
-def _write_chunks(path: Path, chunks: list[str]) -> None:
-    body = _MEMORY_DELIM.join(c.strip() for c in chunks)
-    path.write_text(f"{body}\n" if body else "", encoding="utf-8")
+def _write_memory(path: Path, chunks: list[str]) -> None:
+    """Atomic temp-file + rename via the memory tool, so a concurrent reader
+    never sees a half-written file (and the §-join stays single-sourced)."""
+    from tools.memory_tool import MemoryStore
+
+    MemoryStore._write_file(path, [c.strip() for c in chunks if c.strip()])
 
 
 def _clear_skill_cache() -> None:
diff --git a/apps/desktop/src/app/starmap/star-map.tsx b/apps/desktop/src/app/starmap/star-map.tsx
index d4427c0ea..a1a5b652c 100644
--- a/apps/desktop/src/app/starmap/star-map.tsx
+++ b/apps/desktop/src/app/starmap/star-map.tsx
@@ -10,13 +10,13 @@ import type { StarmapGraph } from '@/types/hermes'
 import { computePalette, memoryInkFor, resolveRgb, rgba } from './color'
 import { RING_OUTER, TILT, ZOOM_MAX, ZOOM_MIN } from './constants'
 import { clamp, distToSegmentSq, fitScale, fitViewport, nodeRadius } from './geometry'
+import { NodeContextMenu, type NodeMenuTarget } from './node-context-menu'
 import { drawScene, drawScramble } from './render'
 import { decodeShareCode, encodeShareCode, ShareCodeError } from './share-code'
 import { ShareControls } from './share-controls'
 import { buildSimulation } from './simulation'
 import { formatDate } from './text'
 import { buildTimeAxis, dateAtReveal, type TimeAxis } from './time-axis'
-import { NodeContextMenu, type NodeMenuTarget } from './node-context-menu'
 import { Timeline } from './timeline'
 import type { FadeBuckets, MemoryCard, Palette, Ring, RingLabelRect, SimLink, SimNode, Viewport } from './types'
 
@@ -918,10 +918,10 @@ export function StarMap({
     <div className="relative min-h-0 flex-1 overflow-hidden" ref={wrapRef}>
       <canvas
         className="block touch-none select-none text-foreground"
+        onContextMenu={onContextMenu}
         onDoubleClick={resetView}
         onMouseDown={onMouseDown}
         onMouseLeave={onMouseLeave}
-        onContextMenu={onContextMenu}
         onMouseMove={onMouseMove}
         onMouseUp={endDrag}
         onWheel={onWheel}
diff --git a/tests/agent/test_learning_mutations.py b/tests/agent/test_learning_mutations.py
index 79afa4d13..dc2f562d0 100644
--- a/tests/agent/test_learning_mutations.py
+++ b/tests/agent/test_learning_mutations.py
@@ -112,3 +112,17 @@ def test_edit_skill_rewrites_and_validates(home):
 
 def test_missing_skill_detail(home):
     assert not lm.node_detail("nonexistent-skill")["ok"]
+
+
+def test_memory_writes_match_memory_tool_format(home):
+    """A journey mutation must leave the file byte-identical to what the memory
+    tool itself writes — same §-join, no trailing-newline drift — so the two
+    surfaces never fight over format and indices stay aligned."""
+    from tools.memory_tool import ENTRY_DELIMITER, MemoryStore
+
+    assert lm.edit_node("memory:memory:0", "alpha rewritten")["ok"]
+    path = home / "memories" / "MEMORY.md"
+    entries = MemoryStore._read_file(path)
+
+    assert entries == ["alpha rewritten", "beta note"]
+    assert path.read_text(encoding="utf-8") == ENTRY_DELIMITER.join(entries)