diff --git a/sandbox/default.yaml b/sandbox/default.yaml
index f5c0948..9012fd5 100644
--- a/sandbox/default.yaml
+++ b/sandbox/default.yaml
@@ -27,6 +27,7 @@ filesystem:
     - "{XDG_CONFIG_HOME}/gh"
     - "{XDG_DATA_HOME}/gh/extensions"
     - "/dev"
+    - "{HOME}/img"
   rw:
     - "{OLLIE_MEMORY_PATH}"
     - "{OLLIE_PLAN_PATH}"
@@ -75,6 +76,7 @@ filesystem:
     - "/dev/random"
     - "/dev/null"
     - "/dev/fuse"
+    - "{PCFS}"
   rox:
     - "/usr"
     - "/lib"
@@ -135,5 +137,6 @@ env:
   - EDITOR
   - GIT_SEQUENCE_EDITOR
   - SUPERPOWERD_SESSION_TOKEN
+  - PCFS
 network:
   unrestricted: true
diff --git a/tools/file_read b/tools/file_read
index 533230e..cd8d92e 100755
--- a/tools/file_read
+++ b/tools/file_read
@@ -5,10 +5,10 @@
 
 import sys
 import os
+from itertools import islice
 
 MAX_LINES = 2000
 MAX_LINE_LEN = 2000
-MAX_SIZE = 8 * 1024 * 1024
 
 if len(sys.argv) < 2:
     print("usage: file_read <file_path> [start] [end]")
@@ -30,24 +30,21 @@ if not os.path.isfile(file_path):
     print(f"error: not a regular file: {file_path}")
     sys.exit(1)
 
-size = os.path.getsize(file_path)
-if size > MAX_SIZE:
-    print(f"error: file too large ({size} bytes, max {MAX_SIZE})")
-    sys.exit(1)
-
 with open(file_path, 'rb') as f:
     if b'\x00' in f.read(8192):
         print("(binary file)")
         sys.exit(0)
 
-with open(file_path, 'r', errors='replace') as f:
-    all_lines = f.readlines()
-
-total = len(all_lines)
 start = max(1, start)
-end = min(end, total) if end is not None else min(total, start + MAX_LINES - 1)
+if end is None:
+    end = start + MAX_LINES - 1
 
-segment_lines = all_lines[start - 1:end]
+with open(file_path, 'r', errors='replace') as f:
+    # Skip lines before start
+    for _ in islice(f, start - 1):
+        pass
+    # Read only the lines we need
+    segment_lines = list(islice(f, end - start + 1))
 
 if not segment_lines:
     print("(empty file)" if start == 1 else "(no lines in range)")