diff --git a/README.md b/README.md
index a6f7820b08..b4def05531 100644
--- a/README.md
+++ b/README.md
@@ -2073,6 +2073,7 @@ Each task gets its own execution environment with a full filesystem view — ski
 The read-before-write gate ties each read mark to that `read_file` call's result, including custom tools returning multi-message `Command` updates. An unrelated result cannot authorize a write after a failed read or hide a successful read.
 
 The built-in `grep` tool searches either one text file or all matching text files below a directory, so an agent can search an uploaded document directly without first broadening the request to the entire uploads directory.
+E2B's `glob` filter preserves spaces, quotes, and dollar signs in filename patterns, while wildcard matching and root-relative directory scoping remain unchanged.
 
 Remote `ls` excludes ignored descendants before applying its 500-entry listing limit, so dependency and build trees do not crowd out visible files. Explicitly listing an ignored directory still lists its contents; normal depth and output limits remain in effect.
 
diff --git a/backend/packages/harness/deerflow/community/e2b_sandbox/AGENTS.md b/backend/packages/harness/deerflow/community/e2b_sandbox/AGENTS.md
index 870860ea47..a1cf2be2e6 100644
--- a/backend/packages/harness/deerflow/community/e2b_sandbox/AGENTS.md
+++ b/backend/packages/harness/deerflow/community/e2b_sandbox/AGENTS.md
@@ -36,3 +36,11 @@ That fence covers cached sync/async acquisition too: recheck after serializer
 waits and immediately before exposing a reused client. Signal-triggered shutdown
 may report deferred cleanup, but it must still forward the process's original
 SIGTERM/SIGINT/SIGHUP action while retaining the pending E2B state.
+
+## File search
+
+Quote the complete `grep --include=<pattern>` argument with `shlex.quote` before
+passing it to the shell. The shell must not split or expand filename patterns;
+grep owns basename globbing and `path_matches` owns root-relative directory
+scoping. `tests/test_sandbox_search_contract.py` pins this across providers using
+real temporary files and offline shell transports.
diff --git a/backend/packages/harness/deerflow/community/e2b_sandbox/e2b_sandbox.py b/backend/packages/harness/deerflow/community/e2b_sandbox/e2b_sandbox.py
index e12024f952..426ef2bae1 100644
--- a/backend/packages/harness/deerflow/community/e2b_sandbox/e2b_sandbox.py
+++ b/backend/packages/harness/deerflow/community/e2b_sandbox/e2b_sandbox.py
@@ -493,7 +493,7 @@ class E2BSandbox(Sandbox):
             # pattern) and enforce the real directory scope below via
             # ``path_matches``, the same helper ``glob()`` uses.
             include_pattern = glob.split("/")[-1] or glob
-            flags.append(f"--include={include_pattern}")
+            flags.append(shlex.quote(f"--include={include_pattern}"))
 
         per_file_cap = max(max_results + 1, 50)
         total_cap = max(max_results * 4, max_results + 50)
diff --git a/backend/tests/test_sandbox_search_contract.py b/backend/tests/test_sandbox_search_contract.py
index 52324701b1..80b668ad90 100644
--- a/backend/tests/test_sandbox_search_contract.py
+++ b/backend/tests/test_sandbox_search_contract.py
@@ -241,6 +241,32 @@ def test_grep_glob_filter_is_root_relative(provider, tree):
     assert truncated is False
 
 
+@pytest.mark.parametrize(
+    ("filename", "glob"),
+    [
+        ("release notes.txt", "release *.txt"),
+        ("author's-notes.txt", "author's-*.txt"),
+        ('release"notes.txt', 'release"*.txt'),
+        ("price$USD.txt", "price$USD.txt"),
+        ("report1.txt", "report[0-9].txt"),
+        ("plain.txt", "*.txt"),
+    ],
+    ids=["space", "single-quote", "double-quote", "dollar", "character-range", "wildcard"],
+)
+def test_grep_glob_preserves_filename_characters(provider, tmp_path, filename, glob):
+    root = tmp_path / "workspace"
+    for directory in (root / "docs", root / "other", root / "docs" / "nested"):
+        directory.mkdir(parents=True)
+        (directory / filename).write_text("header\nneedle\n", encoding="utf-8")
+    (root / "docs" / "excluded.md").write_text("needle\n", encoding="utf-8")
+    provider.transport.env["USD"] = "expanded"
+
+    matches, truncated = provider.sandbox.grep(str(root), "needle", glob=f"docs/{glob}")
+
+    assert [(match.path, match.line_number, match.line) for match in matches] == [(str(root / "docs" / filename), 2, "needle")]
+    assert truncated is False
+
+
 def test_no_match_is_empty_and_complete(provider, tree):
     assert provider.sandbox.glob(str(tree), "**/*.missing") == ([], False)
     assert provider.sandbox.grep(str(tree), "absentneedle") == ([], False)