diff --git a/README.md b/README.md
index c0bbc452b6..006af101c5 100644
--- a/README.md
+++ b/README.md
@@ -1612,6 +1612,8 @@ names and base URLs readable.
 
 For `LocalSandboxProvider`, this is a managed tool-path boundary rather than host filesystem isolation. Explicit per-Agent skill policies are accepted only while host bash is disabled (the default), because a host subprocess can address canonical paths without using the provider's virtual-path mappings. Use Docker/AIO, the Kubernetes provisioner, or E2B when the filesystem boundary must remain enforceable alongside shell access.
 
+When the local sandbox uses PowerShell, mapped host-path spaces and shell metacharacters are escaped for the caller's quoting context; wildcard expansion is preserved. The public `bash` tool's existing workspace prefix uses `&&` and POSIX path quoting: it requires PowerShell 7 for that separator and does not support workspace paths containing apostrophes. These workspace-prefix limitations are separate from virtual-path mapping.
+
 On Windows, the local sandbox's `cmd.exe` fallback decodes builtin output using
 the console output code page, including UTF-8 after `chcp 65001`, independently
 of Python's UTF-8 mode. If no console page is available, it uses the system OEM
diff --git a/backend/packages/harness/deerflow/sandbox/AGENTS.md b/backend/packages/harness/deerflow/sandbox/AGENTS.md
index b95ffd7353..a7822c61ae 100644
--- a/backend/packages/harness/deerflow/sandbox/AGENTS.md
+++ b/backend/packages/harness/deerflow/sandbox/AGENTS.md
@@ -2,6 +2,8 @@
 
 Sandbox restore requires a thread ID, even forks.
 
+PowerShell command mapping escapes host-path whitespace/metacharacters for the caller's quote context in both user-data and provider mappings. Preserve wildcards; Bash/cmd mapping stays unchanged. Keep portable string assertions alongside native Windows smoke tests. The public bash tool's existing POSIX-quoted cwd prefix requires PowerShell 7 (`&&`) and workspace paths without apostrophes; mapping does not repair that prefix.
+
 Local `grep` skips non-regular entries before reading. File reads and directory scans propagate errors, except `ENOENT`/`ENOTDIR`/`ELOOP`/`EISDIR`/`ESTALE` races (`ESTALE` when available). Error filenames are reverse-resolved at the local sandbox boundary, including custom mounts; permission errors identify the virtual failing path.
 
 **Network approval policy**: `SandboxMiddleware` uses
diff --git a/backend/packages/harness/deerflow/sandbox/local/local_sandbox.py b/backend/packages/harness/deerflow/sandbox/local/local_sandbox.py
index f4dd9d65b4..446709ed85 100644
--- a/backend/packages/harness/deerflow/sandbox/local/local_sandbox.py
+++ b/backend/packages/harness/deerflow/sandbox/local/local_sandbox.py
@@ -184,6 +184,59 @@ class ResolvedPath(NamedTuple):
     mapping: PathMapping | None
 
 
+_POWERSHELL_QUOTE_TRANSLATION = str.maketrans("\u2018\u2019\u201c\u201d", "''\"\"")
+
+
+def escape_powershell_path(match: re.Match[str], path: str) -> str:
+    """Keep mapped paths literal in the caller's quote context, preserving wildcards."""
+    quote = None
+    escaped = False
+    subexpressions: list[str | None] = []
+    prefix = match.string[: match.start()]
+    index = 0
+    while index < len(prefix):
+        char = prefix[index].translate(_POWERSHELL_QUOTE_TRANSLATION)
+        if escaped:
+            escaped = False
+        elif char == "`" and quote != "'":
+            escaped = True
+        elif quote is None and prefix[index : index + 2] == "<#":
+            end = prefix.find("#>", index + 2)
+            index = len(prefix) if end < 0 else end + 1
+        elif quote is None and char == "#" and (index == 0 or prefix[index - 1].isspace() or prefix[index - 1] in ";|&(){}="):
+            end = prefix.find("\n", index)
+            index = len(prefix) if end < 0 else end
+        elif quote is None and prefix[index : index + 2] in ("@'", '@"'):
+            delimiter = prefix[index + 1]
+            end = re.search(rf"(?m)^{delimiter}@", prefix[index + 2 :])
+            if end is None:
+                if delimiter == "'":
+                    return path
+                quote = '@"'
+                index += 1
+            else:
+                index += end.end() + 1
+        elif char == "$" and prefix[index : index + 2] == "$(" and quote != "'":
+            subexpressions.append(quote)
+            quote = None
+            index += 1
+        elif char in "\"'" and quote in (None, char):
+            quote = None if quote else char
+        elif quote is None and char == "(":
+            subexpressions.append(None)
+        elif quote is None and char == ")" and subexpressions:
+            quote = subexpressions.pop()
+        index += 1
+    # The path matcher includes a caller's closing smart quote in its tail.
+    closing_quote = path[-1:] if quote in ("'", '"') and match.group()[-1:].translate(_POWERSHELL_QUOTE_TRANSLATION) == quote else ""
+    if closing_quote:
+        path = path[:-1]
+    if quote == "'":
+        return re.sub(r"['\u2018\u2019]", lambda char: char.group() * 2, path) + closing_quote
+    characters = r'[`$"\u201c\u201d]' if quote is not None else r"[ \t`$'\";&,()@{}#\u2018\u2019\u201c\u201d]"
+    return re.sub(characters, lambda char: "`" + char.group(), path) + closing_quote
+
+
 class LocalSandbox(Sandbox):
     #: Every call is a fresh ``subprocess.run([shell, "-c", ...])`` process —
     #: no shell state survives into the next command.
@@ -561,12 +614,13 @@ class LocalSandbox(Sandbox):
 
         return result
 
-    def _resolve_paths_in_command(self, command: str) -> str:
+    def _resolve_paths_in_command(self, command: str, *, shell: str | None = None) -> str:
         """
         Resolve container paths to local paths in a command string.
 
         Args:
             command: Command string that may contain container paths
+            shell: Execution shell, or None for unescaped path resolution
 
         Returns:
             Command with container paths resolved to local paths
@@ -583,10 +637,14 @@ class LocalSandbox(Sandbox):
                 # canonicalizing the truncated prefix would follow an
                 # unrelated symlink and reassemble a path to a different
                 # file, so substitute textually there.
-                return self._resolve_path_textually(matched_path).replace("\\", "/")
+                resolved = self._resolve_path_textually(matched_path).replace("\\", "/")
+            else:
+                resolved = self._resolve_path(matched_path).replace("\\", "/")
             # Normalize to forward slashes so bash doesn't interpret Windows
             # backslash sequences (\\U, \\a, \\d, \\s, \\n, \\t) as escapes.
-            return self._resolve_path(matched_path).replace("\\", "/")
+            if self._is_powershell(shell or ""):
+                return escape_powershell_path(match, resolved)
+            return resolved
 
         return pattern.sub(replace_match, command)
 
@@ -683,8 +741,8 @@ class LocalSandbox(Sandbox):
         # any new caller to use safe key names.
         _validate_extra_env(env)
         # Resolve container paths in command before execution
-        resolved_command = self._resolve_paths_in_command(command)
         shell = self._get_shell()
+        resolved_command = self._resolve_paths_in_command(command, shell=shell)
         if timeout is None:
             timeout = DEFAULT_COMMAND_TIMEOUT_SECONDS
 
diff --git a/backend/packages/harness/deerflow/sandbox/tools.py b/backend/packages/harness/deerflow/sandbox/tools.py
index 3aecd2bb9e..8351c7e3bb 100644
--- a/backend/packages/harness/deerflow/sandbox/tools.py
+++ b/backend/packages/harness/deerflow/sandbox/tools.py
@@ -40,6 +40,7 @@ from deerflow.sandbox.lease import (
     sandbox_command_scope,
     sandbox_lease_owner,
 )
+from deerflow.sandbox.local.local_sandbox import LocalSandbox, escape_powershell_path
 from deerflow.sandbox.overwrite import unwrap_sandbox
 from deerflow.sandbox.path_patterns import build_output_mask_pattern, normalize_mask_tail, replace_output_path_matches
 from deerflow.sandbox.prewarm import claim_sandbox_prewarm
@@ -1888,7 +1889,7 @@ def validate_local_bash_command_paths(command: str, thread_data: ThreadDataState
         raise PermissionError(f"Unsafe absolute paths in command: {unsafe}. Use paths under {VIRTUAL_PATH_PREFIX}. {_LOCAL_BASH_PATH_RECOVERY_GUIDANCE}")
 
 
-def replace_virtual_paths_in_command(command: str, thread_data: ThreadDataState | None) -> str:
+def replace_virtual_paths_in_command(command: str, thread_data: ThreadDataState | None, *, shell: str | None = None) -> str:
     """Replace /mnt/user-data virtual paths in a command string for local sandbox.
 
     Skills paths (/mnt/skills) and ACP workspace paths (/mnt/acp-workspace)
@@ -1901,6 +1902,7 @@ def replace_virtual_paths_in_command(command: str, thread_data: ThreadDataState
     Args:
         command: The command string that may contain virtual paths.
         thread_data: The thread data containing actual paths.
+        shell: Local execution shell, auto-detected when omitted.
 
     Returns:
         The command with user-data virtual paths replaced.
@@ -1934,7 +1936,10 @@ def replace_virtual_paths_in_command(command: str, thread_data: ThreadDataState
         pattern = re.compile(rf"{re.escape(VIRTUAL_PATH_PREFIX)}(?=/|$|[^\w./-])(/[^\s\"';&|<>():]*)?")
 
         def replace_user_data_match(match: re.Match) -> str:
-            return replace_virtual_path(match.group(0), thread_data).replace("\\", "/")
+            resolved = replace_virtual_path(match.group(0), thread_data).replace("\\", "/")
+            if LocalSandbox._is_powershell(shell or LocalSandbox._get_shell()):
+                return escape_powershell_path(match, resolved)
+            return resolved
 
         result = pattern.sub(replace_user_data_match, result)
 
diff --git a/backend/tests/test_local_command_path_spaces.py b/backend/tests/test_local_command_path_spaces.py
new file mode 100644
index 0000000000..a7f1988bf5
--- /dev/null
+++ b/backend/tests/test_local_command_path_spaces.py
@@ -0,0 +1,209 @@
+"""Mapped host-directory spaces must not split PowerShell path arguments."""
+
+import os
+import shutil
+from pathlib import Path
+from types import SimpleNamespace
+
+import pytest
+
+from deerflow.sandbox.local.local_sandbox import LocalSandbox, PathMapping
+from deerflow.sandbox.tools import bash_tool, replace_virtual_paths_in_command
+
+
+@pytest.fixture
+def powershell(monkeypatch):
+    if os.name != "nt":
+        pytest.skip("native Windows PowerShell execution")
+    shell = shutil.which("pwsh") or shutil.which("powershell")
+    if shell is None:
+        pytest.skip("PowerShell is not installed")
+    monkeypatch.setattr(LocalSandbox, "_get_shell", staticmethod(lambda: shell))
+    return shell
+
+
+@pytest.fixture
+def mounted(tmp_path):
+    root = tmp_path / "host directory with spaces"
+    root.mkdir()
+    (root / "marker.txt").write_text("needle", encoding="utf-8")
+    (root / "other.md").write_text("other", encoding="utf-8")
+    return LocalSandbox("local", [PathMapping("/mnt/data", str(root))]), root
+
+
+@pytest.mark.parametrize(
+    "command",
+    [
+        "Get-Content /mnt/data/marker.txt",
+        'Get-Content "/mnt/data/marker.txt"',
+        "Get-Content '/mnt/data/marker.txt'",
+        "Get-Content \u2018/mnt/data/marker.txt\u2019",
+        "Get-Content \u201c/mnt/data/marker.txt\u201d",
+        "Get-Content /mnt/data/*.txt",
+        "Get-Content /mnt/data/marker.txt | Write-Output",
+        "Write-Output ignored; Get-Content /mnt/data/marker.txt",
+        "Write-Output /mnt/data/marker.txt",
+        "Write-Output --file=/mnt/data/marker.txt",
+        'Write-Output "$(Get-Content /mnt/data/marker.txt)"',
+        "# it's a directory\nGet-Content /mnt/data/marker.txt",
+        "Write-Output before;# it's text\nGet-Content '/mnt/data/marker.txt'",
+        "<# it's a directory #> Get-Content /mnt/data/marker.txt",
+        "Write-Output @'\nit's text\n'@\nGet-Content /mnt/data/marker.txt",
+        'Write-Output @"\ntext with "quotes"\n"@\nGet-Content /mnt/data/marker.txt',
+        'Write-Output @"\n$(Get-Content /mnt/data/marker.txt)\n"@',
+        'Write-Output `"quoted; Get-Content /mnt/data/marker.txt',
+        'Get-Content "/mnt/data/marker.txt"; Get-Content /mnt/data/marker.txt',
+    ],
+)
+def test_powershell_executes_mapped_path_with_spaces(powershell, mounted, command):
+    sandbox, _ = mounted
+    output = sandbox.execute_command(command)
+    expected = "/mnt/data/marker.txt" if command.startswith("Write-Output /") or "--file=" in command else "needle"
+    assert expected in output
+    assert "Exit Code:" not in output
+
+
+@pytest.mark.parametrize("shell", ["sh", "cmd.exe"])
+def test_other_shell_path_resolution_is_unchanged(mounted, shell):
+    sandbox, root = mounted
+    command = 'echo /mnt/data/marker.txt "/mnt/data/*.txt"'
+    expected = command.replace("/mnt/data", str(root.resolve()).replace("\\", "/"))
+    assert sandbox._resolve_paths_in_command(command, shell=shell) == expected
+
+
+@pytest.mark.parametrize("layer", ["provider", "thread"])
+@pytest.mark.parametrize(
+    "command,expected",
+    [
+        ("Get-Content {virtual}/marker.txt", "Get-Content {escaped}/marker.txt"),
+        ('Get-Content "{virtual}/marker.txt"', 'Get-Content "{raw}/marker.txt"'),
+        ("Get-Content '{virtual}/marker.txt'", "Get-Content '{raw}/marker.txt'"),
+        ("Get-Content \u2018{virtual}/marker.txt\u2019", "Get-Content \u2018{raw}/marker.txt\u2019"),
+        ("Get-Content \u201c{virtual}/marker.txt\u201d", "Get-Content \u201c{raw}/marker.txt\u201d"),
+        ('Write-Output "$(Get-Content {virtual}/marker.txt)"', 'Write-Output "$(Get-Content {escaped}/marker.txt)"'),
+        ("# it's text\nGet-Content {virtual}/marker.txt", "# it's text\nGet-Content {escaped}/marker.txt"),
+        ("<# it's text #> Get-Content {virtual}/*.txt", "<# it's text #> Get-Content {escaped}/*.txt"),
+        ('Get-Content "{virtual}/marker.txt"; Get-Content {virtual}/*.txt', 'Get-Content "{raw}/marker.txt"; Get-Content {escaped}/*.txt'),
+        ('Write-Output @"\n$(Get-Content {virtual}/marker.txt)\n"@', 'Write-Output @"\n$(Get-Content {escaped}/marker.txt)\n"@'),
+    ],
+)
+def test_powershell_command_mapping_is_portable(mounted, layer, command, expected):
+    sandbox, root = mounted
+    virtual = "/mnt/data" if layer == "provider" else "/mnt/user-data/uploads"
+    raw = str(root.resolve()).replace("\\", "/")
+    command = command.format(virtual=virtual)
+    if layer == "provider":
+        result = sandbox._resolve_paths_in_command(command, shell="pwsh")
+    else:
+        result = replace_virtual_paths_in_command(command, {"uploads_path": str(root)}, shell="pwsh")
+    assert result == expected.format(raw=raw, escaped=raw.replace(" ", "` "))
+
+
+@pytest.mark.parametrize("layer", ["provider", "thread"])
+@pytest.mark.parametrize(
+    "directory,escaped",
+    [
+        ("O'Brien", "O`'Brien"),
+        ("Tom & Jerry", "Tom` `&` Jerry"),
+        ("a;b", "a`;b"),
+        ("a`b", "a``b"),
+        ("cost$USER", "cost`$USER"),
+        ("a(b)", "a`(b`)"),
+        ("a,b", "a`,b"),
+        ("a{b}", "a`{b`}"),
+        ("a\u2019b", "a`\u2019b"),
+        ("a\u201db", "a`\u201db"),
+        ("O'Brien's Folder", "O`'Brien`'s` Folder"),
+    ],
+)
+def test_powershell_mapped_metacharacters_are_literal(tmp_path, layer, directory, escaped):
+    root = tmp_path / directory
+    root.mkdir()
+    virtual = "/mnt/data" if layer == "provider" else "/mnt/user-data/uploads"
+    command = f"Get-Content {virtual}/marker.txt"
+    if layer == "provider":
+        result = LocalSandbox("local", [PathMapping(virtual, str(root))])._resolve_paths_in_command(command, shell="pwsh")
+    else:
+        result = replace_virtual_paths_in_command(command, {"uploads_path": str(root)}, shell="pwsh")
+    parent = str(tmp_path.resolve()).replace("\\", "/").replace(" ", "` ")
+    assert result == f"Get-Content {parent}/{escaped}/marker.txt"
+
+
+@pytest.mark.parametrize("layer", ["provider", "thread"])
+@pytest.mark.parametrize(
+    "directory,quote,escaped",
+    [
+        ("O'Brien", "'", "O''Brien"),
+        ("a`b", '"', "a``b"),
+        ("cost$USER", '"', "cost`$USER"),
+        ("a\u2019b", "'", "a\u2019\u2019b"),
+        ("a\u201db", '"', "a`\u201db"),
+    ],
+)
+def test_quoted_powershell_mapped_metacharacters_are_literal(tmp_path, layer, directory, quote, escaped):
+    root = tmp_path / directory
+    root.mkdir()
+    virtual = "/mnt/data" if layer == "provider" else "/mnt/user-data/uploads"
+    command = f"Get-Content {quote}{virtual}/marker.txt{quote}"
+    if layer == "provider":
+        result = LocalSandbox("local", [PathMapping(virtual, str(root))])._resolve_paths_in_command(command, shell="pwsh")
+    else:
+        result = replace_virtual_paths_in_command(command, {"uploads_path": str(root)}, shell="pwsh")
+    parent = str(tmp_path.resolve()).replace("\\", "/")
+    assert result == f"Get-Content {quote}{parent}/{escaped}/marker.txt{quote}"
+
+
+@pytest.mark.parametrize("directory", ["O'Brien", "O'Brien's Folder", "Tom & Jerry", "a;b", "a`b", "cost$USER", "a(b)", "a,b", "a{b}", "a\u2019b", "a\u201db", "a;Write-Output unexpected;#"])
+@pytest.mark.parametrize("quote", ["", '"', "'"])
+def test_powershell_executes_mapped_metacharacters(powershell, tmp_path, directory, quote):
+    root = tmp_path / directory
+    root.mkdir()
+    (root / "marker.txt").write_text("needle", encoding="utf-8")
+    sandbox = LocalSandbox("local", [PathMapping("/mnt/data", str(root))])
+    output = sandbox.execute_command(f"Get-Content {quote}/mnt/data/marker.txt{quote}")
+    assert "needle" in output, output
+    assert "Exit Code:" not in output, output
+
+
+@pytest.mark.parametrize("shell_name", ["sh", "cmd.exe"])
+def test_quoted_paths_still_execute_in_other_shells(mounted, monkeypatch, shell_name):
+    shell = shutil.which(shell_name)
+    if shell is None or (os.name == "nt" and shell_name == "sh"):
+        pytest.skip(f"native {shell_name} is unavailable")
+    monkeypatch.setattr(LocalSandbox, "_get_shell", staticmethod(lambda: shell))
+    sandbox, _ = mounted
+    command = 'echo "/mnt/data/marker.txt"' if shell_name == "cmd.exe" else 'cat "/mnt/data/marker.txt"'
+    expected = "/mnt/data/marker.txt" if shell_name == "cmd.exe" else "needle"
+    output = sandbox.execute_command(command)
+    assert expected in output
+    assert "Exit Code:" not in output
+
+
+def test_powershell_redirects_to_mapped_path_with_spaces(powershell, mounted):
+    sandbox, root = mounted
+    output = sandbox.execute_command("Write-Output saved > /mnt/data/saved.txt; Get-Content /mnt/data/saved.txt")
+    assert "saved" in output
+    data = (root / "saved.txt").read_bytes()
+    assert "saved" in data.decode("utf-16" if data.startswith(b"\xff\xfe") else "utf-8")
+    assert "Exit Code:" not in output
+
+
+@pytest.mark.parametrize("quote", ["", '"', "'"])
+@pytest.mark.parametrize("upload_directory", ["thread data", "O'Brien", "cost$USER", "a;b"])
+def test_public_bash_tool_preserves_thread_path_argument(powershell, tmp_path, monkeypatch, quote, upload_directory):
+    from deerflow.config.sandbox_config import SandboxConfig
+
+    dirs = {f"{name}_path": str(tmp_path / "thread data" / name) for name in ("workspace", "uploads", "outputs")}
+    dirs["uploads_path"] = str(tmp_path / upload_directory / "uploads")
+    for directory in dirs.values():
+        Path(directory).mkdir(parents=True)
+    Path(dirs["uploads_path"], "marker.txt").write_text("needle", encoding="utf-8")
+    sandbox = LocalSandbox("local", [PathMapping(f"/mnt/user-data/{name}", dirs[f"{name}_path"]) for name in ("workspace", "uploads", "outputs")])
+    runtime = SimpleNamespace(state={"sandbox": {"sandbox_id": "local"}, "thread_data": dirs}, context={"thread_id": "space-test"})
+    monkeypatch.setattr("deerflow.sandbox.tools.ensure_sandbox_initialized", lambda _: sandbox)
+    monkeypatch.setattr("deerflow.sandbox.tools.is_host_bash_allowed", lambda: True)
+    monkeypatch.setattr("deerflow.sandbox.tools.get_app_config", lambda: SimpleNamespace(sandbox=SandboxConfig()))
+    result = bash_tool.func(runtime=runtime, command=f"Get-Content {quote}/mnt/user-data/uploads/marker.txt{quote}")
+    assert "needle" in result
+    assert "Exit Code:" not in result
+    assert not result.startswith("Error:"), result