diff --git a/pyproject.toml b/pyproject.toml
index 69abfbf..45544eb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -73,6 +73,9 @@ Issues = "https://github.com/microsoft/SkillOpt/issues"
 # skillopt_webui = the Gradio dashboard (installed via the `webui` extra)
 include = ["skillopt", "skillopt.*", "skillopt_sleep", "skillopt_sleep.*", "skillopt_webui", "skillopt_webui.*", "scripts*"]
 
+[tool.setuptools.package-data]
+"*" = ["*.md"]
+
 [tool.ruff]
 line-length = 120
 target-version = "py310"
diff --git a/skillopt/model/claude_backend.py b/skillopt/model/claude_backend.py
index b2d0e94..75020b1 100644
--- a/skillopt/model/claude_backend.py
+++ b/skillopt/model/claude_backend.py
@@ -243,7 +243,11 @@ def _assistant_message_schema_wrapper() -> str:
 
 def _run_claude_print(*, system: str, prompt: str, model: str, tools: list[dict[str, Any]] | None, tool_choice: str | dict[str, Any] | None, return_message: bool, timeout: int | None, attachments: list[dict[str, Any]] | None = None) -> tuple[str, dict[str, Any], dict[str, int]]:
     effort = _normalize_reasoning_effort(REASONING_EFFORT)
-    with tempfile.TemporaryDirectory(prefix="skillopt_claude_") as temp_dir:
+    # Use mkdtemp + manual rmtree to avoid WinError 32 on Windows
+    # where the spawned claude/node subprocess still holds a handle
+    # to the temp directory when the context manager tries to clean up.
+    temp_dir = tempfile.mkdtemp(prefix="skillopt_claude_")
+    try:
         copied_attachments = _copy_attachments_to_temp(attachments or [], temp_dir)
         prompt_for_cli = _append_attachment_instructions(prompt, copied_attachments)
         cmd = [CLAUDE_BIN, "-p", "--output-format", "json", "--permission-mode", CLAUDE_PERMISSION_MODE, "--add-dir", temp_dir]
@@ -287,6 +291,8 @@ def _run_claude_print(*, system: str, prompt: str, model: str, tools: list[dict[
         raw_text, result_event = _extract_result(stream)
         usage_info = _usage_from_result(result_event)
         return raw_text, result_event or {}, usage_info
+    finally:
+        shutil.rmtree(temp_dir, ignore_errors=True)
 
 
 def _compat_message_from_payload(payload: Any) -> CompatAssistantMessage: