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Hide subprocess terminal window on Windows #489

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Hide subprocess terminal window on Windows #489

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10 changes: 10 additions & 0 deletions src/claude_agent_sdk/_internal/transport/subprocess_cli.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@
import platform
import re
import shutil
import subprocess
import sys
import tempfile
from collections.abc import AsyncIterable, AsyncIterator
Expand Down Expand Up @@ -36,6 +37,13 @@
# Other platforms have much higher limits
_CMD_LENGTH_LIMIT = 8000 if platform.system() == "Windows" else 100000

# Platform-specific process creation flags
# On Windows, CREATE_NO_WINDOW prevents a visible console window from appearing
# when spawning the CLI subprocess, which improves UX for GUI applications
_CREATION_FLAGS = (
subprocess.CREATE_NO_WINDOW if sys.platform == "win32" and hasattr(subprocess, "CREATE_NO_WINDOW") else 0
)


class SubprocessCLITransport(Transport):
"""Subprocess transport using Claude Code CLI."""
Expand Down Expand Up @@ -408,6 +416,7 @@ async def connect(self) -> None:
cwd=self._cwd,
env=process_env,
user=self._options.user,
creationflags=_CREATION_FLAGS,
)

if self._process.stdout:
Expand Down Expand Up @@ -636,6 +645,7 @@ async def _check_claude_version(self) -> None:
[self._cli_path, "-v"],
stdout=PIPE,
stderr=PIPE,
creationflags=_CREATION_FLAGS,
)

if version_process.stdout:
Expand Down
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