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Fix Windows subprocess CLI detection (WinError 193) #253

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Fix Windows subprocess CLI detection (WinError 193) #253

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29 changes: 21 additions & 8 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 @@ -60,16 +60,29 @@ def __init__(

def _find_cli(self) -> str:
"""Find Claude Code CLI binary."""
if cli := shutil.which("claude"):
# On Windows, npm creates both 'claude' (bash script) and 'claude.cmd' (batch file)
# We need to use 'claude.cmd' for proper execution on Windows
search_name = "claude.cmd" if sys.platform == "win32" else "claude"

if cli := shutil.which(search_name):
return cli

locations = [
Path.home() / ".npm-global/bin/claude",
Path("/usr/local/bin/claude"),
Path.home() / ".local/bin/claude",
Path.home() / "node_modules/.bin/claude",
Path.home() / ".yarn/bin/claude",
]
# Fallback locations to check manually
if sys.platform == "win32":
locations = [
Path.home() / "AppData/Roaming/npm/claude.cmd",
Path.home() / ".npm-global/bin/claude.cmd",
Path.home() / "node_modules/.bin/claude.cmd",
Path.home() / ".yarn/bin/claude.cmd",
]
else:
locations = [
Path.home() / ".npm-global/bin/claude",
Path("/usr/local/bin/claude"),
Path.home() / ".local/bin/claude",
Path.home() / "node_modules/.bin/claude",
Path.home() / ".yarn/bin/claude",
]

for path in locations:
if path.exists() and path.is_file():
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