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fix: preserve thinking=disabled as --thinking-disabled flag #699

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fix: preserve thinking=disabled as --thinking-disabled flag #699

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2 changes: 1 addition & 1 deletion 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 @@ -308,7 +308,7 @@ def _build_command(self) -> list[str]:
elif t["type"] == "enabled":
resolved_max_thinking_tokens = t["budget_tokens"]
elif t["type"] == "disabled":
resolved_max_thinking_tokens = 0
cmd.append("--thinking-disabled")
if resolved_max_thinking_tokens is not None:
cmd.extend(["--max-thinking-tokens", str(resolved_max_thinking_tokens)])

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11 changes: 11 additions & 0 deletions tests/test_transport.py
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Original file line number Diff line number Diff line change
Expand Up @@ -160,6 +160,17 @@ def test_build_command_with_max_thinking_tokens(self):
assert "--max-thinking-tokens" in cmd
assert "5000" in cmd

def test_build_command_with_thinking_disabled(self):
"""Test that thinking=disabled sends --thinking-disabled flag, not --max-thinking-tokens 0."""
transport = SubprocessCLITransport(
prompt="test",
options=make_options(thinking={"type": "disabled"}),
)

cmd = transport._build_command()
assert "--thinking-disabled" in cmd
assert "--max-thinking-tokens" not in cmd

def test_build_command_with_add_dirs(self):
"""Test building CLI command with add_dirs option."""
from pathlib import Path
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