環境変数
CLAUDE_CODE_ENABLE_FINE_GRAINED_TOOL_STREAMING
APIからのツール実行入力のストリーミングを制御し、大きな入力が生成完了まで届かない（固まったように見える）のを防ぎます。
英語原文(公式ドキュメントより)
Controls whether tool call inputs stream from the API as Claude generates them. With this off, a large tool input such as a long file write arrives only after Claude finishes generating it, which can look like it's hanging. Enabled by default for direct Anthropic API connections. Set to 0 to opt out. Set to 1 to force-enable even when the server-side default is off. Has no effect on Bedrock, Vertex, Foundry, or gateway connections
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