Command-Line Tools Should Be Designed as Reliable APIs for Automation

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Command-line interfaces are often used as programmatic APIs when integrated into scripts, CI/CD pipelines, or connected to other software. This requires CLI tools to provide predictable behavior, clear output contracts, and thoughtful design similar to traditional APIs. Developers should separate machine-readable data from human messages by using stdout for structured results and stderr for diagnostics. Proper exit codes and structured output formats like JSON or CSV are essential for reliable automation, and breaking changes must be communicated intentionally to avoid disrupting dependent systems.

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