Individual skill

go-cli-command-design

Design and review predictable Go command-line interfaces with canonical names and flags; explicit inputs and precedence; human, plain, and structured output; safe prompting; stdout and stderr contracts; help; errors; exit codes; cancellation; dependency injection; and platform behavior. Use when creating a Go CLI, changing its public command contract, making command code testable, or reviewing compatibility for people, scripts, AI agents, and CI.

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# Go CLI Command Design

Design the command as a public interface before treating it as an implementation.
Keep results pipeable, failures diagnosable, and process-global state at the edge.

## Core Workflow

1. State the command purpose, invocation syntax, callers, and compatibility promises.
2. Assign each input to a flag, operand, stdin, environment, or config source.
3. Define precedence, validation, conflicts, defaults, and blocking behavior.
4. Reserve stdout for results and requested help; use stderr for diagnostics,
   invalid-usage help, and progress.
5. Return errors from command logic and map exit codes at the process boundary.
6. Inject streams, configuration, and effects behind a small testable runner.