[pull] trunk from cli:trunk - #325
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When an agent misuses a command, the terse usage string does not carry the examples, JSON fields or environment variables it needs to correct itself, forcing a second `--help` invocation. Extract the help renderer out of rootHelpFunc so it can target any writer, then use it from printError when an agent is detected. Rendering directly to stderr avoids cmd.Help(), which writes to stdout and would otherwise split a single failure across two streams. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
A user-defined alias is a stub command: its own help carries no flags or examples, only "Alias for ...". NewCmdRoot works around this by pointing the alias's usage and help funcs at the command it expands to, but printError calls root.WriteHelp directly and so bypassed that redirection. The result was that agents got strictly worse output than humans for aliases: `gh prs --badFlag` rendered 384 bytes of alias stub with none of `pr list`'s flags, leaving the agent no way to correct itself. Resolve the alias inside WriteHelp so the behaviour cannot be missed by a future call site. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: d6afb36c-b3b5-472f-b540-025e38395b79
Print full help on command misuse for invoking agents
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