exitcode

const (
	OK           = 0 // success
	Error        = 1 // generic failure
	Usage        = 2 // invalid usage: bad flags, bad input, not-yet-implemented
	AuthRequired = 3 // no credentials, or credentials rejected
	NotFound     = 4 // requested entity does not exist (or is not visible)
	Conflict     = 5 // state conflict, e.g. duplicate install
	Cancelled    = 6 // interrupted or timed out waiting for the user
	// Unavailable (#394) is the one failure the server never refused: the
	// request did not reach it, or its answer did not reach us — a gateway
	// 5xx, a reset connection, a timeout. Separated from Error because it is
	// the only class that is safe to retry blind, AND the only one after
	// which a mutation's outcome is genuinely unknown. A script branching on
	// 1 vs 7 is branching on "the server refused this" vs "ask again".
	Unavailable = 7
	// Forbidden (#619) is AUTHENTICATED BUT NOT PERMITTED — the server knows
	// who you are and will not let you do this.
	//
	// It is NOT AuthRequired, and that distinction is the whole reason it
	// exists. 3 means "no credentials, or credentials rejected", whose remedy
	// is `hadron auth login`; printing that at someone already signed in is a
	// false remedy, and the CLI has shipped one of those before (#626, where
	// `whoami` told a rejected token it had no sessions and an App key to log
	// in). Nor is it Error: 1 is "something failed", which leaves an agent
	// unable to tell a permission boundary from a bug or an outage.
	//
	// The class is large and growing. FORBIDDEN is named at 23 sites in the
	// SDL today and already arrives at the CLI; hadron-server#1220 migrates
	// ~59 more call sites onto it, 17 of them inside seven shared gates. Every
	// one of those reached a script as 1 before this.
	//
	// A script branching on 3 vs 8 is branching on "sign in" vs "ask someone
	// for access" — two different humans and two different next actions.
	Forbidden = 8
)