tmux_server:status/1

Endpoint resource summary. owner is the supervised endpoint process, not its initiating caller. operations and command_bytes count active admission leases; active_bytes reserves output capacity. Retired results are bounded separately by retained_results and result_bytes. These are accounting limits, not VM heap measurements. generation identifies this endpoint handle's lifetime.

A tagged error detail with a stable code and optional certainty/output data. Validation, admission and wait errors may contain only code. Command failures retain available stdout/stderr, stdin_delivered and exit_status. Other keys provide code-specific context. Never infer missing certainty fields.