Usable now or on first call. A live connection counts, and so does an installed-but-sleeping extension: its service worker wakes on t

gh auth status 非零退出是正常业务态（未登录）：warn 但后端可用。

config xiaohongshu_backend=xhs-cli 时，即使 OpenCLI ready 也用 xhs-cli。

bili 断链 → API 兜底获胜，但重装处方必须保留在消息里。

A stale venv shim: which() finds it, exec raises FileNotFoundError.

Every channel exposes active_backend (default None, or str once set).

After check(), active_backend is None or a str — never anything else.

No twitter-cli, bird found but Missing credentials → warn.

No twitter-cli, but bird found + bird check ok → ok.

Neither twitter-cli nor bird → warn with install hint.

twitter-cli 断链但 bird 健康 → 回退到 bird，后端正确归属。

which 命中但 exec 抛 FileNotFoundError（venv 断链）→ error + 重装处方。

twitter-cli found + twitter status ok → ok.

twitter-cli found + not_authenticated → warn about auth.

_ensure_cookies() should inject cookies from the config file.

_get_json() must send Referer and a browser-like User-Agent.

_install_skill should create agent-reach dir inside existing skill dir.

桌面 → OpenCLI;服务器 → rdt-cli(钉 git 源)。

_install_skill should create SKILL.md in the first available skill dir.

_install_skill should install the English skill file for English locales.

发版窗口期本地装了 main(更新)时,不能提示"有更新"诱导降级。