Log into WeChat. If a session is already saved (persisted across restarts), this returns silently. Otherwise it triggers a QR code flow: the PNG is auto-opened on the user's screen and an ASCII copy is saved to ~/.wechatbot/mcp/qr-latest.txt. Returns the account id on success.

Stop the bot. With clearCredentials=true, also deletes ~/.wechatbot/credentials so the next login() will require a fresh QR.

Connection state, account info, receive-queue depth.

Send a plain text message to a userId (must be a known user).

Send a local image file. Caption is sent as a separate text message before the image.

Send an arbitrary local file (auto-detected as image / video / file).

Send media from a remote URL. SDK downloads it and uploads to WeChat CDN.

Show "对方正在输入中…" once. Does not auto-stop — pair with wechat_stop_typing.

Cancel the typing indicator for the given user.

Pop and return up to limit received WeChat messages that have been buffered since the last call. Media files (image/file/video/voice) are auto-downloaded to ~/.wechatbot/pending-media/ and referenced by localPath in the response.

List user IDs we currently have a context_token for (i.e., who can be messaged back).