| `lotusCallState=true` | Stream call state to the host: `io.lotus.call_state` (participants, speaking, mute) and `io.lotus.mic_level`. |
| `lotusTheme=true` | Apply the host theme; the frame's root `color-scheme` follows it. |
| `lotusTransparent=true` | Transparent canvas so the host's wallpaper shows through. Only meaningful with `lotusTheme` (the fork applies it anyway and warns). |
| `lotusHostControls=true` | The host draws the call bar: hide Element Call's footer and enable the host-control actions. |
| `lotusFrameScreenshare=true` | With `lotusHostControls`: show the frame's own screenshare button, for engines without Capability Delegation (Firefox, Safari) where the host can't start a share. |
| `io.lotus.call_state` | call → host | in-call per-participant speaking / mute state. NOTE: matrix-widget-api `transport.send` is request/response — the host MUST register a handler that replies/acks each one (cinny's `listenAction` does, replying `{}`). If the host has no handler, ClientWidgetApi immediately error-replies "unsupported from-widget action", so the data is silently dropped and each throttled send rejects (caught) — functional miss + log churn, not a hang. | yes |
| `io.lotus.focus_participant` | host → call | pin/spotlight (or clear, with userId=null) a participant. | yes |
| `io.lotus.inject_audio` | host → call | play an audio clip into the call as a separate published track. | yes |
| `io.lotus.request_state` | call → host | sent on (re)registration of a lotus toWidget handler (e.g. decorations) so the host can re-push state that would otherwise only be sent on change (decorations roster, the current focus pin) after an EC-side reconnect/remount. cinny's `resendForkState()` should respond to this the same way it responds to a fresh join. | yes |
| `io.lotus.denoise_state` | call → host | real state of the in-source denoise engine — `{ active: boolean, model: string, error?: string }` — sent once the processor attaches (or after the rnnoise fallback also fails), so the host toggle can reflect reality rather than the requested state. | yes |
| `io.lotus.screenshare_notice` | call → host | local screenshare reminder `{ kind: "ended" \| "no-frames" \| "alone" }` — window closed, no frames for 15 s, or 30 min of sharing with nobody else in the call (#39). Each fires at most once per share. | yes |
| `io.lotus.open_settings` | host → call | open EC's settings modal, or close it with `{ open: false }`; omit `open` to toggle (cinny #43). | yes |
| `io.lotus.toggle_reactions` | host → call | toggle the reactions / raise-hand menu (cinny #43). | yes |
| `io.lotus.set_screenshare` | host → call | start/stop sharing `{ on?: boolean }` (omit to toggle; cinny #43). Starting calls getDisplayMedia, which needs the user's click: the host sends this with Capability Delegation (`delegate: "display-capture"`), and without it the browser rejects the share. | yes |
| `io.lotus.set_hotkeys` | host → call | `{ codes: string[] }` — KeyboardEvent.code values (PTT, deafen) to report while focus is inside this frame (cinny #43). `[]` stops. | yes |
| `io.lotus.set_frame_screenshare` | host → call | `{ visible: boolean }` — whether the in-frame screenshare button (`lotusFrameScreenshare`) may show, e.g. false while the room's call policy forbids screensharing (cinny #43). Defaults to visible. | yes |
| `io.lotus.prompt_screenshare` | host → call | `{}` — show the "Share your screen?" prompt inside this frame (cinny #43). For hosts that can't delegate the user's click: the prompt's Share button is clicked here, so getDisplayMedia gets its activation. | yes |
| `io.lotus.hotkey` | call → host | a watched key went down/up here, or this window's focus changed; see `LotusHotkeyReport` (cinny #43). | yes |
| `io.lotus.controls_state` | call → host | `{ screensharing: boolean, layout: "grid" \| "spotlight" \| null, screenshareAction: true, hotkeys: true, frameScreenshare: false, screensharePrompt: boolean, screensharePromptOpen: boolean }` whenever either changes (cinny #43), so the host stops reading EC's DOM for them. Its arrival also tells the host this fork supports the actions above. | yes |
| `io.lotus.mic_level` | call → host | local mic level `{ bars: 0 \| 1 \| 2 \| 3 }` (cinny #146), sent only when it changes (≤ 10 Hz); 0 while muted or with no mic. | yes |
| `io.lotus.call_error` | call → host | the call's error page is up (`{ code, recoverable }`) or cleared (`{ code: null }`) (cinny #318), so the host stops showing the call as joined after "Connection lost". | cinny #418 |
