# muse.ai Message DOM Map

Reference for automation against the muse.ai chat UI. Captured live via CDP
on the `opm` headless browser (viewport 780×493), 2026-10-04 ~03:45 UTC.
Verified states: main chat (`https://muse.ai/`) and empty new thread
(`https://muse.ai/thread/new`).

Related maps: sidechat panel selectors live in the sidechat work
(`hatch-chat-switcher-trigger`, `hatch-chat-compose`); this doc covers the
message composer, send button, message list, and chat activation.

---

## 1. Message input area

### Primary selector

```js
document.querySelector('textarea[aria-label="Message"]')
```

Fallback chain used by `muse-chat-api.py` (any one may match depending on render):

```js
document.querySelector('[contenteditable="true"]')
  || document.querySelector('textarea[placeholder*="Message"]')
  || document.querySelector('div[role="textbox"]')
```

### Observed attributes (main chat)

| Attribute     | Value                                                        |
|---------------|--------------------------------------------------------------|
| tag           | `TEXTAREA`                                                   |
| `aria-label`  | `Message`                                                    |
| `placeholder` | `Message`                                                    |
| `rows`        | `1`                                                          |
| `disabled`    | `false`                                                      |
| `readOnly`    | `false`                                                      |
| class         | `text-text-primary block max-h-48 w-full resize-none bg-transparent` |
| visible       | `offsetParent !== null` → `true`                             |

### Parent chain (4 levels)

```
textarea[aria-label="Message"]
└── div.relative.flex.min-h-8.min-w-0.items-center.ps-10        (also contains an <input> and a <div> sibling)
    └── div.flex.shrink-0.flex-col.px-3.py-3
        └── div[role="button"].backdrop-blur-elevation-01.bg-fill-blur-thick.shadow-blur-elevation-01.rounded-32   ← composer "pill"
            └── div.min-w-0.flex-1
```

### Ready-for-typing detection

```js
const ta = document.querySelector('textarea[aria-label="Message"]');
const ready = !!ta && ta.offsetParent !== null && !ta.disabled && !ta.readOnly;
```

Empty-state signal: the placeholder overlay is visible when nothing is typed:

```js
document.querySelector('[data-testid="hatch-composer-placeholder-overlay"]')
// → <span> innerText "Message", visible when input is empty
```

### Typing into it (React-safe)

`execCommand('insertText')` is what the current tooling uses:

```js
const input = document.querySelector('textarea[aria-label="Message"]');
input.focus();
document.execCommand('insertText', false, message);
```

Alternative when React ignores execCommand — native setter + input event:

```js
const setter = Object.getOwnPropertyDescriptor(window.HTMLTextAreaElement.prototype, 'value').set;
setter.call(ta, text);
ta.dispatchEvent(new Event('input', { bubbles: true }));
```

Adjacent composer buttons (same pill, not the send button):

| `aria-label`        | Purpose        |
|---------------------|----------------|
| `Attach file`       | file upload    |
| `Dictate a message` | voice input    |

---

## 2. Send button

### Selector

```js
[...document.querySelectorAll('button')]
  .find(b => b.getAttribute('aria-label')?.toLowerCase().includes('send'))
// observed aria-label is exactly "Send"
```

- Icon: inline SVG, arrow-up glyph (path data starts `M11.45 2.32`).
- No `data-testid`, no `title`, no innerText — match on `aria-label` only.

### Enabled / disabled states

- Observed `disabled === false` in the DOM even with an empty composer; the
  button is **rendered once text is typed** and may persist afterwards.
- Do not rely on `disabled` alone. Practical send flow (as implemented):

```js
const send = [...document.querySelectorAll('button')]
  .find(b => b.getAttribute('aria-label')?.toLowerCase().includes('send'));
if (send) { send.click(); /* 'sent' */ }
else {
  // fallback: Enter key on the input
  input.dispatchEvent(new KeyboardEvent('keydown', { key: 'Enter', code: 'Enter', bubbles: true }));
}
```

### While the assistant is generating

The send button is replaced by the stop button:

```js
document.querySelector('[data-testid="hatch-composer-stop-button"]')
// present only while a response is streaming; absent when idle
```

---

## 3. Message list

### Scroll container

```js
document.getElementById('hatch-chat-scroll')
```

| Attribute | Value                                                              |
|-----------|--------------------------------------------------------------------|
| tag       | `DIV`                                                              |
| id        | `hatch-chat-scroll`                                                |
| class     | `flex flex-col overflow-hidden relative z-0 grow-1 shrink-1 min-h-0` |

### List element

```js
document.querySelector('div[role="log"]')
```

| Attribute    | Value                                              |
|--------------|----------------------------------------------------|
| tag          | `DIV`                                              |
| `role`       | `log`                                              |
| `aria-label` | `Chat messages`                                    |
| class        | `mx-auto w-full max-w-3xl min-w-0 @container flex` |

Parent chain of a message (bottom-up):

```
div[data-message-id]            ← one per message, class "flex flex-col gap-2"
└── div[role="log"][aria-label="Chat messages"]
    └── div
        └── div
            └── div
                └── div#hatch-chat-scroll
```

### Individual message

Selector for all messages:

```js
document.querySelectorAll('[data-message-id]')
```

Author is encoded in the id prefix — **there are no author/time sub-elements**
(no `<article>`, no `<time>`, no `data-testid` containing "message"):

| Author    | `data-message-id` format        | `innerText` prefix       |
|-----------|--------------------------------|--------------------------|
| assistant | `assistant-msg-<uuid>`         | `Assistant message: ...` |
| user      | `<uuid>` (bare, no prefix)     | `User message: ...` *    |

\* User-message text prefix not directly observed (no user messages were
rendered at capture time); author detection via the id prefix is the
reliable signal.

### Extracting text / author

```js
const msgs = [...document.querySelectorAll('[data-message-id]')].map(m => {
  const id = m.getAttribute('data-message-id');
  return {
    id,
    author: id.startsWith('assistant-msg') ? 'assistant' : 'user',
    text: m.innerText
  };
});
```

### Simple read-back (what `muse-chat-api.py messages` does)

```js
[...document.querySelectorAll('p')].slice(-n * 2).map(p => p.innerText.slice(0, width))
```

Works because message bodies render as `<p>` elements; the last `2n`
paragraphs cover roughly the last `n` messages. Crude but effective for
"did my text land?" verification.

### Message-related testids seen in the wild

| testid                                | Meaning                              | Present when |
|---------------------------------------|--------------------------------------|--------------|
| `hatch-chat-typing-indicator`         | assistant is typing/generating        | generating only |
| `hatch-composer-stop-button`          | stop-generation button               | generating only |
| `hatch-composer-placeholder-overlay`  | "Message" ghost text                 | composer empty |
| `hatch-chat-switcher-unread-indicator`| unread badge on the chat switcher    | unread chats exist |

---

## 4. Chat activation button (speech-bubble / nav)

This is the dock-rail button that activates the Chat section. The user's
finding: sidechat create only works when the chat function is active, and
this button (not Ctrl+J) is the reliable activator.

### Selector

```js
document.querySelector('[data-testid="hatch-nav-chat"]')
```

### Observed attributes

| Attribute      | Value                                                      |
|----------------|------------------------------------------------------------|
| tag            | `A` (anchor, not button)                                   |
| `data-testid`  | `hatch-nav-chat`                                           |
| `href`         | `/`                                                        |
| `aria-label`   | dynamic: `Chat` or `Chat, N notifications` (e.g. `Chat, 2 notifications`) |
| `aria-current` | `page` when Chat is the active section (absent otherwise)   |
| visible        | `true` (dock rail is always rendered)                      |

### Parent chain (4 levels)

```
a[data-testid="hatch-nav-chat"][aria-label="Chat, 2 notifications"][aria-current="page"]
└── div
    └── div
        └── div
            └── div[data-testid="hatch-dock-rail"]
```

### States

| State | Signal |
|-------|--------|
| Chat section active | `aria-current="page"` present |
| Chat section inactive | `aria-current` absent (button still visible/clickable) |
| Unread messages | `aria-label` contains `N notifications` |

### Usage

```js
// Activate chat reliably (replaces Ctrl+J):
document.querySelector('[data-testid="hatch-nav-chat"]').click();
```

`cmd_sidechat_main` already falls back to this click when the "Main chat"
element lookup fails. Sibling nav buttons in the same rail:
`hatch-nav-search` (Search), plus `div[role="button"]` items for Feed, Ideas,
Goals, Library, and `hatch-dock-more` (Settings).

---

## 5. Loading / empty states

| State | How to detect |
|-------|---------------|
| New empty thread (`/thread/new`) | URL is `/thread/new`, `document.title === "Muse"`, zero `[data-message-id]` elements, composer present |
| Main chat loaded | URL is `/`, title is `Chat — <agent>`, `[data-message-id]` elements present |
| Assistant generating | `[data-testid="hatch-chat-typing-indicator"]` exists; send button replaced by `[data-testid="hatch-composer-stop-button"]` |
| Idle, ready to send | typing indicator absent, stop button absent, `textarea[aria-label="Message"]` visible and enabled |
| Composer empty | `[data-testid="hatch-composer-placeholder-overlay"]` visible with text `Message` |
| Side panel open (threads visible) | `[data-testid="hatch-chat-compose"]` ("New side chat") present |

### Page-title signals

| Title | Meaning |
|-------|---------|
| `Chat — <agent>` | logged in, chat UI loaded |
| `Muse` | partial load or `/thread/new` stripped state — treat as not-ready, navigate to `/` first |

---

## Quick-reference selector list

```js
// Composer
'textarea[aria-label="Message"]'
'[data-testid="hatch-composer-placeholder-overlay"]'  // empty-state ghost text

// Send / stop
'button[aria-label="Send"]'                            // via aria-label includes 'send'
'[data-testid="hatch-composer-stop-button"]'           // while generating

// Messages
'#hatch-chat-scroll'                                   // scroll container
'div[role="log"][aria-label="Chat messages"]'          // list
'[data-message-id]'                                    // each message
'[data-message-id^="assistant-msg"]'                   // assistant messages only

// Chat activation
'[data-testid="hatch-nav-chat"]'                        // dock-rail Chat link
'[data-testid="hatch-chat-typing-indicator"]'          // generating indicator
```

## Caveats

- Selectors observed on the `opm` account; class names are Tailwind-ish and
  may shift with deploys — prefer `data-testid`, `aria-label`, `role`, and
  `id` selectors over classes.
- `aria-label` on `hatch-nav-chat` embeds a live notification count; match
  with `startsWith('Chat')` or the testid, never exact equality.
- During this capture another agent was driving the same browser; page URL
  flipped between `/` and `/thread/new` between probes. Element identities
  above were each verified at least once against the live DOM.