# Activity feed (`activity-feed`)

Who-did-what rows on a dotted spine — actor, time, and a message bubble.

> **Layer:** L1 surface · **Recipe:** _(unset — see docs/agent/pick-a-surface.md)_
> Curriculum: `AGENTS.md` · pick matrix: `docs/agent/pick-a-surface.md` · blast radius: `CONSUMER_MAP.md`

> **Dialect:** Partial below is **unprefixed** (gallery / standalone HM). DOM contract Python often uses the **source token** `data-dz-*` / `dz-*` (Dazzle dual-lock). Match the CSS/JS bundle you load.

> **Demo vs contract:** Live gallery behaviour may use `/mock/*` or flash toasts. Those are **offline demos only** — implement **Server exchange** + **DOM contract**, not the mock. See AGENTS.md › Gallery demos.

## Copy this

```html
<div class="hm-measure-lg">
  <ul class="activity-feed">
    <li class="activity-row" data-activity-row>
      <span class="activity-dot"><svg fill="currentColor" viewBox="0 0 20 20" aria-hidden="true"><circle cx="10" cy="10" r="6"/></svg></span>
      <div class="activity-row-inner">
        <div class="activity-time">09:41</div>
        <div class="activity-bubble"><span class="activity-actor">Ada</span> approved the refund.</div>
      </div>
    </li>
    <li class="activity-row" data-activity-row>
      <span class="activity-dot"><svg fill="currentColor" viewBox="0 0 20 20" aria-hidden="true"><circle cx="10" cy="10" r="6"/></svg></span>
      <div class="activity-row-inner">
        <div class="activity-time">09:12</div>
        <div class="activity-bubble"><span class="activity-actor">System</span> flagged the account for review.</div>
      </div>
    </li>
  </ul>
</div>
```

## Server exchange

This Hyperpart has **no server exchange** — presentation or client chrome only. If you put `hx-*` on a control that uses this markup, that action's exchange belongs to the action, not this part.

## Swap contract

Agent-visible HTMX topology (ADR-0054 / decision 0012). **Exchange envelope** = what the response may re-emit relative to the persistent slot (`body_only` | `outer` | `none` | `host_owned` | `document`). Dual-lock validates part markup only — not this envelope. Stem: `stems/morph-safe-hypermedia.md`.

**No host HTMX exchange** on this part — presentation or client chrome only. **Exchange envelope:** `n/a`.

If a **host** wraps this markup in `hx-*`, **that host owns the swap contract** (sole identity + envelope). Prefer `innerMorph` / `outerMorph` for stable slots; replacement for flash; body-only responses under inner swaps.

### Envelope response examples

What the **server returns** for each exchange. Match the **exchange envelope**; dual-lock still applies to interior markup.

This part has no owned exchange (envelope `n/a`). If a host adds `hx-*`, that host’s envelope applies — typically `body_only`:

```html
<!-- Prefer hx-swap=innerMorph into a stable body slot -->
<div class="dz-stack">content…</div>
```

Do **not** re-own the slot:

```html
<div id="activity-feed-root" data-dz-region>…</div>
```

## How to use it

No extended guidance authored yet — start from Copy this and the dependency chips.

### Seams

- copy the partial under Copy this; keep root class and data-* modifiers so the CSS/JS bundle matches
- no Server exchange on this part — pure presentation or client chrome
- satisfy the DOM contract tables (CI stop-ship)

## DOM contract

What emitted markup must satisfy (CI: `tests/test_contracts.py`). Do not invent attrs outside the tables. Python modules under `contracts/` are **package-internal dual-locks** (`from contracts._kit import …`) — not FastAPI business handlers. App servers implement **Server exchange** endpoints; this section constrains the HTML those endpoints return.

### `contracts/activity_feed.py`

- **Required root:** `[data-dz-activity-row]` (part `activity-feed`)

| Node | Attr | Constraint |
|---|---|---|
| `[data-dz-activity-row]` | `data-dz-activity-row` | present (any value) |

#### Ingestion model `ActivityRow`

| Field | Type | Required |
|---|---|---|
| `time_str` | `string` | yes |
| `description` | `string` | yes |
| `actor` | `string` | no |
| `actor_html` | `string` | no |
| `drill_url` | `string` | no |

#### Exemplar `render()`

```python
def render(row: ActivityRow) -> str:
    """Model → one ``<li>`` activity row."""
    time_s = html.escape(row.time_str)
    actor_html = ""
    trusted = (row.actor_html or "").strip()
    if trusted:
        actor_html = f'<span class="dz-activity-actor">{trusted}</span> '
    elif row.actor:
        actor_html = f'<span class="dz-activity-actor">{html.escape(row.actor)}</span> '
    desc = html.escape(row.description)
    if row.drill_url:
        href = html.escape(row.drill_url, quote=True)
        # Empty drill_url stays byte-stable plain text (no anchor).
        desc_html = f'<a href="{href}" data-dz-activity-drill>{desc}</a>'
    else:
        desc_html = desc
    # Trailing space after bubble open class mirrors Dazzle emitter legacy.
    return (
        f'<li class="dz-activity-row" data-dz-activity-row>'
        f'<span class="dz-activity-dot">{_DOT_SVG}</span>'
        f'<div class="dz-activity-row-inner">'
        f'<div class="dz-activity-time">{time_s}</div>'
        f'<div class="dz-activity-bubble" >'
        f"{actor_html}{desc_html}"
        f"</div>"
        f"</div>"
        f"</li>"
    )
```

## Notes

Dual-lock root is data-dz-activity-row (contracts/activity_feed.py). Rows are server-rendered newest-first; an empty feed renders dz-activity-empty. The dot column and bubble keep alignment without a grid — the row is the flex unit.

## Source files

- `site/registry.py` (partial + exchanges + guidance)
- `contracts/activity_feed.py`