First load / no messages

Renders inside #messages when S.messages is empty. Logo + title + subtitle + 3 suggestion buttons.

Right-aligned bubble, attachments, and edit mode

User rows have no avatar/label — the right-edge alignment and tinted bubble identify the sender. Timestamp + edit/copy live in a .msg-foot below the bubble, revealed on hover (forced visible here).

Paragraphs, emphasis, lists, blockquote, hr, links

Assistant output is a single .msg-row.assistant-turn that holds one role header + an .assistant-turn-blocks column of one-or-more .assistant-segment children. Each segment may contain a .thinking-card, a .msg-body, and its own .msg-foot (copy / regen). This lets a turn stream reasoning → text → tool calls → more text without repeating the Hermes avatar each time.

Plain, with header, with copy button, multi-language

npm install
npm run dev -- --workspace ~/code

export async function startServer(opts: ServerOptions) {
  const port = opts.port ?? 3000;
  const app = createApp();
  app.listen(port, () => {
    console.log(`Hermes listening on :${port}`);
  });
  return app;
}

from hermes import Agent

def main() -> None:
    agent = Agent(model="claude-opus-4-6")
    reply = agent.run("Summarise today's commits")
    print(reply)

if __name__ == "__main__":
    main()

{
  "model": "claude-sonnet-4-6",
  "stream": true,
  "tools": ["bash", "edit_file", "search"]
}

Images (default & zoomed) and downloadable links

.msg-media-img (default + .msg-media-img--full)

HHermes

Here's the screenshot you asked for (click to zoom):

And the full-width variant:

KaTeX inline / block & Mermaid block

graph LR
  U[User] --> C[Composer]
  C --> API[/api/chat/]
  API --> M((Model))
  M --> T{tool?}
  T -- yes --> X[Tool Runner]
  T -- no  --> R[Reply]
  X --> R
  R --> U

Bordered panel (collapsed / open, animated), live loader, streaming cursor

Thinking cards are rendered at the top of an .assistant-segment. They're now bordered gold-tinted panels (no more left-rule-only look) and expand/collapse with a max-height + opacity transition. Click the header in either example below to see the animation live.

The user asked about the dev server...

The user is asking about launching the dev server.
Options: npm script, docker, or the bundled CLI.
The CLI is the simplest — no container runtime needed.
I should show the exact commands and the --workspace flag,
then mention the env var for the API key at the end.

Running, done, expanded, subagent, error, multi-card toggle

Tool cards sit in .tool-card-row wrappers (no longer nested under .msg-row). The details panel now animates open/closed via max-height + opacity — click any header below to see the transition.

static/style.css:430:  .msg-role{font-size:12px;font-weight:500...}
static/style.css:431:  .msg-role.user{color:rgba(124,185,255,0.65);}
static/style.css:432:  .msg-role.assistant{color:rgba(201,168,76,0.6);}
static/ui.js:1141:    const roleEl = el('div', 'msg-role ' + role);

src/server.ts:42:7 - error TS2345: Argument of type 'string | undefined'
  is not assignable to parameter of type 'number'.

42       app.listen(opts.port, () => {
         ~~~~~~~~~

Role timestamp tooltip, footer action toolbar, token-usage badge

Assistant timestamps live on the .msg-role title attribute (hover for full date). Copy/regen buttons sit in the per-segment .msg-foot, 45% opacity at rest, full on turn hover. The .msg-usage badge is always visible at the bottom of the turn.

User turn → assistant turn (segment 1: thinking + body + tool cards) → usage

A realistic turn: one role header up top, then the segment hosting a thinking card plus the first body; tool cards follow as siblings of the turn inside .messages-inner; the usage badge closes the turn.

Attached server.ts — probably typing issue.
Run typecheck to confirm, then patch.

export function startServer(opts: { port: number }) {
  app.listen(opts.port);
}

export function startServer(opts: { port?: number } = {}) {
  const port = opts.port ?? 3000;
  app.listen(port);
}

export function startServer(opts: ServerOptions) {
  app.listen(opts.port, () => { ... });
}

Opt-in via body.bubble-layout — extra bubble padding for assistant too

The default layout already right-aligns user messages (the redesign adopted it globally), so this toggle mostly affects additional padding / boundary handling. Flip the Bubble layout toggle in the header to see the mode applied.

Compression, cancellation, errors — rendered as italicised assistant messages

Right-alignment separates user turns · day-change separator

The dashed divider before each user turn was removed — the right-edge bubble alignment is its own visual break, so only a small vertical gap (10px top margin) remains between turns. Day changes still get a centred .msg-date-sep.

Approval & Clarify cards + reconnect banner

Wrappers and state markers produced by renderMessages()