Phase 1: single agent + basic UIHEADmain

- Bun monorepo with @dispatch/core, @dispatch/api, @dispatch/frontend
- Agent runtime with Vercel AI SDK, streaming via WebSocket
- Tools: read_file, write_file, list_files (scoped to working directory)
- Hono API server with POST /chat, GET /status, GET /health, WS /ws
- Svelte 5 + DaisyUI frontend with chat UI, theme switcher, copy button
- OpenCode Go (Zen) as LLM provider, deepseek-v4-flash-free model
- Docker setup (dev + prod) with bin/ scripts and gopass secrets
- Biome v2 linting/formatting, Vitest tests (44 passing)
- Debug info attached to error messages for diagnostics

6 files changed, 298 insertions, 0 deletions

diff --git a/packages/frontend/src/lib/components/ChatInput.svelte b/packages/frontend/src/lib/components/ChatInput.svelte
new file mode 100644
index 0000000..b929923
--- /dev/null
+++ b/packages/frontend/src/lib/components/ChatInput.svelte
@@ -0,0 +1,45 @@
+<script lang="ts">
+import { chatStore } from "../chat.svelte.js";
+
+let inputEl: HTMLInputElement | undefined;
+let inputValue = $state("");
+const isDisabled = $derived(chatStore.agentStatus === "running");
+
+$effect(() => {
+	inputEl?.focus();
+});
+
+function handleKeydown(e: KeyboardEvent) {
+	if (e.key === "Enter" && !e.shiftKey) {
+		e.preventDefault();
+		submit();
+	}
+}
+
+function submit() {
+	const text = inputValue.trim();
+	if (!text || isDisabled) return;
+	inputValue = "";
+	chatStore.sendMessage(text);
+}
+</script>
+
+<div class="flex items-center gap-2 p-3 border-t border-base-300 bg-base-100">
+	<input
+		bind:this={inputEl}
+		bind:value={inputValue}
+		type="text"
+		placeholder={isDisabled ? "Agent is running..." : "Type a message..."}
+		class="input input-bordered flex-1"
+		disabled={isDisabled}
+		onkeydown={handleKeydown}
+	/>
+	<button
+		type="button"
+		class="btn btn-primary"
+		disabled={isDisabled || !inputValue.trim()}
+		onclick={submit}
+	>
+		Send
+	</button>
+</div>
diff --git a/packages/frontend/src/lib/components/ChatMessage.svelte b/packages/frontend/src/lib/components/ChatMessage.svelte
new file mode 100644
index 0000000..447bb29
--- /dev/null
+++ b/packages/frontend/src/lib/components/ChatMessage.svelte
@@ -0,0 +1,26 @@
+<script lang="ts">
+import type { ChatMessage } from "../types.js";
+import ToolCallDisplay from "./ToolCallDisplay.svelte";
+
+const { message }: { message: ChatMessage } = $props();
+
+const isUser = $derived(message.role === "user");
+</script>
+
+<div class="chat {isUser ? 'chat-end' : 'chat-start'} mb-2">
+	<div class="chat-bubble {isUser ? 'chat-bubble-primary' : 'chat-bubble-secondary'} max-w-[80%] break-words">
+		{#if message.content}
+			<span>{message.content}</span>
+		{/if}
+		{#if message.isStreaming}
+			<span class="inline-block w-2 h-4 bg-current animate-pulse ml-0.5 align-middle">▌</span>
+		{/if}
+		{#if message.toolCalls && message.toolCalls.length > 0}
+			<div class="mt-2">
+				{#each message.toolCalls as toolCall (toolCall.id)}
+					<ToolCallDisplay {toolCall} />
+				{/each}
+			</div>
+		{/if}
+	</div>
+</div>
diff --git a/packages/frontend/src/lib/components/ChatPanel.svelte b/packages/frontend/src/lib/components/ChatPanel.svelte
new file mode 100644
index 0000000..44efb0b
--- /dev/null
+++ b/packages/frontend/src/lib/components/ChatPanel.svelte
@@ -0,0 +1,58 @@
+<script lang="ts">
+import { chatStore } from "../chat.svelte.js";
+import { wsClient } from "../ws.svelte.js";
+import ChatMessageComponent from "./ChatMessage.svelte";
+
+let messagesEl: HTMLDivElement | undefined;
+
+const statusColor = $derived(
+	wsClient.connectionStatus === "connected"
+		? "bg-success"
+		: wsClient.connectionStatus === "connecting"
+			? "bg-warning"
+			: "bg-error",
+);
+
+$effect(() => {
+	// Trigger on messages change to scroll
+	void chatStore.messages;
+	if (messagesEl) {
+		messagesEl.scrollTop = messagesEl.scrollHeight;
+	}
+});
+</script>
+
+<div class="flex flex-col h-full">
+	<!-- Status bar -->
+	<div class="flex items-center gap-3 px-4 py-2 bg-base-200 border-b border-base-300 text-xs">
+		<span class="flex items-center gap-1.5">
+			<span class="w-2 h-2 rounded-full {statusColor}"></span>
+			<span class="capitalize text-base-content/70">{wsClient.connectionStatus}</span>
+		</span>
+		<span class="text-base-content/50">|</span>
+		<span class="text-base-content/70">
+			Agent:
+			<span
+				class="font-semibold {chatStore.agentStatus === 'running'
+					? 'text-warning'
+					: chatStore.agentStatus === 'error'
+						? 'text-error'
+						: 'text-success'}"
+			>
+				{chatStore.agentStatus === "running" ? "running..." : chatStore.agentStatus}
+			</span>
+		</span>
+	</div>
+
+	<!-- Messages -->
+	<div bind:this={messagesEl} class="flex-1 overflow-y-auto p-4">
+		{#if chatStore.messages.length === 0}
+			<div class="flex items-center justify-center h-full text-base-content/40 text-sm">
+				Send a message to start a conversation
+			</div>
+		{/if}
+		{#each chatStore.messages as message (message.id)}
+			<ChatMessageComponent {message} />
+		{/each}
+	</div>
+</div>
diff --git a/packages/frontend/src/lib/components/Header.svelte b/packages/frontend/src/lib/components/Header.svelte
new file mode 100644
index 0000000..79d371c
--- /dev/null
+++ b/packages/frontend/src/lib/components/Header.svelte
@@ -0,0 +1,54 @@
+<script lang="ts">
+import { chatStore } from "../chat.svelte.js";
+import ThemeSwitcher from "./ThemeSwitcher.svelte";
+
+let showThemeSwitcher = $state(false);
+let copyLabel = $state("Copy");
+
+function resetCopyLabel() {
+	copyLabel = "Copy";
+}
+
+async function handleCopy() {
+	const text = chatStore.copyConversation();
+	try {
+		await navigator.clipboard.writeText(text);
+		copyLabel = "Copied";
+		setTimeout(resetCopyLabel, 1500);
+	} catch {
+		copyLabel = "Failed";
+		setTimeout(resetCopyLabel, 1500);
+	}
+}
+</script>
+
+<header class="navbar bg-base-200 border-b border-base-300 px-4 min-h-14 flex-shrink-0">
+	<div class="flex-1">
+		<span class="text-xl font-bold tracking-tight">Dispatch</span>
+	</div>
+	<div class="flex-none flex items-center gap-3">
+		<span class="text-xs text-base-content/60 hidden sm:block">
+			DeepSeek V4 Flash via OpenCode Go
+		</span>
+		<button
+			type="button"
+			class="btn btn-ghost btn-sm"
+			onclick={handleCopy}
+			aria-label="Copy conversation"
+		>
+			{copyLabel}
+		</button>
+		<button
+			type="button"
+			class="btn btn-ghost btn-sm"
+			onclick={() => (showThemeSwitcher = !showThemeSwitcher)}
+			aria-label="Switch theme"
+		>
+			Theme
+		</button>
+	</div>
+</header>
+
+{#if showThemeSwitcher}
+	<ThemeSwitcher onclose={() => (showThemeSwitcher = false)} />
+{/if}
diff --git a/packages/frontend/src/lib/components/ThemeSwitcher.svelte b/packages/frontend/src/lib/components/ThemeSwitcher.svelte
new file mode 100644
index 0000000..6984e3f
--- /dev/null
+++ b/packages/frontend/src/lib/components/ThemeSwitcher.svelte
@@ -0,0 +1,65 @@
+<script lang="ts">
+const THEMES = [
+	"light",
+	"dark",
+	"dracula",
+	"night",
+	"nord",
+	"sunset",
+	"cyberpunk",
+	"forest",
+	"cmyk",
+	"coffee",
+	"caramellatte",
+] as const;
+
+const STORAGE_KEY = "dispatch-theme";
+
+const { onclose }: { onclose: () => void } = $props();
+
+let currentTheme = $state(
+	(typeof localStorage !== "undefined" && localStorage.getItem(STORAGE_KEY)) || "dark",
+);
+
+function selectTheme(theme: string) {
+	currentTheme = theme;
+	document.documentElement.setAttribute("data-theme", theme);
+	localStorage.setItem(STORAGE_KEY, theme);
+	onclose();
+}
+</script>
+
+<!-- Backdrop -->
+<div
+	class="fixed inset-0 z-40 bg-black/40"
+	role="button"
+	tabindex="0"
+	onclick={onclose}
+	onkeydown={(e) => e.key === "Escape" && onclose()}
+	aria-label="Close theme switcher"
+></div>
+
+<!-- Modal -->
+<div
+	class="fixed top-16 right-4 z-50 bg-base-100 border border-base-300 rounded-xl shadow-xl p-4 w-56"
+	role="dialog"
+	aria-label="Theme switcher"
+>
+	<p class="text-sm font-semibold mb-3 text-base-content">Select Theme</p>
+	<ul class="space-y-1">
+		{#each THEMES as theme}
+			<li>
+				<button
+					type="button"
+					class="w-full text-left px-3 py-1.5 rounded-lg text-sm capitalize hover:bg-base-200 transition-colors {currentTheme ===
+					theme
+						? 'bg-primary text-primary-content'
+						: ''}"
+					onclick={() => selectTheme(theme)}
+				>
+					{theme}
+				</button>
+			</li>
+		{/each}
+	</ul>
+</div>
diff --git a/packages/frontend/src/lib/components/ToolCallDisplay.svelte b/packages/frontend/src/lib/components/ToolCallDisplay.svelte
new file mode 100644
index 0000000..f8e1f38
--- /dev/null
+++ b/packages/frontend/src/lib/components/ToolCallDisplay.svelte
@@ -0,0 +1,50 @@
+<script lang="ts">
+import type { ToolCallDisplay } from "../types.js";
+
+const { toolCall }: { toolCall: ToolCallDisplay } = $props();
+
+let isExpanded = $state(toolCall.isExpanded);
+
+function toggle() {
+	isExpanded = !isExpanded;
+}
+</script>
+
+<div class="collapse collapse-arrow bg-base-200 my-1 rounded-lg border border-base-300">
+	<button
+		type="button"
+		class="collapse-title flex items-center gap-2 text-sm font-medium cursor-pointer w-full text-left"
+		onclick={toggle}
+		aria-expanded={isExpanded}
+	>
+		<span class="badge badge-neutral badge-sm">tool</span>
+		<span class="font-mono">{toolCall.name}</span>
+		{#if toolCall.result !== undefined}
+			{#if toolCall.isError}
+				<span class="badge badge-error badge-sm ml-auto">error</span>
+			{:else}
+				<span class="badge badge-success badge-sm ml-auto">done</span>
+			{/if}
+		{:else}
+			<span class="badge badge-warning badge-sm ml-auto">pending</span>
+		{/if}
+	</button>
+
+	{#if isExpanded}
+		<div class="collapse-content text-xs">
+			<div class="mt-2">
+				<p class="font-semibold text-base-content/70 mb-1">Arguments</p>
+				<pre class="bg-base-300 rounded p-2 overflow-auto max-h-40 whitespace-pre-wrap break-all">{JSON.stringify(toolCall.arguments, null, 2)}</pre>
+			</div>
+			{#if toolCall.result !== undefined}
+				<div class="mt-2">
+					<p class="font-semibold text-base-content/70 mb-1">Result</p>
+					<pre
+						class="rounded p-2 overflow-auto max-h-40 whitespace-pre-wrap break-all {toolCall.isError
+							? 'bg-error/20 text-error'
+							: 'bg-base-300'}">{toolCall.result}</pre>
+				</div>
+			{/if}
+		</div>
+	{/if}
+</div>