web-ui package

packages/web-ui/src/tools/artifacts/ArtifactElement.ts

@@ -0,0 +1,15 @@
+import { LitElement, type TemplateResult } from "lit";
+
+export abstract class ArtifactElement extends LitElement {
+	public filename = "";
+	public displayTitle = "";
+
+	protected override createRenderRoot(): HTMLElement | DocumentFragment {
+		return this; // light DOM for shared styles
+	}
+
+	public abstract get content(): string;
+	public abstract set content(value: string);
+
+	abstract getHeaderButtons(): TemplateResult | HTMLElement;
+}

packages/web-ui/src/tools/artifacts/HtmlArtifact.ts

@@ -0,0 +1,221 @@
+import { CopyButton, DownloadButton, PreviewCodeToggle } from "@mariozechner/mini-lit";
+import hljs from "highlight.js";
+import { html } from "lit";
+import { customElement, property, state } from "lit/decorators.js";
+import { createRef, type Ref, ref } from "lit/directives/ref.js";
+import { unsafeHTML } from "lit/directives/unsafe-html.js";
+import type { SandboxIframe } from "../../components/SandboxedIframe.js";
+import type { Attachment } from "../../utils/attachment-utils.js";
+import { i18n } from "../../utils/i18n.js";
+import "../../components/SandboxedIframe.js";
+import { ArtifactElement } from "./ArtifactElement.js";
+
+@customElement("html-artifact")
+export class HtmlArtifact extends ArtifactElement {
+	@property() override filename = "";
+	@property({ attribute: false }) override displayTitle = "";
+	@property({ attribute: false }) attachments: Attachment[] = [];
+	@property({ attribute: false }) sandboxUrlProvider?: () => string;
+
+	private _content = "";
+	private logs: Array<{ type: "log" | "error"; text: string }> = [];
+
+	// Refs for DOM elements
+	private sandboxIframeRef: Ref<SandboxIframe> = createRef();
+	private consoleLogsRef: Ref<HTMLDivElement> = createRef();
+	private consoleButtonRef: Ref<HTMLButtonElement> = createRef();
+
+	// Store message handler so we can remove it
+	private messageHandler?: (e: MessageEvent) => void;
+
+	@state() private viewMode: "preview" | "code" = "preview";
+	@state() private consoleOpen = false;
+
+	private setViewMode(mode: "preview" | "code") {
+		this.viewMode = mode;
+	}
+
+	public getHeaderButtons() {
+		const toggle = new PreviewCodeToggle();
+		toggle.mode = this.viewMode;
+		toggle.addEventListener("mode-change", (e: Event) => {
+			this.setViewMode((e as CustomEvent).detail);
+		});
+
+		const copyButton = new CopyButton();
+		copyButton.text = this._content;
+		copyButton.title = i18n("Copy HTML");
+		copyButton.showText = false;
+
+		return html`
+			<div class="flex items-center gap-2">
+				${toggle}
+				${copyButton}
+				${DownloadButton({ content: this._content, filename: this.filename, mimeType: "text/html", title: i18n("Download HTML") })}
+			</div>
+		`;
+	}
+
+	override set content(value: string) {
+		const oldValue = this._content;
+		this._content = value;
+		if (oldValue !== value) {
+			// Reset logs when content changes
+			this.logs = [];
+			if (this.consoleLogsRef.value) {
+				this.consoleLogsRef.value.innerHTML = "";
+			}
+			this.requestUpdate();
+			// Execute content in sandbox if it exists
+			if (this.sandboxIframeRef.value && value) {
+				this.updateConsoleButton();
+				this.executeContent(value);
+			}
+		}
+	}
+
+	private executeContent(html: string) {
+		const sandbox = this.sandboxIframeRef.value;
+		if (!sandbox) return;
+
+		// Configure sandbox URL provider if provided (for browser extensions)
+		if (this.sandboxUrlProvider) {
+			sandbox.sandboxUrlProvider = this.sandboxUrlProvider;
+		}
+
+		// Remove previous message handler if it exists
+		if (this.messageHandler) {
+			window.removeEventListener("message", this.messageHandler);
+		}
+
+		const sandboxId = `artifact-${this.filename}`;
+
+		// Set up message listener to collect logs
+		this.messageHandler = (e: MessageEvent) => {
+			if (e.data.sandboxId !== sandboxId) return;
+
+			if (e.data.type === "console") {
+				this.logs.push({
+					type: e.data.method === "error" ? "error" : "log",
+					text: e.data.text,
+				});
+				this.updateConsoleButton();
+			}
+		};
+		window.addEventListener("message", this.messageHandler);
+
+		// Load content (iframe persists, doesn't get removed)
+		sandbox.loadContent(sandboxId, html, this.attachments);
+	}
+
+	override get content(): string {
+		return this._content;
+	}
+
+	override disconnectedCallback() {
+		super.disconnectedCallback();
+		// Clean up message handler when element is removed from DOM
+		if (this.messageHandler) {
+			window.removeEventListener("message", this.messageHandler);
+			this.messageHandler = undefined;
+		}
+	}
+
+	override firstUpdated() {
+		// Execute initial content
+		if (this._content && this.sandboxIframeRef.value) {
+			this.executeContent(this._content);
+		}
+	}
+
+	override updated(changedProperties: Map<string | number | symbol, unknown>) {
+		super.updated(changedProperties);
+		// If we have content but haven't executed yet (e.g., during reconstruction),
+		// execute when the iframe ref becomes available
+		if (this._content && this.sandboxIframeRef.value && this.logs.length === 0) {
+			this.executeContent(this._content);
+		}
+	}
+
+	private updateConsoleButton() {
+		const button = this.consoleButtonRef.value;
+		if (!button) return;
+
+		const errorCount = this.logs.filter((l) => l.type === "error").length;
+		const text =
+			errorCount > 0
+				? `${i18n("console")} <span class="text-destructive">${errorCount} errors</span>`
+				: `${i18n("console")} (${this.logs.length})`;
+		button.innerHTML = `<span>${text}</span><span>${this.consoleOpen ? "▼" : "▶"}</span>`;
+	}
+
+	private toggleConsole() {
+		this.consoleOpen = !this.consoleOpen;
+		this.requestUpdate();
+
+		// Populate console logs if opening
+		if (this.consoleOpen) {
+			requestAnimationFrame(() => {
+				if (this.consoleLogsRef.value) {
+					// Populate with existing logs
+					this.consoleLogsRef.value.innerHTML = "";
+					this.logs.forEach((log) => {
+						const logEl = document.createElement("div");
+						logEl.className = `text-xs font-mono ${log.type === "error" ? "text-destructive" : "text-muted-foreground"}`;
+						logEl.textContent = `[${log.type}] ${log.text}`;
+						this.consoleLogsRef.value!.appendChild(logEl);
+					});
+				}
+			});
+		}
+	}
+
+	public getLogs(): string {
+		if (this.logs.length === 0) return i18n("No logs for {filename}").replace("{filename}", this.filename);
+		return this.logs.map((l) => `[${l.type}] ${l.text}`).join("\n");
+	}
+
+	override render() {
+		return html`
+			<div class="h-full flex flex-col">
+				<div class="flex-1 overflow-hidden relative">
+					<!-- Preview container - always in DOM, just hidden when not active -->
+					<div class="absolute inset-0 flex flex-col" style="display: ${this.viewMode === "preview" ? "flex" : "none"}">
+						<sandbox-iframe class="flex-1" ${ref(this.sandboxIframeRef)}></sandbox-iframe>
+						${
+							this.logs.length > 0
+								? html`
+									<div class="border-t border-border">
+										<button
+											@click=${() => this.toggleConsole()}
+											class="w-full px-3 py-1 text-xs text-left hover:bg-muted flex items-center justify-between"
+											${ref(this.consoleButtonRef)}
+										>
+											<span
+												>${i18n("console")}
+												${
+													this.logs.filter((l) => l.type === "error").length > 0
+														? html`<span class="text-destructive">${this.logs.filter((l) => l.type === "error").length} errors</span>`
+														: `(${this.logs.length})`
+												}</span
+											>
+											<span>${this.consoleOpen ? "▼" : "▶"}</span>
+										</button>
+										${this.consoleOpen ? html` <div class="max-h-48 overflow-y-auto bg-muted/50 p-2" ${ref(this.consoleLogsRef)}></div> ` : ""}
+									</div>
+								`
+								: ""
+						}
+					</div>
+
+					<!-- Code view - always in DOM, just hidden when not active -->
+					<div class="absolute inset-0 overflow-auto bg-background" style="display: ${this.viewMode === "code" ? "block" : "none"}">
+						<pre class="m-0 p-4 text-xs"><code class="hljs language-html">${unsafeHTML(
+							hljs.highlight(this._content, { language: "html" }).value,
+						)}</code></pre>
+					</div>
+				</div>
+			</div>
+		`;
+	}
+}

packages/web-ui/src/tools/artifacts/MarkdownArtifact.ts

@@ -0,0 +1,81 @@
+import { CopyButton, DownloadButton, PreviewCodeToggle } from "@mariozechner/mini-lit";
+import hljs from "highlight.js";
+import { html } from "lit";
+import { customElement, property, state } from "lit/decorators.js";
+import { unsafeHTML } from "lit/directives/unsafe-html.js";
+import { i18n } from "../../utils/i18n.js";
+import "@mariozechner/mini-lit/dist/MarkdownBlock.js";
+import { ArtifactElement } from "./ArtifactElement.js";
+
+@customElement("markdown-artifact")
+export class MarkdownArtifact extends ArtifactElement {
+	@property() override filename = "";
+	@property({ attribute: false }) override displayTitle = "";
+
+	private _content = "";
+	override get content(): string {
+		return this._content;
+	}
+	override set content(value: string) {
+		this._content = value;
+		this.requestUpdate();
+	}
+
+	@state() private viewMode: "preview" | "code" = "preview";
+
+	protected override createRenderRoot(): HTMLElement | DocumentFragment {
+		return this; // light DOM
+	}
+
+	private setViewMode(mode: "preview" | "code") {
+		this.viewMode = mode;
+	}
+
+	public getHeaderButtons() {
+		const toggle = new PreviewCodeToggle();
+		toggle.mode = this.viewMode;
+		toggle.addEventListener("mode-change", (e: Event) => {
+			this.setViewMode((e as CustomEvent).detail);
+		});
+
+		const copyButton = new CopyButton();
+		copyButton.text = this._content;
+		copyButton.title = i18n("Copy Markdown");
+		copyButton.showText = false;
+
+		return html`
+			<div class="flex items-center gap-2">
+				${toggle}
+				${copyButton}
+				${DownloadButton({
+					content: this._content,
+					filename: this.filename,
+					mimeType: "text/markdown",
+					title: i18n("Download Markdown"),
+				})}
+			</div>
+		`;
+	}
+
+	override render() {
+		return html`
+			<div class="h-full flex flex-col">
+				<div class="flex-1 overflow-auto">
+					${
+						this.viewMode === "preview"
+							? html`<div class="p-4"><markdown-block .content=${this.content}></markdown-block></div>`
+							: html`<pre class="m-0 p-4 text-xs whitespace-pre-wrap break-words"><code class="hljs language-markdown">${unsafeHTML(
+									hljs.highlight(this.content, { language: "markdown", ignoreIllegals: true }).value,
+								)}</code></pre>`
+					}
+				</div>
+			</div>
+		`;
+	}
+}
+
+declare global {
+	interface HTMLElementTagNameMap {
+		"markdown-artifact": MarkdownArtifact;
+	}
+}

packages/web-ui/src/tools/artifacts/SvgArtifact.ts

@@ -0,0 +1,77 @@
+import { CopyButton, DownloadButton, PreviewCodeToggle } from "@mariozechner/mini-lit";
+import hljs from "highlight.js";
+import { html } from "lit";
+import { customElement, property, state } from "lit/decorators.js";
+import { unsafeHTML } from "lit/directives/unsafe-html.js";
+import { i18n } from "../../utils/i18n.js";
+import { ArtifactElement } from "./ArtifactElement.js";
+
+@customElement("svg-artifact")
+export class SvgArtifact extends ArtifactElement {
+	@property() override filename = "";
+	@property({ attribute: false }) override displayTitle = "";
+
+	private _content = "";
+	override get content(): string {
+		return this._content;
+	}
+	override set content(value: string) {
+		this._content = value;
+		this.requestUpdate();
+	}
+
+	@state() private viewMode: "preview" | "code" = "preview";
+
+	protected override createRenderRoot(): HTMLElement | DocumentFragment {
+		return this; // light DOM
+	}
+
+	private setViewMode(mode: "preview" | "code") {
+		this.viewMode = mode;
+	}
+
+	public getHeaderButtons() {
+		const toggle = new PreviewCodeToggle();
+		toggle.mode = this.viewMode;
+		toggle.addEventListener("mode-change", (e: Event) => {
+			this.setViewMode((e as CustomEvent).detail);
+		});
+
+		const copyButton = new CopyButton();
+		copyButton.text = this._content;
+		copyButton.title = i18n("Copy SVG");
+		copyButton.showText = false;
+
+		return html`
+			<div class="flex items-center gap-2">
+				${toggle}
+				${copyButton}
+				${DownloadButton({ content: this._content, filename: this.filename, mimeType: "image/svg+xml", title: i18n("Download SVG") })}
+			</div>
+		`;
+	}
+
+	override render() {
+		return html`
+			<div class="h-full flex flex-col">
+				<div class="flex-1 overflow-auto">
+					${
+						this.viewMode === "preview"
+							? html`<div class="h-full flex items-center justify-center">
+								${unsafeHTML(this.content.replace(/<svg(\s|>)/i, (_m, p1) => `<svg class="w-full h-full"${p1}`))}
+							</div>`
+							: html`<pre class="m-0 p-4 text-xs"><code class="hljs language-xml">${unsafeHTML(
+									hljs.highlight(this.content, { language: "xml", ignoreIllegals: true }).value,
+								)}</code></pre>`
+					}
+				</div>
+			</div>
+		`;
+	}
+}
+
+declare global {
+	interface HTMLElementTagNameMap {
+		"svg-artifact": SvgArtifact;
+	}
+}

packages/web-ui/src/tools/artifacts/TextArtifact.ts

@@ -0,0 +1,148 @@
+import { CopyButton, DownloadButton } from "@mariozechner/mini-lit";
+import hljs from "highlight.js";
+import { html } from "lit";
+import { customElement, property } from "lit/decorators.js";
+import { unsafeHTML } from "lit/directives/unsafe-html.js";
+import { i18n } from "../../utils/i18n.js";
+import { ArtifactElement } from "./ArtifactElement.js";
+
+// Known code file extensions for highlighting
+const CODE_EXTENSIONS = [
+	"js",
+	"javascript",
+	"ts",
+	"typescript",
+	"jsx",
+	"tsx",
+	"py",
+	"python",
+	"java",
+	"c",
+	"cpp",
+	"cs",
+	"php",
+	"rb",
+	"ruby",
+	"go",
+	"rust",
+	"swift",
+	"kotlin",
+	"scala",
+	"dart",
+	"html",
+	"css",
+	"scss",
+	"sass",
+	"less",
+	"json",
+	"xml",
+	"yaml",
+	"yml",
+	"toml",
+	"sql",
+	"sh",
+	"bash",
+	"ps1",
+	"bat",
+	"r",
+	"matlab",
+	"julia",
+	"lua",
+	"perl",
+	"vue",
+	"svelte",
+];
+
+@customElement("text-artifact")
+export class TextArtifact extends ArtifactElement {
+	@property() override filename = "";
+	@property({ attribute: false }) override displayTitle = "";
+
+	private _content = "";
+	override get content(): string {
+		return this._content;
+	}
+	override set content(value: string) {
+		this._content = value;
+		this.requestUpdate();
+	}
+
+	protected override createRenderRoot(): HTMLElement | DocumentFragment {
+		return this; // light DOM
+	}
+
+	private isCode(): boolean {
+		const ext = this.filename.split(".").pop()?.toLowerCase() || "";
+		return CODE_EXTENSIONS.includes(ext);
+	}
+
+	private getLanguageFromExtension(ext: string): string {
+		const languageMap: Record<string, string> = {
+			js: "javascript",
+			ts: "typescript",
+			py: "python",
+			rb: "ruby",
+			yml: "yaml",
+			ps1: "powershell",
+			bat: "batch",
+		};
+		return languageMap[ext] || ext;
+	}
+
+	private getMimeType(): string {
+		const ext = this.filename.split(".").pop()?.toLowerCase() || "";
+		if (ext === "svg") return "image/svg+xml";
+		if (ext === "md" || ext === "markdown") return "text/markdown";
+		return "text/plain";
+	}
+
+	public getHeaderButtons() {
+		const copyButton = new CopyButton();
+		copyButton.text = this.content;
+		copyButton.title = i18n("Copy");
+		copyButton.showText = false;
+
+		return html`
+			<div class="flex items-center gap-1">
+				${copyButton}
+				${DownloadButton({
+					content: this.content,
+					filename: this.filename,
+					mimeType: this.getMimeType(),
+					title: i18n("Download"),
+				})}
+			</div>
+		`;
+	}
+
+	override render() {
+		const isCode = this.isCode();
+		const ext = this.filename.split(".").pop() || "";
+		return html`
+			<div class="h-full flex flex-col">
+				<div class="flex-1 overflow-auto">
+					${
+						isCode
+							? html`
+								<pre class="m-0 p-4 text-xs"><code class="hljs language-${this.getLanguageFromExtension(
+									ext.toLowerCase(),
+								)}">${unsafeHTML(
+									hljs.highlight(this.content, {
+										language: this.getLanguageFromExtension(ext.toLowerCase()),
+										ignoreIllegals: true,
+									}).value,
+								)}</code></pre>
+							`
+							: html` <pre class="m-0 p-4 text-xs font-mono">${this.content}</pre> `
+					}
+				</div>
+			</div>
+		`;
+	}
+}
+
+declare global {
+	interface HTMLElementTagNameMap {
+		"text-artifact": TextArtifact;
+	}
+}

packages/web-ui/src/tools/artifacts/artifacts.ts

@@ -0,0 +1,888 @@
+import { Button, Diff, icon } from "@mariozechner/mini-lit";
+import { type AgentTool, type Message, StringEnum, type ToolCall, type ToolResultMessage } from "@mariozechner/pi-ai";
+import { type Static, Type } from "@sinclair/typebox";
+import { html, LitElement, type TemplateResult } from "lit";
+import { customElement, property, state } from "lit/decorators.js";
+import { createRef, type Ref, ref } from "lit/directives/ref.js";
+import { X } from "lucide";
+import type { Attachment } from "../../utils/attachment-utils.js";
+import { i18n } from "../../utils/i18n.js";
+import type { ToolRenderer } from "../types.js";
+import type { ArtifactElement } from "./ArtifactElement.js";
+import { HtmlArtifact } from "./HtmlArtifact.js";
+import { MarkdownArtifact } from "./MarkdownArtifact.js";
+import { SvgArtifact } from "./SvgArtifact.js";
+import { TextArtifact } from "./TextArtifact.js";
+import "@mariozechner/mini-lit/dist/MarkdownBlock.js";
+import "@mariozechner/mini-lit/dist/CodeBlock.js";
+
+// Simple artifact model
+export interface Artifact {
+	filename: string;
+	title: string;
+	content: string;
+	createdAt: Date;
+	updatedAt: Date;
+}
+
+// JSON-schema friendly parameters object (LLM-facing)
+const artifactsParamsSchema = Type.Object({
+	command: StringEnum(["create", "update", "rewrite", "get", "delete", "logs"], {
+		description: "The operation to perform",
+	}),
+	filename: Type.String({ description: "Filename including extension (e.g., 'index.html', 'script.js')" }),
+	title: Type.Optional(Type.String({ description: "Display title for the tab (defaults to filename)" })),
+	content: Type.Optional(Type.String({ description: "File content" })),
+	old_str: Type.Optional(Type.String({ description: "String to replace (for update command)" })),
+	new_str: Type.Optional(Type.String({ description: "Replacement string (for update command)" })),
+});
+export type ArtifactsParams = Static<typeof artifactsParamsSchema>;
+
+// Minimal helper to render plain text outputs consistently
+function plainOutput(text: string): TemplateResult {
+	return html`<div class="text-xs text-muted-foreground whitespace-pre-wrap font-mono">${text}</div>`;
+}
+
+@customElement("artifacts-panel")
+export class ArtifactsPanel extends LitElement implements ToolRenderer<ArtifactsParams, undefined> {
+	@state() private _artifacts = new Map<string, Artifact>();
+	@state() private _activeFilename: string | null = null;
+
+	// Programmatically managed artifact elements
+	private artifactElements = new Map<string, ArtifactElement>();
+	private contentRef: Ref<HTMLDivElement> = createRef();
+
+	// External provider for attachments (decouples panel from AgentInterface)
+	@property({ attribute: false }) attachmentsProvider?: () => Attachment[];
+	// Sandbox URL provider for browser extensions (optional)
+	@property({ attribute: false }) sandboxUrlProvider?: () => string;
+	// Callbacks
+	@property({ attribute: false }) onArtifactsChange?: () => void;
+	@property({ attribute: false }) onClose?: () => void;
+	@property({ attribute: false }) onOpen?: () => void;
+	// Collapsed mode: hides panel content but can show a floating reopen pill
+	@property({ type: Boolean }) collapsed = false;
+	// Overlay mode: when true, panel renders full-screen overlay (mobile)
+	@property({ type: Boolean }) overlay = false;
+
+	// Public getter for artifacts
+	get artifacts() {
+		return this._artifacts;
+	}
+
+	protected override createRenderRoot(): HTMLElement | DocumentFragment {
+		return this; // light DOM for shared styles
+	}
+
+	override connectedCallback(): void {
+		super.connectedCallback();
+		this.style.display = "block";
+		this.style.height = "100%";
+		// Reattach existing artifact elements when panel is re-inserted into the DOM
+		requestAnimationFrame(() => {
+			const container = this.contentRef.value;
+			if (!container) return;
+			// Ensure we have an active filename
+			if (!this._activeFilename && this._artifacts.size > 0) {
+				this._activeFilename = Array.from(this._artifacts.keys())[0];
+			}
+			this.artifactElements.forEach((element, name) => {
+				if (!element.parentElement) container.appendChild(element);
+				element.style.display = name === this._activeFilename ? "block" : "none";
+			});
+		});
+	}
+
+	override disconnectedCallback() {
+		super.disconnectedCallback();
+		// Do not tear down artifact elements; keep them to restore on next mount
+	}
+
+	// Helper to determine file type from extension
+	private getFileType(filename: string): "html" | "svg" | "markdown" | "text" {
+		const ext = filename.split(".").pop()?.toLowerCase();
+		if (ext === "html") return "html";
+		if (ext === "svg") return "svg";
+		if (ext === "md" || ext === "markdown") return "markdown";
+		return "text";
+	}
+
+	// Helper to determine language for syntax highlighting
+	private getLanguageFromFilename(filename?: string): string {
+		if (!filename) return "text";
+		const ext = filename.split(".").pop()?.toLowerCase();
+		const languageMap: Record<string, string> = {
+			js: "javascript",
+			jsx: "javascript",
+			ts: "typescript",
+			tsx: "typescript",
+			html: "html",
+			css: "css",
+			scss: "scss",
+			json: "json",
+			py: "python",
+			md: "markdown",
+			svg: "xml",
+			xml: "xml",
+			yaml: "yaml",
+			yml: "yaml",
+			sh: "bash",
+			bash: "bash",
+			sql: "sql",
+			java: "java",
+			c: "c",
+			cpp: "cpp",
+			cs: "csharp",
+			go: "go",
+			rs: "rust",
+			php: "php",
+			rb: "ruby",
+			swift: "swift",
+			kt: "kotlin",
+			r: "r",
+		};
+		return languageMap[ext || ""] || "text";
+	}
+
+	// Get or create artifact element
+	private getOrCreateArtifactElement(filename: string, content: string, title: string): ArtifactElement {
+		let element = this.artifactElements.get(filename);
+
+		if (!element) {
+			const type = this.getFileType(filename);
+			if (type === "html") {
+				element = new HtmlArtifact();
+				(element as HtmlArtifact).attachments = this.attachmentsProvider?.() || [];
+				if (this.sandboxUrlProvider) {
+					(element as HtmlArtifact).sandboxUrlProvider = this.sandboxUrlProvider;
+				}
+			} else if (type === "svg") {
+				element = new SvgArtifact();
+			} else if (type === "markdown") {
+				element = new MarkdownArtifact();
+			} else {
+				element = new TextArtifact();
+			}
+			element.filename = filename;
+			element.displayTitle = title;
+			element.content = content;
+			element.style.display = "none";
+			element.style.height = "100%";
+
+			// Store element
+			this.artifactElements.set(filename, element);
+
+			// Add to DOM - try immediately if container exists, otherwise schedule
+			const newElement = element;
+			if (this.contentRef.value) {
+				this.contentRef.value.appendChild(newElement);
+			} else {
+				requestAnimationFrame(() => {
+					if (this.contentRef.value && !newElement.parentElement) {
+						this.contentRef.value.appendChild(newElement);
+					}
+				});
+			}
+		} else {
+			// Just update content
+			element.content = content;
+			element.displayTitle = title;
+			if (element instanceof HtmlArtifact) {
+				element.attachments = this.attachmentsProvider?.() || [];
+			}
+		}
+
+		return element;
+	}
+
+	// Show/hide artifact elements
+	private showArtifact(filename: string) {
+		// Ensure the active element is in the DOM
+		requestAnimationFrame(() => {
+			this.artifactElements.forEach((element, name) => {
+				if (this.contentRef.value && !element.parentElement) {
+					this.contentRef.value.appendChild(element);
+				}
+				element.style.display = name === filename ? "block" : "none";
+			});
+		});
+		this._activeFilename = filename;
+		this.requestUpdate(); // Only for tab bar update
+	}
+
+	// Open panel and focus an artifact tab by filename
+	private openArtifact(filename: string) {
+		if (this._artifacts.has(filename)) {
+			this.showArtifact(filename);
+			// Ask host to open panel (AgentInterface demo listens to onOpen)
+			this.onOpen?.();
+		}
+	}
+
+	// Build the AgentTool (no details payload; return only output strings)
+	public get tool(): AgentTool<typeof artifactsParamsSchema, undefined> {
+		return {
+			label: "Artifacts",
+			name: "artifacts",
+			description: `Creates and manages file artifacts. Each artifact is a file with a filename and content.
+
+IMPORTANT: Always prefer updating existing files over creating new ones. Check available files first.
+
+Commands:
+1. create: Create a new file
+   - filename: Name with extension (required, e.g., 'index.html', 'script.js', 'README.md')
+   - title: Display name for the tab (optional, defaults to filename)
+   - content: File content (required)
+
+2. update: Update part of an existing file
+   - filename: File to update (required)
+   - old_str: Exact string to replace (required)
+   - new_str: Replacement string (required)
+
+3. rewrite: Completely replace a file's content
+   - filename: File to rewrite (required)
+   - content: New content (required)
+   - title: Optionally update display title
+
+4. get: Retrieve the full content of a file
+   - filename: File to retrieve (required)
+   - Returns the complete file content
+
+5. delete: Delete a file
+   - filename: File to delete (required)
+
+6. logs: Get console logs and errors (HTML files only)
+   - filename: HTML file to get logs for (required)
+   - Returns all console output and runtime errors
+
+For text/html artifacts with attachments:
+- HTML artifacts automatically have access to user attachments via JavaScript
+- Available global functions in HTML artifacts:
+  * listFiles() - Returns array of {id, fileName, mimeType, size} for all attachments
+  * readTextFile(attachmentId) - Returns text content of attachment (for CSV, JSON, text files)
+  * readBinaryFile(attachmentId) - Returns Uint8Array of binary data (for images, Excel, etc.)
+- Example HTML artifact that processes a CSV attachment:
+  <script>
+    // List available files
+    const files = listFiles();
+    console.log('Available files:', files);
+
+    // Find CSV file
+    const csvFile = files.find(f => f.mimeType === 'text/csv');
+    if (csvFile) {
+      const csvContent = readTextFile(csvFile.id);
+      // Process CSV data...
+    }
+
+    // Display image
+    const imageFile = files.find(f => f.mimeType.startsWith('image/'));
+    if (imageFile) {
+      const bytes = readBinaryFile(imageFile.id);
+      const blob = new Blob([bytes], {type: imageFile.mimeType});
+      const url = URL.createObjectURL(blob);
+      document.body.innerHTML = '<img src="' + url + '">';
+    }
+  </script>
+
+For text/html artifacts:
+- Must be a single self-contained file
+- External scripts: Use CDNs like https://esm.sh, https://unpkg.com, or https://cdnjs.cloudflare.com
+- Preferred: Use https://esm.sh for npm packages (e.g., https://esm.sh/three for Three.js)
+- For ES modules, use: <script type="module">import * as THREE from 'https://esm.sh/three';</script>
+- For Three.js specifically: import from 'https://esm.sh/three' or 'https://esm.sh/three@0.160.0'
+- For addons: import from 'https://esm.sh/three/examples/jsm/controls/OrbitControls.js'
+- No localStorage/sessionStorage - use in-memory variables only
+- CSS should be included inline
+- CRITICAL REMINDER FOR HTML ARTIFACTS:
+	- ALWAYS set a background color inline in <style> or directly on body element
+	- Failure to set a background color is a COMPLIANCE ERROR
+	- Background color MUST be explicitly defined to ensure visibility and proper rendering
+- Can embed base64 images directly in img tags
+- Ensure the layout is responsive as the iframe might be resized
+- Note: Network errors (404s) for external scripts may not be captured in logs due to browser security
+
+For application/vnd.ant.code artifacts:
+- Include the language parameter for syntax highlighting
+- Supports all major programming languages
+
+For text/markdown:
+- Standard markdown syntax
+- Will be rendered with full formatting
+- Can include base64 images using markdown syntax
+
+For image/svg+xml:
+- Complete SVG markup
+- Will be rendered inline
+- Can embed raster images as base64 in SVG
+
+CRITICAL REMINDER FOR ALL ARTIFACTS:
+- Prefer to update existing files rather than creating new ones
+- Keep filenames consistent and descriptive
+- Use appropriate file extensions
+- Ensure HTML artifacts have a defined background color
+`,
+			parameters: artifactsParamsSchema,
+			// Execute mutates our local store and returns a plain output
+			execute: async (_toolCallId: string, args: Static<typeof artifactsParamsSchema>, _signal?: AbortSignal) => {
+				const output = await this.executeCommand(args);
+				return { output, details: undefined };
+			},
+		};
+	}
+
+	// ToolRenderer implementation
+	renderParams(params: ArtifactsParams, isStreaming?: boolean): TemplateResult {
+		if (isStreaming && !params.command) {
+			return html`<div class="text-sm text-muted-foreground">${i18n("Processing artifact...")}</div>`;
+		}
+
+		let commandLabel = i18n("Processing");
+		if (params.command) {
+			switch (params.command) {
+				case "create":
+					commandLabel = i18n("Create");
+					break;
+				case "update":
+					commandLabel = i18n("Update");
+					break;
+				case "rewrite":
+					commandLabel = i18n("Rewrite");
+					break;
+				case "get":
+					commandLabel = i18n("Get");
+					break;
+				case "delete":
+					commandLabel = i18n("Delete");
+					break;
+				case "logs":
+					commandLabel = i18n("Get logs");
+					break;
+				default:
+					commandLabel = params.command.charAt(0).toUpperCase() + params.command.slice(1);
+			}
+		}
+		const filename = params.filename || "";
+
+		switch (params.command) {
+			case "create":
+				return html`
+					<div
+						class="text-sm cursor-pointer hover:bg-muted/50 rounded-sm px-2 py-1"
+						@click=${() => this.openArtifact(params.filename)}
+					>
+						<div>
+							<span class="font-medium">${i18n("Create")}</span>
+							<span class="text-muted-foreground ml-1">${filename}</span>
+						</div>
+						${
+							params.content
+								? html`<code-block
+									.code=${params.content}
+									language=${this.getLanguageFromFilename(params.filename)}
+									class="mt-2"
+								></code-block>`
+								: ""
+						}
+					</div>
+				`;
+			case "update":
+				return html`
+					<div
+						class="text-sm cursor-pointer hover:bg-muted/50 rounded-sm px-2 py-1"
+						@click=${() => this.openArtifact(params.filename)}
+					>
+						<div>
+							<span class="font-medium">${i18n("Update")}</span>
+							<span class="text-muted-foreground ml-1">${filename}</span>
+						</div>
+						${
+							params.old_str !== undefined && params.new_str !== undefined
+								? Diff({ oldText: params.old_str, newText: params.new_str, className: "mt-2" })
+								: ""
+						}
+					</div>
+				`;
+			case "rewrite":
+				return html`
+					<div
+						class="text-sm cursor-pointer hover:bg-muted/50 rounded-sm px-2 py-1"
+						@click=${() => this.openArtifact(params.filename)}
+					>
+						<div>
+							<span class="font-medium">${i18n("Rewrite")}</span>
+							<span class="text-muted-foreground ml-1">${filename}</span>
+						</div>
+						${
+							params.content
+								? html`<code-block
+									.code=${params.content}
+									language=${this.getLanguageFromFilename(params.filename)}
+									class="mt-2"
+								></code-block>`
+								: ""
+						}
+					</div>
+				`;
+			case "get":
+				return html`
+					<div
+						class="text-sm cursor-pointer hover:bg-muted/50 rounded-sm px-2 py-1"
+						@click=${() => this.openArtifact(params.filename)}
+					>
+						<span class="font-medium">${i18n("Get")}</span>
+						<span class="text-muted-foreground ml-1">${filename}</span>
+					</div>
+				`;
+			case "delete":
+				return html`
+					<div
+						class="text-sm cursor-pointer hover:bg-muted/50 rounded-sm px-2 py-1"
+						@click=${() => this.openArtifact(params.filename)}
+					>
+						<span class="font-medium">${i18n("Delete")}</span>
+						<span class="text-muted-foreground ml-1">${filename}</span>
+					</div>
+				`;
+			case "logs":
+				return html`
+					<div
+						class="text-sm cursor-pointer hover:bg-muted/50 rounded-sm px-2 py-1"
+						@click=${() => this.openArtifact(params.filename)}
+					>
+						<span class="font-medium">${i18n("Get logs")}</span>
+						<span class="text-muted-foreground ml-1">${filename}</span>
+					</div>
+				`;
+			default:
+				// Fallback for any command not yet handled during streaming
+				return html`
+					<div
+						class="text-sm cursor-pointer hover:bg-muted/50 rounded-sm px-2 py-1"
+						@click=${() => this.openArtifact(params.filename)}
+					>
+						<span class="font-medium">${commandLabel}</span>
+						<span class="text-muted-foreground ml-1">${filename}</span>
+					</div>
+				`;
+		}
+	}
+
+	renderResult(params: ArtifactsParams, result: ToolResultMessage<undefined>): TemplateResult {
+		// Make result clickable to focus the referenced file when applicable
+		const content = result.output || i18n("(no output)");
+		return html`
+			<div class="cursor-pointer hover:bg-muted/50 rounded-sm px-2 py-1" @click=${() => this.openArtifact(params.filename)}>
+				${plainOutput(content)}
+			</div>
+		`;
+	}
+
+	// Re-apply artifacts by scanning a message list (optional utility)
+	public async reconstructFromMessages(messages: Array<Message | { role: "aborted" }>): Promise<void> {
+		const toolCalls = new Map<string, ToolCall>();
+		const artifactToolName = "artifacts";
+
+		// 1) Collect tool calls from assistant messages
+		for (const message of messages) {
+			if (message.role === "assistant") {
+				for (const block of message.content) {
+					if (block.type === "toolCall" && block.name === artifactToolName) {
+						toolCalls.set(block.id, block);
+					}
+				}
+			}
+		}
+
+		// 2) Build an ordered list of successful artifact operations
+		const operations: Array<ArtifactsParams> = [];
+		for (const m of messages) {
+			if ((m as any).role === "toolResult" && (m as any).toolName === artifactToolName && !(m as any).isError) {
+				const toolCallId = (m as any).toolCallId as string;
+				const call = toolCalls.get(toolCallId);
+				if (!call) continue;
+				const params = call.arguments as ArtifactsParams;
+				if (params.command === "get" || params.command === "logs") continue; // no state change
+				operations.push(params);
+			}
+		}
+
+		// 3) Compute final state per filename by simulating operations in-memory
+		type FinalArtifact = { title: string; content: string };
+		const finalArtifacts = new Map<string, FinalArtifact>();
+		for (const op of operations) {
+			const filename = op.filename;
+			switch (op.command) {
+				case "create": {
+					if (op.content) {
+						finalArtifacts.set(filename, { title: op.title || filename, content: op.content });
+					}
+					break;
+				}
+				case "rewrite": {
+					if (op.content) {
+						// If file didn't exist earlier but rewrite succeeded, treat as fresh content
+						const existing = finalArtifacts.get(filename);
+						finalArtifacts.set(filename, { title: op.title || existing?.title || filename, content: op.content });
+					}
+					break;
+				}
+				case "update": {
+					const existing = finalArtifacts.get(filename);
+					if (!existing) break; // skip invalid update (shouldn't happen for successful results)
+					if (op.old_str !== undefined && op.new_str !== undefined) {
+						existing.content = existing.content.replace(op.old_str, op.new_str);
+						finalArtifacts.set(filename, existing);
+					}
+					break;
+				}
+				case "delete": {
+					finalArtifacts.delete(filename);
+					break;
+				}
+				case "get":
+				case "logs":
+					// Ignored above, just for completeness
+					break;
+			}
+		}
+
+		// 4) Reset current UI state before bulk create
+		this._artifacts.clear();
+		this.artifactElements.forEach((el) => {
+			el.remove();
+		});
+		this.artifactElements.clear();
+		this._activeFilename = null;
+		this._artifacts = new Map(this._artifacts);
+
+		// 5) Create artifacts in a single pass without waiting for iframe execution or tab switching
+		for (const [filename, { title, content }] of finalArtifacts.entries()) {
+			const createParams: ArtifactsParams = { command: "create", filename, title, content } as const;
+			try {
+				await this.createArtifact(createParams, { skipWait: true, silent: true });
+			} catch {
+				// Ignore failures during reconstruction
+			}
+		}
+
+		// 6) Show first artifact if any exist, and notify listeners once
+		if (!this._activeFilename && this._artifacts.size > 0) {
+			this.showArtifact(Array.from(this._artifacts.keys())[0]);
+		}
+		this.onArtifactsChange?.();
+		this.requestUpdate();
+	}
+
+	// Core command executor
+	private async executeCommand(
+		params: ArtifactsParams,
+		options: { skipWait?: boolean; silent?: boolean } = {},
+	): Promise<string> {
+		switch (params.command) {
+			case "create":
+				return await this.createArtifact(params, options);
+			case "update":
+				return await this.updateArtifact(params, options);
+			case "rewrite":
+				return await this.rewriteArtifact(params, options);
+			case "get":
+				return this.getArtifact(params);
+			case "delete":
+				return this.deleteArtifact(params);
+			case "logs":
+				return this.getLogs(params);
+			default:
+				// Should never happen with TypeBox validation
+				return `Error: Unknown command ${(params as any).command}`;
+		}
+	}
+
+	// Wait for HTML artifact execution and get logs
+	private async waitForHtmlExecution(filename: string): Promise<string> {
+		const element = this.artifactElements.get(filename);
+		if (!(element instanceof HtmlArtifact)) {
+			return "";
+		}
+
+		return new Promise((resolve) => {
+			let resolved = false;
+
+			// Listen for the execution-complete message
+			const messageHandler = (event: MessageEvent) => {
+				if (event.data?.type === "execution-complete" && event.data?.artifactId === filename) {
+					if (!resolved) {
+						resolved = true;
+						window.removeEventListener("message", messageHandler);
+
+						// Get the logs from the element
+						const logs = element.getLogs();
+						if (logs.includes("[error]")) {
+							resolve(`\n\nExecution completed with errors:\n${logs}`);
+						} else if (logs !== `No logs for ${filename}`) {
+							resolve(`\n\nExecution logs:\n${logs}`);
+						} else {
+							resolve("");
+						}
+					}
+				}
+			};
+
+			window.addEventListener("message", messageHandler);
+
+			// Fallback timeout in case the message never arrives
+			setTimeout(() => {
+				if (!resolved) {
+					resolved = true;
+					window.removeEventListener("message", messageHandler);
+
+					// Get whatever logs we have so far
+					const logs = element.getLogs();
+					if (logs.includes("[error]")) {
+						resolve(`\n\nExecution timed out with errors:\n${logs}`);
+					} else if (logs !== `No logs for ${filename}`) {
+						resolve(`\n\nExecution timed out. Partial logs:\n${logs}`);
+					} else {
+						resolve("");
+					}
+				}
+			}, 1500);
+		});
+	}
+
+	private async createArtifact(
+		params: ArtifactsParams,
+		options: { skipWait?: boolean; silent?: boolean } = {},
+	): Promise<string> {
+		if (!params.filename || !params.content) {
+			return "Error: create command requires filename and content";
+		}
+		if (this._artifacts.has(params.filename)) {
+			return `Error: File ${params.filename} already exists`;
+		}
+
+		const title = params.title || params.filename;
+		const artifact: Artifact = {
+			filename: params.filename,
+			title: title,
+			content: params.content,
+			createdAt: new Date(),
+			updatedAt: new Date(),
+		};
+		this._artifacts.set(params.filename, artifact);
+		this._artifacts = new Map(this._artifacts);
+
+		// Create or update element
+		this.getOrCreateArtifactElement(params.filename, params.content, title);
+		if (!options.silent) {
+			this.showArtifact(params.filename);
+			this.onArtifactsChange?.();
+			this.requestUpdate();
+		}
+
+		// For HTML files, wait for execution
+		let result = `Created file ${params.filename}`;
+		if (this.getFileType(params.filename) === "html" && !options.skipWait) {
+			const logs = await this.waitForHtmlExecution(params.filename);
+			result += logs;
+		}
+
+		return result;
+	}
+
+	private async updateArtifact(
+		params: ArtifactsParams,
+		options: { skipWait?: boolean; silent?: boolean } = {},
+	): Promise<string> {
+		const artifact = this._artifacts.get(params.filename);
+		if (!artifact) {
+			const files = Array.from(this._artifacts.keys());
+			if (files.length === 0) return `Error: File ${params.filename} not found. No files have been created yet.`;
+			return `Error: File ${params.filename} not found. Available files: ${files.join(", ")}`;
+		}
+		if (!params.old_str || params.new_str === undefined) {
+			return "Error: update command requires old_str and new_str";
+		}
+		if (!artifact.content.includes(params.old_str)) {
+			return `Error: String not found in file. Here is the full content:\n\n${artifact.content}`;
+		}
+
+		artifact.content = artifact.content.replace(params.old_str, params.new_str);
+		artifact.updatedAt = new Date();
+		this._artifacts.set(params.filename, artifact);
+
+		// Update element
+		this.getOrCreateArtifactElement(params.filename, artifact.content, artifact.title);
+		if (!options.silent) {
+			this.onArtifactsChange?.();
+			this.requestUpdate();
+		}
+
+		// Show the artifact
+		this.showArtifact(params.filename);
+
+		// For HTML files, wait for execution
+		let result = `Updated file ${params.filename}`;
+		if (this.getFileType(params.filename) === "html" && !options.skipWait) {
+			const logs = await this.waitForHtmlExecution(params.filename);
+			result += logs;
+		}
+
+		return result;
+	}
+
+	private async rewriteArtifact(
+		params: ArtifactsParams,
+		options: { skipWait?: boolean; silent?: boolean } = {},
+	): Promise<string> {
+		const artifact = this._artifacts.get(params.filename);
+		if (!artifact) {
+			const files = Array.from(this._artifacts.keys());
+			if (files.length === 0) return `Error: File ${params.filename} not found. No files have been created yet.`;
+			return `Error: File ${params.filename} not found. Available files: ${files.join(", ")}`;
+		}
+		if (!params.content) {
+			return "Error: rewrite command requires content";
+		}
+
+		artifact.content = params.content;
+		if (params.title) artifact.title = params.title;
+		artifact.updatedAt = new Date();
+		this._artifacts.set(params.filename, artifact);
+
+		// Update element
+		this.getOrCreateArtifactElement(params.filename, artifact.content, artifact.title);
+		if (!options.silent) {
+			this.onArtifactsChange?.();
+		}
+
+		// Show the artifact
+		this.showArtifact(params.filename);
+
+		// For HTML files, wait for execution
+		let result = `Rewrote file ${params.filename}`;
+		if (this.getFileType(params.filename) === "html" && !options.skipWait) {
+			const logs = await this.waitForHtmlExecution(params.filename);
+			result += logs;
+		}
+
+		return result;
+	}
+
+	private getArtifact(params: ArtifactsParams): string {
+		const artifact = this._artifacts.get(params.filename);
+		if (!artifact) {
+			const files = Array.from(this._artifacts.keys());
+			if (files.length === 0) return `Error: File ${params.filename} not found. No files have been created yet.`;
+			return `Error: File ${params.filename} not found. Available files: ${files.join(", ")}`;
+		}
+		return artifact.content;
+	}
+
+	private deleteArtifact(params: ArtifactsParams): string {
+		const artifact = this._artifacts.get(params.filename);
+		if (!artifact) {
+			const files = Array.from(this._artifacts.keys());
+			if (files.length === 0) return `Error: File ${params.filename} not found. No files have been created yet.`;
+			return `Error: File ${params.filename} not found. Available files: ${files.join(", ")}`;
+		}
+
+		this._artifacts.delete(params.filename);
+		this._artifacts = new Map(this._artifacts);
+
+		// Remove element
+		const element = this.artifactElements.get(params.filename);
+		if (element) {
+			element.remove();
+			this.artifactElements.delete(params.filename);
+		}
+
+		// Show another artifact if this was active
+		if (this._activeFilename === params.filename) {
+			const remaining = Array.from(this._artifacts.keys());
+			if (remaining.length > 0) {
+				this.showArtifact(remaining[0]);
+			} else {
+				this._activeFilename = null;
+				this.requestUpdate();
+			}
+		}
+		this.onArtifactsChange?.();
+		this.requestUpdate();
+
+		return `Deleted file ${params.filename}`;
+	}
+
+	private getLogs(params: ArtifactsParams): string {
+		const element = this.artifactElements.get(params.filename);
+		if (!element) {
+			const files = Array.from(this._artifacts.keys());
+			if (files.length === 0) return `Error: File ${params.filename} not found. No files have been created yet.`;
+			return `Error: File ${params.filename} not found. Available files: ${files.join(", ")}`;
+		}
+
+		if (!(element instanceof HtmlArtifact)) {
+			return `Error: File ${params.filename} is not an HTML file. Logs are only available for HTML files.`;
+		}
+
+		return element.getLogs();
+	}
+
+	override render(): TemplateResult {
+		const artifacts = Array.from(this._artifacts.values());
+
+		// Panel is hidden when collapsed OR when there are no artifacts
+		const showPanel = artifacts.length > 0 && !this.collapsed;
+
+		return html`
+			<div
+				class="${showPanel ? "" : "hidden"} ${
+					this.overlay ? "fixed inset-0 z-40 pointer-events-auto backdrop-blur-sm bg-background/95" : "relative"
+				} h-full flex flex-col bg-background text-card-foreground ${
+					!this.overlay ? "border-l border-border" : ""
+				} overflow-hidden shadow-xl"
+			>
+				<!-- Tab bar (always shown when there are artifacts) -->
+				<div class="flex items-center justify-between border-b border-border bg-background">
+					<div class="flex overflow-x-auto">
+						${artifacts.map((a) => {
+							const isActive = a.filename === this._activeFilename;
+							const activeClass = isActive
+								? "border-primary text-primary"
+								: "border-transparent text-muted-foreground hover:text-foreground";
+							return html`
+								<button
+									class="px-3 py-2 whitespace-nowrap border-b-2 ${activeClass}"
+									@click=${() => this.showArtifact(a.filename)}
+								>
+									<span class="font-mono text-xs">${a.filename}</span>
+								</button>
+							`;
+						})}
+					</div>
+					<div class="flex items-center gap-1 px-2">
+						${(() => {
+							const active = this._activeFilename ? this.artifactElements.get(this._activeFilename) : undefined;
+							return active ? active.getHeaderButtons() : "";
+						})()}
+						${Button({
+							variant: "ghost",
+							size: "sm",
+							onClick: () => this.onClose?.(),
+							title: i18n("Close artifacts"),
+							children: icon(X, "sm"),
+						})}
+					</div>
+				</div>
+
+				<!-- Content area where artifact elements are added programmatically -->
+				<div class="flex-1 overflow-hidden" ${ref(this.contentRef)}></div>
+			</div>
+		`;
+	}
+}
+
+declare global {
+	interface HTMLElementTagNameMap {
+		"artifacts-panel": ArtifactsPanel;
+	}
+}

packages/web-ui/src/tools/artifacts/index.ts

@@ -0,0 +1,6 @@
+export { ArtifactElement } from "./ArtifactElement.js";
+export { type Artifact, ArtifactsPanel, type ArtifactsParams } from "./artifacts.js";
+export { HtmlArtifact } from "./HtmlArtifact.js";
+export { MarkdownArtifact } from "./MarkdownArtifact.js";
+export { SvgArtifact } from "./SvgArtifact.js";
+export { TextArtifact } from "./TextArtifact.js";

packages/web-ui/src/tools/renderer-registry.ts

@@ -0,0 +1,18 @@
+import type { ToolRenderer } from "./types.js";
+
+// Registry of tool renderers
+export const toolRenderers = new Map<string, ToolRenderer>();
+
+/**
+ * Register a custom tool renderer
+ */
+export function registerToolRenderer(toolName: string, renderer: ToolRenderer): void {
+	toolRenderers.set(toolName, renderer);
+}
+
+/**
+ * Get a tool renderer by name
+ */
+export function getToolRenderer(toolName: string): ToolRenderer | undefined {
+	return toolRenderers.get(toolName);
+}

packages/web-ui/src/tools/renderers/BashRenderer.ts

@@ -0,0 +1,45 @@
+import { html, type TemplateResult } from "@mariozechner/mini-lit";
+import type { ToolResultMessage } from "@mariozechner/pi-ai";
+import { i18n } from "../../utils/i18n.js";
+import type { ToolRenderer } from "../types.js";
+
+interface BashParams {
+	command: string;
+}
+
+// Bash tool has undefined details (only uses output)
+export class BashRenderer implements ToolRenderer<BashParams, undefined> {
+	renderParams(params: BashParams, isStreaming?: boolean): TemplateResult {
+		if (isStreaming && (!params.command || params.command.length === 0)) {
+			return html`<div class="text-sm text-muted-foreground">${i18n("Writing command...")}</div>`;
+		}
+
+		return html`
+			<div class="text-sm text-muted-foreground">
+				<span>${i18n("Running command:")}</span>
+				<code class="ml-1 px-1.5 py-0.5 bg-muted rounded text-xs font-mono">${params.command}</code>
+			</div>
+		`;
+	}
+
+	renderResult(_params: BashParams, result: ToolResultMessage<undefined>): TemplateResult {
+		const output = result.output || "";
+		const isError = result.isError === true;
+
+		if (isError) {
+			return html`
+				<div class="text-sm">
+					<div class="text-destructive font-medium mb-1">${i18n("Command failed:")}</div>
+					<pre class="text-xs font-mono text-destructive bg-destructive/10 p-2 rounded overflow-x-auto">${output}</pre>
+				</div>
+			`;
+		}
+
+		// Display the command output
+		return html`
+			<div class="text-sm">
+				<pre class="text-xs font-mono text-foreground bg-muted/50 p-2 rounded overflow-x-auto">${output}</pre>
+			</div>
+		`;
+	}
+}

packages/web-ui/src/tools/renderers/CalculateRenderer.ts

@@ -0,0 +1,49 @@
+import { html, type TemplateResult } from "@mariozechner/mini-lit";
+import type { ToolResultMessage } from "@mariozechner/pi-ai";
+import { i18n } from "../../utils/i18n.js";
+import type { ToolRenderer } from "../types.js";
+
+interface CalculateParams {
+	expression: string;
+}
+
+// Calculate tool has undefined details (only uses output)
+export class CalculateRenderer implements ToolRenderer<CalculateParams, undefined> {
+	renderParams(params: CalculateParams, isStreaming?: boolean): TemplateResult {
+		if (isStreaming && !params.expression) {
+			return html`<div class="text-sm text-muted-foreground">${i18n("Writing expression...")}</div>`;
+		}
+
+		return html`
+			<div class="text-sm text-muted-foreground">
+				<span>${i18n("Calculating")}</span>
+				<code class="mx-1 px-1.5 py-0.5 bg-muted rounded text-xs font-mono">${params.expression}</code>
+			</div>
+		`;
+	}
+
+	renderResult(_params: CalculateParams, result: ToolResultMessage<undefined>): TemplateResult {
+		// Parse the output to make it look nicer
+		const output = result.output || "";
+		const isError = result.isError === true;
+
+		if (isError) {
+			return html`<div class="text-sm text-destructive">${output}</div>`;
+		}
+
+		// Try to split on = to show expression and result separately
+		const parts = output.split(" = ");
+		if (parts.length === 2) {
+			return html`
+				<div class="text-sm font-mono">
+					<span class="text-muted-foreground">${parts[0]}</span>
+					<span class="text-muted-foreground mx-1">=</span>
+					<span class="text-foreground font-semibold">${parts[1]}</span>
+				</div>
+			`;
+		}
+
+		// Fallback to showing the whole output
+		return html`<div class="text-sm font-mono text-foreground">${output}</div>`;
+	}
+}

packages/web-ui/src/tools/renderers/DefaultRenderer.ts

@@ -0,0 +1,36 @@
+import { html, type TemplateResult } from "@mariozechner/mini-lit";
+import type { ToolResultMessage } from "@mariozechner/pi-ai";
+import { i18n } from "../../utils/i18n.js";
+import type { ToolRenderer } from "../types.js";
+
+export class DefaultRenderer implements ToolRenderer {
+	renderParams(params: any, isStreaming?: boolean): TemplateResult {
+		let text: string;
+		let isJson = false;
+
+		try {
+			text = JSON.stringify(JSON.parse(params), null, 2);
+			isJson = true;
+		} catch {
+			try {
+				text = JSON.stringify(params, null, 2);
+				isJson = true;
+			} catch {
+				text = String(params);
+			}
+		}
+
+		if (isStreaming && (!text || text === "{}" || text === "null")) {
+			return html`<div class="text-sm text-muted-foreground">${i18n("Preparing tool parameters...")}</div>`;
+		}
+
+		return html`<console-block .content=${text}></console-block>`;
+	}
+
+	renderResult(_params: any, result: ToolResultMessage): TemplateResult {
+		// Just show the output field - that's what was sent to the LLM
+		const text = result.output || i18n("(no output)");
+
+		return html`<div class="text-sm text-muted-foreground whitespace-pre-wrap font-mono">${text}</div>`;
+	}
+}

packages/web-ui/src/tools/renderers/GetCurrentTimeRenderer.ts

@@ -0,0 +1,39 @@
+import { html, type TemplateResult } from "@mariozechner/mini-lit";
+import type { ToolResultMessage } from "@mariozechner/pi-ai";
+import { i18n } from "../../utils/i18n.js";
+import type { ToolRenderer } from "../types.js";
+
+interface GetCurrentTimeParams {
+	timezone?: string;
+}
+
+// GetCurrentTime tool has undefined details (only uses output)
+export class GetCurrentTimeRenderer implements ToolRenderer<GetCurrentTimeParams, undefined> {
+	renderParams(params: GetCurrentTimeParams, isStreaming?: boolean): TemplateResult {
+		if (params.timezone) {
+			return html`
+				<div class="text-sm text-muted-foreground">
+					<span>${i18n("Getting current time in")}</span>
+					<code class="mx-1 px-1.5 py-0.5 bg-muted rounded text-xs font-mono">${params.timezone}</code>
+				</div>
+			`;
+		}
+		return html`
+			<div class="text-sm text-muted-foreground">
+				<span>${i18n("Getting current date and time")}${isStreaming ? "..." : ""}</span>
+			</div>
+		`;
+	}
+
+	renderResult(_params: GetCurrentTimeParams, result: ToolResultMessage<undefined>): TemplateResult {
+		const output = result.output || "";
+		const isError = result.isError === true;
+
+		if (isError) {
+			return html`<div class="text-sm text-destructive">${output}</div>`;
+		}
+
+		// Display the date/time result
+		return html`<div class="text-sm font-mono text-foreground">${output}</div>`;
+	}
+}

packages/web-ui/src/tools/types.ts

@@ -0,0 +1,7 @@
+import type { ToolResultMessage } from "@mariozechner/pi-ai";
+import type { TemplateResult } from "lit";
+
+export interface ToolRenderer<TParams = any, TDetails = any> {
+	renderParams(params: TParams, isStreaming?: boolean): TemplateResult;
+	renderResult(params: TParams, result: ToolResultMessage<TDetails>): TemplateResult;
+}