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type ReactNode,
useState,
lazy,
Suspense,
type LazyExoticComponent,
type ComponentType,
type JSX,
} from "react";
import { ChevronDown, ChevronRight } from "lucide-react";
import Markdown, { type Components, type ExtraProps } from "react-markdown";
import rehypePrismPlus from "rehype-prism-plus/common";
import remarkGfm from "remark-gfm";
import type { SessionEvent } from "../../hooks/types.js";
import { detectDelegation, delegationIdentityKey, deriveChildSessionId } from "@grackle-ai/common";
import { formatTokens, formatCost } from "../../utils/format.js";
import { ICON_SM } from "../../utils/iconSize.js";
import { ToolCard } from "../tools/ToolCard.js";
import type { McpAppWidgetProps } from "./McpAppWidget.js";
import type { McpUiResourceCsp } from "@modelcontextprotocol/ext-apps/app-bridge";
import type { CallToolResult } from "@modelcontextprotocol/sdk/types.js";
import { CopyButton } from "./CopyButton.js";
import styles from "./EventRenderer.module.scss";
// Lazy-loaded (and intentionally NOT re-exported from the package barrel) so the
// heavy ext-apps AppBridge is code-split into an async chunk loaded only when a
// widget actually renders — keeps the main chat bundle under the chunk-size cap.
const McpAppWidget: LazyExoticComponent<ComponentType<McpAppWidgetProps>> = lazy(() =>
import("./McpAppWidget.js").then((m) => ({ default: m.McpAppWidget })),
);
/** Props for the EventRenderer component. */
interface Props {
event: SessionEvent;
/** Paired tool_use context, attached by SessionPanel when raw IDs match. */
toolUseCtx?: { tool: string; args: unknown; detailedResult?: string };
/** True when a tool_use completed but has no tool_result (e.g. Claude Code text-result pattern). */
settled?: boolean;
/** Sandbox proxy origin URL for rendering MCP Apps widget events (different origin than the app). */
sandboxProxyUrl?: string;
/** Open a file in the live-docs pane (#1396) — makes `file://` links and tool file paths clickable. */
onOpenDocument?: (uri: string) => void;
}
/**
* Compute the materialized child session id for a delegation tool call, using
* the same shared derivation the server uses to create the child (#1075), so the
* agent card can link to the subagent's activity view. Returns undefined for
* non-delegation tools or when the parent session / tool-call id is unknown.
*/
function delegationChildId(
parentSessionId: string,
toolCallId: string | undefined,
tool: string,
args: unknown,
): string | undefined {
if (!parentSessionId || !toolCallId) {
return undefined;
}
const info = detectDelegation(tool, args);
Iif (!info) {
return undefined;
}
return deriveChildSessionId(parentSessionId, delegationIdentityKey(info, toolCallId));
}
// --- Individual event type renderers ---
/** Number of lines shown in the collapsed system context preview. */
const SYSTEM_CONTEXT_PREVIEW_LINES: number = 3;
/** Renders the system context (system prompt) as a collapsible left-bordered section. */
function SystemContextEvent({ content }: { content: string }): JSX.Element {
const [expanded, setExpanded] = useState(false);
const lines = content.split("\n");
const hasMore = lines.length > SYSTEM_CONTEXT_PREVIEW_LINES;
const displayContent = expanded
? content
: lines.slice(0, SYSTEM_CONTEXT_PREVIEW_LINES).join("\n");
return (
<div className={styles.systemContextEvent} data-testid="system-context-event">
<button
type="button"
className={styles.systemContextHeader}
onClick={() => {
setExpanded((v) => !v);
}}
aria-expanded={expanded}
>
<span className={styles.systemContextBadge}>SYSTEM PROMPT</span>
{hasMore && (
<span className={styles.systemContextToggle} aria-hidden="true">
{expanded ? <ChevronDown size={ICON_SM} /> : <ChevronRight size={ICON_SM} />}
</span>
)}
</button>
<pre className={styles.systemContextPre}>
{displayContent}
{!expanded && hasMore && <span className={styles.systemContextEllipsis}>{"\u2026"}</span>}
</pre>
</div>
);
}
/** Renders a system-level event with timestamp. */
function SystemEvent({ time, content }: { time: string; content: string }): JSX.Element {
return (
<div className={styles.systemEvent}>
<span className={styles.systemTimestamp}>[{time}]</span> {content}
</div>
);
}
/** Recursively extracts plain text from React children (for code block copy). */
export function extractText(node: ReactNode): string {
if (typeof node === "string") {
return node;
}
Iif (typeof node === "number") {
return String(node);
}
if (Array.isArray(node)) {
return node.map(extractText).join("");
}
if (node !== null && node !== undefined && typeof node === "object" && "props" in node) {
return extractText((node as { props: { children?: ReactNode } }).props.children);
}
return "";
}
/** Props passed by react-markdown to component overrides. */
interface PreProps extends React.HTMLAttributes<HTMLPreElement> {
children?: ReactNode;
/** AST node injected by react-markdown — must not be spread onto the DOM element. */
node?: unknown;
}
/** Wraps markdown `<pre>` blocks with a CopyButton for code-only copy. */
function CodeBlockWrapper({ children, node, ...preProps }: PreProps): JSX.Element {
// node is destructured solely to exclude it from the DOM spread
Iif (node === undefined) {
/* intentionally unused */
}
const rawText = extractText(children);
return (
<div className={styles.codeBlockWrapper}>
<pre {...preProps}>{children}</pre>
<CopyButton
text={rawText}
data-testid="copy-code-block"
className={styles.codeBlockCopyButton}
/>
</div>
);
}
/**
* Renders a markdown string with GFM support and syntax-highlighted code blocks.
*
* Shared by both assistant text events and user input events so the two render
* through an identical pipeline. When `onOpenDocument` is provided, `file://`
* links open in the live-docs pane instead of navigating (#1396).
*/
function MarkdownContent({
content,
onOpenDocument,
}: {
content: string;
onOpenDocument?: (uri: string) => void;
}): JSX.Element {
const components: Components = {
pre: CodeBlockWrapper,
a(props: JSX.IntrinsicElements["a"] & ExtraProps) {
const { href, children } = props;
Iif (href && href.startsWith("file://") && onOpenDocument) {
return (
<a
href={href}
onClick={(e) => {
e.preventDefault();
onOpenDocument(href);
}}
>
{children}
</a>
);
}
return (
<a href={href} target="_blank" rel="noreferrer noopener">
{children}
</a>
);
},
};
return (
<Markdown remarkPlugins={[remarkGfm]} rehypePlugins={[rehypePrismPlus]} components={components}>
{content}
</Markdown>
);
}
/** Renders an assistant text output event with markdown formatting. */
function TextEvent({
content,
onOpenDocument,
}: {
content: string;
onOpenDocument?: (uri: string) => void;
}): JSX.Element {
return (
<div className={styles.textEvent}>
<MarkdownContent content={content} onOpenDocument={onOpenDocument} />
</div>
);
}
// ToolUseEvent and ToolResultEvent have been replaced by the ToolCard component
// in packages/web/src/components/tools/. See ToolCard.tsx for the router and
// individual card components (FileReadCard, FileEditCard, ShellCard, etc.).
/** Renders an error event with red styling. */
function ErrorEvent({ content }: { content: string }): JSX.Element {
return <div className={styles.errorEvent}>Error: {content}</div>;
}
/** Renders a status change event with separator lines. */
function StatusEvent({ content }: { content: string }): JSX.Element {
return <div className={styles.statusEvent}>--- {content} ---</div>;
}
/** Renders a user input event as markdown, right-aligned to distinguish it from agent output. */
function UserInputEvent({ content }: { content: string }): JSX.Element {
return (
<div className={styles.userInputEvent}>
<div className={styles.userInputContent} data-testid="user-input-content">
<MarkdownContent content={content} />
</div>
</div>
);
}
/** Renders a signal event (e.g. SIGCHLD) as a left-bordered banner. */
function SignalEvent({ content }: { content: string }): JSX.Element {
return (
<div className={styles.signalEvent} data-testid="signal-event">
<span className={styles.signalBadge}>SIGNAL</span>
<span className={styles.signalContent}>{content}</span>
</div>
);
}
/** Renders a usage event as a compact cost badge. */
function UsageEvent({ content }: { content: string }): JSX.Element {
let label = content;
try {
const data = JSON.parse(content) as Record<string, unknown>;
const inTok = Number(data.input_tokens) || 0;
const outTok = Number(data.output_tokens) || 0;
const tokens = formatTokens(inTok + outTok);
const cost = formatCost(Number(data.cost_millicents) || 0);
label = `${tokens} tokens \u00b7 ${cost}`;
} catch {
/* show raw content if JSON fails */
}
return (
<div className={styles.usageEvent} data-testid="usage-event">
<span className={styles.usageBadge}>{label}</span>
</div>
);
}
/** Renders an unrecognized event type. */
function DefaultEvent({ content }: { content: string }): JSX.Element {
return <div className={styles.defaultEvent}>{content}</div>;
}
// --- Main component ---
/** Renders a single session event, dispatching to the appropriate type-specific renderer. */
export function EventRenderer({
event,
toolUseCtx,
settled,
sandboxProxyUrl,
onOpenDocument,
}: Props): JSX.Element {
const time = new Date(event.timestamp).toLocaleTimeString();
switch (event.eventType) {
case "widget": {
// MCP Apps widget event (pushed by the broker). Self-contained: HTML +
// tool input/result. Renders in the cross-origin sandbox via McpAppWidget.
Iif (!sandboxProxyUrl) {
return <DefaultEvent content={event.content} />;
}
let payload: {
html?: string;
rendererKind?: string;
// `allowInlineScripts`/`allowUnsafeEval` are Grackle extensions to the
// upstream CSP type (agent-authored widgets #1239; React runtime #1268);
// forwarded verbatim to the sandbox.
csp?: McpUiResourceCsp & { allowInlineScripts?: boolean; allowUnsafeEval?: boolean };
toolInput?: Record<string, unknown>;
toolResult?: CallToolResult;
// Resolved registry dependencies for composition (#1270), eval order.
components?: Array<{ name: string; body: string }>;
} = {};
try {
payload = JSON.parse(event.content) as typeof payload;
} catch {
/* malformed widget payload — fall back */
}
// Dispatch on rendererKind (default "mcp-app-html" for back-compat). This
// switch is the seam for declarative/runtime renderers.
const rendererKind: string = payload.rendererKind ?? "mcp-app-html";
// GenUX React runtime (#1268): payload.html is JSX *source* (not a full
// document). Render it via a bootstrap that loads the runtime bundle from the
// sandbox origin; the source + props are delivered as tool input. The runtime
// transpiles + renders the component against the Grackle component library.
// An absolute runtime.js URL is required — the inner iframe is written via
// doc.write (about:blank base), so a relative "/runtime.js" would not resolve.
if (rendererKind === "grackle-react" && payload.html) {
const sandboxOrigin: string = new URL(sandboxProxyUrl, window.location.href).origin;
const bootstrap: string =
`<!doctype html><html><head><meta charset="utf-8"></head>` +
`<body><div id="grackle-root"></div>` +
`<script type="module" src="${sandboxOrigin}/runtime.js"></script></body></html>`;
return (
<Suspense fallback={<DefaultEvent content="Loading widget..." />}>
<McpAppWidget
widgetHtml={bootstrap}
sandboxProxyUrl={sandboxProxyUrl}
csp={payload.csp}
toolInput={{
source: payload.html,
props: payload.toolInput ?? {},
components: payload.components ?? [],
}}
/>
</Suspense>
);
}
if (rendererKind !== "mcp-app-html" || !payload.html) {
return <DefaultEvent content={event.content} />;
}
return (
<Suspense fallback={<DefaultEvent content="Loading widget..." />}>
<McpAppWidget
widgetHtml={payload.html}
sandboxProxyUrl={sandboxProxyUrl}
csp={payload.csp}
toolInput={payload.toolInput}
toolResult={payload.toolResult}
/>
</Suspense>
);
}
case "system": {
// Detect system context events via the raw metadata marker
if (event.raw) {
try {
const rawData = JSON.parse(event.raw) as Record<string, unknown>;
if (rawData.systemContext === true) {
return <SystemContextEvent content={event.content} />;
}
} catch {
/* not JSON, render as normal system event */
}
}
return <SystemEvent time={time} content={event.content} />;
}
case "text":
case "output":
return <TextEvent content={event.content} onOpenDocument={onOpenDocument} />;
case "tool_use": {
let tool = "";
let args: unknown = {};
try {
const parsed = JSON.parse(event.content) as { tool?: string; args?: unknown };
tool = parsed.tool || "";
args = parsed.args;
} catch {
/* fallback to empty */
}
// When settled, pass empty result so the card shows as completed (no spinner)
// rather than in-progress. This handles Claude Code which emits results as text.
return (
<ToolCard
tool={tool}
args={args}
result={settled ? "" : undefined}
childSessionId={delegationChildId(event.sessionId, event.toolCallId, tool, args)}
onOpenDocument={onOpenDocument}
/>
);
}
case "tool_result": {
// When paired, toolUseCtx provides the tool name, args, and optional detailedResult.
// When unpaired, fall back to a generic display.
//
// Error detection (#1362): prefer the first-class `toolError` field,
// set by every runtime adapter from its native outcome signal and
// carried across the AHP wire as `result.success`. Fall back to the
// structured `content.is_ok === false` shape the reverse mapper writes
// (HR8d #1355), then to the legacy `raw.is_error` path for pre-HR8d
// JSONL replay.
let isError = event.toolError === true;
if (!isError) {
try {
const parsed = JSON.parse(event.content) as Record<string, unknown>;
Iif (parsed.is_ok === false) {
isError = true;
}
} catch {
/* content not JSON — fall through to legacy raw check */
}
}
if (!isError && event.raw) {
try {
const rawData = JSON.parse(event.raw) as Record<string, unknown>;
isError = rawData.is_error === true;
} catch {
/* ignore */
}
}
// Try to extract displayable content from JSON-wrapped results.
// Guard with startsWith check to avoid throwing on plain text content.
let resultContent = event.content;
Iif (event.content.trimStart().startsWith("{")) {
try {
const parsed = JSON.parse(event.content) as Record<string, unknown>;
Iif (typeof parsed.content === "string") {
resultContent = parsed.content;
}
} catch {
/* content looks like JSON but isn't — use as-is */
}
}
if (toolUseCtx) {
return (
<ToolCard
tool={toolUseCtx.tool}
args={toolUseCtx.args}
result={resultContent}
isError={isError}
detailedResult={toolUseCtx.detailedResult}
childSessionId={delegationChildId(
event.sessionId,
event.toolCallId,
toolUseCtx.tool,
toolUseCtx.args,
)}
onOpenDocument={onOpenDocument}
/>
);
}
// Unpaired tool_result — use generic card with fallback label
return (
<ToolCard
tool="Tool output"
args={undefined}
result={resultContent}
isError={isError}
onOpenDocument={onOpenDocument}
/>
);
}
case "error":
return <ErrorEvent content={event.content} />;
case "status":
return <StatusEvent content={event.content} />;
case "user_input":
return <UserInputEvent content={event.content} />;
case "signal":
return <SignalEvent content={event.content} />;
case "usage":
return <UsageEvent content={event.content} />;
default:
return <DefaultEvent content={event.content} />;
}
}
|