File size: 5,355 Bytes
e1cc3bc | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 | /**
* @file App that demonstrates a few features using MCP Apps SDK + React.
*/
import type { App, McpUiHostContext } from "@modelcontextprotocol/ext-apps";
import { useApp } from "@modelcontextprotocol/ext-apps/react";
import type { CallToolResult } from "@modelcontextprotocol/sdk/types.js";
import { StrictMode, useCallback, useEffect, useState } from "react";
import { createRoot } from "react-dom/client";
import styles from "./mcp-app.module.css";
function extractTime(callToolResult: CallToolResult): string {
const { text } = callToolResult.content?.find((c) => c.type === "text")!;
return text;
}
function GetTimeApp() {
const [toolResult, setToolResult] = useState<CallToolResult | null>(null);
const [hostContext, setHostContext] = useState<McpUiHostContext | undefined>();
// `useApp` (1) creates an `App` instance, (2) calls `onAppCreated` to
// register handlers, and (3) calls `connect()` on the `App` instance.
const { app, error } = useApp({
appInfo: { name: "Get Time App", version: "1.0.0" },
capabilities: {},
onAppCreated: (app) => {
app.onteardown = async () => {
console.info("App is being torn down");
return {};
};
app.ontoolinput = async (input) => {
console.info("Received tool call input:", input);
};
app.ontoolresult = async (result) => {
console.info("Received tool call result:", result);
setToolResult(result);
};
app.ontoolcancelled = (params) => {
console.info("Tool call cancelled:", params.reason);
};
app.onerror = console.error;
app.onhostcontextchanged = (params) => {
setHostContext((prev) => ({ ...prev, ...params }));
};
},
});
useEffect(() => {
if (app) {
setHostContext(app.getHostContext());
}
}, [app]);
if (error) return <div><strong>ERROR:</strong> {error.message}</div>;
if (!app) return <div>Connecting...</div>;
return <GetTimeAppInner app={app} toolResult={toolResult} hostContext={hostContext} />;
}
interface GetTimeAppInnerProps {
app: App;
toolResult: CallToolResult | null;
hostContext?: McpUiHostContext;
}
function GetTimeAppInner({ app, toolResult, hostContext }: GetTimeAppInnerProps) {
const [serverTime, setServerTime] = useState("Loading...");
const [messageText, setMessageText] = useState("This is message text.");
const [logText, setLogText] = useState("This is log text.");
const [linkUrl, setLinkUrl] = useState("https://modelcontextprotocol.io/");
useEffect(() => {
if (toolResult) {
setServerTime(extractTime(toolResult));
}
}, [toolResult]);
const handleGetTime = useCallback(async () => {
try {
console.info("Calling get-time tool...");
const result = await app.callServerTool({ name: "get-time", arguments: {} });
console.info("get-time result:", result);
setServerTime(extractTime(result));
} catch (e) {
console.error(e);
setServerTime("[ERROR]");
}
}, [app]);
const handleSendMessage = useCallback(async () => {
const signal = AbortSignal.timeout(5000);
try {
console.info("Sending message text to Host:", messageText);
const { isError } = await app.sendMessage(
{ role: "user", content: [{ type: "text", text: messageText }] },
{ signal },
);
console.info("Message", isError ? "rejected" : "accepted");
} catch (e) {
console.error("Message send error:", signal.aborted ? "timed out" : e);
}
}, [app, messageText]);
const handleSendLog = useCallback(async () => {
console.info("Sending log text to Host:", logText);
await app.sendLog({ level: "info", data: logText });
}, [app, logText]);
const handleOpenLink = useCallback(async () => {
console.info("Sending open link request to Host:", linkUrl);
const { isError } = await app.openLink({ url: linkUrl });
console.info("Open link request", isError ? "rejected" : "accepted");
}, [app, linkUrl]);
return (
<main
className={styles.main}
style={{
paddingTop: hostContext?.safeAreaInsets?.top,
paddingRight: hostContext?.safeAreaInsets?.right,
paddingBottom: hostContext?.safeAreaInsets?.bottom,
paddingLeft: hostContext?.safeAreaInsets?.left,
}}
>
<p className={styles.notice}>Watch activity in the DevTools console!</p>
<div className={styles.action}>
<p>
<strong>Server Time:</strong> <code id="server-time">{serverTime}</code>
</p>
<button onClick={handleGetTime}>Get Server Time</button>
</div>
<div className={styles.action}>
<textarea value={messageText} onChange={(e) => setMessageText(e.target.value)} />
<button onClick={handleSendMessage}>Send Message</button>
</div>
<div className={styles.action}>
<input type="text" value={logText} onChange={(e) => setLogText(e.target.value)} />
<button onClick={handleSendLog}>Send Log</button>
</div>
<div className={styles.action}>
<input type="url" value={linkUrl} onChange={(e) => setLinkUrl(e.target.value)} />
<button onClick={handleOpenLink}>Open Link</button>
</div>
</main>
);
}
createRoot(document.getElementById("root")!).render(
<StrictMode>
<GetTimeApp />
</StrictMode>,
);
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