from mcp import Client
from mcp.client import advertise
from mcp.server.apps import APP_MIME_TYPE, EXTENSION_ID, Apps, client_supports_apps
from mcp.server.mcpserver import MCPServer
from mcp.server.mcpserver.context import Context
CLOCK_HTML = """\
Clock
...
"""
apps = Apps()
@apps.tool(resource_uri="ui://clock/app.html", description="The current time.")
def get_time(ctx: Context) -> str:
now = "2026-06-26T12:00:00Z"
if not client_supports_apps(ctx):
return f"The time is {now}."
return now
apps.add_html_resource("ui://clock/app.html", CLOCK_HTML, title="Clock")
mcp = MCPServer("clock", extensions=[apps])
async def main() -> None:
async with Client(mcp, extensions=[advertise(EXTENSION_ID, {"mimeTypes": [APP_MIME_TYPE]})]) as client:
result = await client.call_tool("get_time", {})
print(result.content)
# [TextContent(text='2026-06-26T12:00:00Z')]