MCP Apps
Official spec and SDK for the MCP Apps protocol. Standard for embedding UIs inside AI clients alongside MCP tools. 2,221 GitHub stars and 27 commits on main in the last 30 days.
“Official spec and SDK for the MCP Apps protocol. Standard for embedding UIs inside AI clients alongside MCP tools. 2,221 stars and 27 commits on main in the last 30 days.”
INSTALL THIS SERVER
{
"mcpServers": {
"mcp-apps": {
"command": "npx",
"args": [
"-y",
"@modelcontextprotocol/ext-apps"
]
}
}
}
{
"mcpServers": {
"mcp-apps": {
"command": "npx",
"args": [
"-y",
"@modelcontextprotocol/ext-apps"
]
}
}
}
{
"mcpServers": {
"mcp-apps": {
"command": "npx",
"args": [
"-y",
"@modelcontextprotocol/ext-apps"
]
}
}
}
{
"mcpServers": {
"mcp-apps": {
"command": "npx",
"args": [
"-y",
"@modelcontextprotocol/ext-apps"
]
}
}
}
{
"mcpServers": {
"mcp-apps": {
"command": "npx",
"args": [
"-y",
"@modelcontextprotocol/ext-apps"
]
}
}
}
5 TOOLS AVAILABLE
OUR ASSESSMENT
- Official Model Context Protocol project.
- 2,221 GitHub stars.
- 27 commits on main in the last 30 days.
- Defines the standard for UI-embedded MCP Apps.
- Reference SDK for both server and client implementers.
- Spec still evolving; expect breaking changes during beta phase.
- License NOASSERTION at inspection; track for license clarification.
- Adoption depends on MCP client support; not all clients implement the spec yet.
No authentication at the protocol layer. App-level security is the App author responsibility; review individual App manifests before installing in production agent flows.
MCP server authors who want to ship a UI alongside their tools; client developers implementing the MCP Apps spec; teams planning UI-rich agent experiences inside Claude Desktop, Cursor, or other MCP clients.
TECHNICAL DETAILS
ADOPTION METRICS
// Reading this2,221 stars on modelcontextprotocol/ext-apps. 27 commits on main in the last 30 days.
// Reading thisPairs with MCP Registry, MCP Inspector, MCPB Desktop Extensions for the official MCP protocol layer.
SOURCES & VERIFICATION
We don't take any single directory's word for it. Before scoring, we cross-reference 5 public MCP sources, install the server ourselves against the clients we cover, and record when we last re-verified.
The same server, 5 different lenses. We reconcile these signals into our editorial score, which is why our number sometimes diverges from a directory-aggregate star count.
| Source | Their rating | Their star count | Their downloads | Last synced |
|---|---|---|---|---|
| AutomationSwitch This page | 4.5editorial | 2,221 | — | MAY 9, 2026 |
| PulseMCP | — unrated | unavailable | unavailable | MAY 9, 2026 |
| MCP.so | — unrated | unavailable | unavailable | MAY 9, 2026 |
| Glama | — unrated | unavailable | unavailable | MAY 9, 2026 |
| Smithery | — unrated | unavailable | unavailable | MAY 9, 2026 |
| Official MCP Registry | — unrated | unavailable | unavailable | MAY 9, 2026 |
// Counts are directory-reported; we don't adjust them. Discrepancies usually come from different snapshot times or star-caching.
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DISCUSS YOUR
MCP REQUIREMENTS.
Evaluating a server, scoping an internal deployment, or working out whether MCP is the right fit at all. Start the conversation and we will point you at the right piece of the ecosystem.