# modelcontextprotocol/ext-apps

Official repo for spec & SDK of MCP Apps protocol - standard for UIs embedded AI chatbots, served by MCP servers

Repository: https://github.com/modelcontextprotocol/ext-apps
Canonical: https://ross.abutalabs.com/products/ext-apps
Homepage: https://apps.extensions.modelcontextprotocol.io/
Language: TypeScript
License: NOASSERTION
License Family: other
Topics: ai, apps, mcp, mcp-apps, modelcontextprotocol, ui
Last push: 2026-08-12T15:04:55+00:00

## Health v2 (maintenance only)
Score: 81/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 97, release rhythm 94, longevity 20
- inputs: {"age_days": 285, "days_push": 21, "days_rel": 41, "gap_med": 2.5, "n_releases_24m": 35}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2766, forks 370 (observed 2026-08-28T04:07:18.621568+00:00)

## What it is
Official specification and TypeScript SDK for the MCP Apps protocol, a standard for building interactive UIs (charts, forms, dashboards) that render inline in AI chat clients like Claude and ChatGPT. It also ships Agent Skills for scaffolding and migrating MCP Apps.

## Use cases
- build interactive UIs for MCP tools
- embed charts and dashboards in AI chatbots
- add UI to an existing MCP server's tools
- convert an OpenAI App to MCP Apps
- turn a web app into a hybrid web + MCP App

## When to choose
- you serve MCP tools and want rich interactive UIs rendered inline in chat clients
- you want to follow the official MCP Apps specification
- you need SDK support plus scaffolding skills for building MCP Apps

## When to avoid
- you only need text or structured data responses from MCP tools
- your target chat client does not support the MCP Apps extension
- you need a standalone web app framework unrelated to MCP

## Facets
- artifact type: library
- maturity: active
- function: mcp, ui-components, sdk, frontend-framework
- domain: large-language-models, web-development, frontend
- platform: browser
- tags: mcp-apps, model-context-protocol, embedded-ui, chat-clients, specification, agent-skills, ai-agents, typescript, nodejs, web-server

## Member repositories
- modelcontextprotocol/ext-apps (main) score 81

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:18.621568+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T08:31:46.158550+00:00, confidence not recorded.
  - readme: https://github.com/modelcontextprotocol/ext-apps (fetched 2026-08-28T04:07:18.621568+00:00, sha 367d8d1e1f79)
  - homepage: https://apps.extensions.modelcontextprotocol.io/ (fetched 2026-08-29T09:56:29.651227+00:00, sha 377bee76e68a)
  - site_page: https://apps.extensions.modelcontextprotocol.io/api (fetched 2026-08-29T09:56:29.660021+00:00, sha 49fb0e1b5cdc)
- Data as of 2026-08-30T08:39:29.467469+00:00.