feat(mcp-capabilities): add MCP Capabilities plugins

.github/CODEOWNERS

@@ -85,6 +85,8 @@ yarn.lock                                                               @backsta
 /workspaces/linguist                                                    @backstage/community-plugins-maintainers  @awanlin
 /workspaces/linkerd                                                     @backstage/community-plugins-maintainers
 /workspaces/manage                                                      @backstage/community-plugins-maintainers  @grantila
+/workspaces/mcp-capabilities
+@backstage/community-plugins-maintainers @jh_sh @0rc
 /workspaces/mcp-chat                                                    @backstage/community-plugins-maintainers  @Lucifergene @christoph-jerolimov @Eswaraiahsapram
 /workspaces/mend                                                        @backstage/community-plugins-maintainers  @NormanWenzelWSS @rupalvihol @hetsaliya-crestdata
 /workspaces/microsoft-calendar                                          @backstage/community-plugins-maintainers

workspaces/mcp-capabilities/.changeset/README.md

@@ -0,0 +1,8 @@
+# Changesets
+
+Hello and welcome! This folder has been automatically generated by `@changesets/cli`, a build tool that works
+with multi-package repos, or single-package repos to help you version and publish your code. You can
+find the full documentation for it [in our repository](https://github.com/changesets/changesets)
+
+We have a quick list of common questions to get you started engaging with this project in
+[our documentation](https://github.com/changesets/changesets/blob/main/docs/common-questions.md)

workspaces/mcp-capabilities/.changeset/add-mcp-capabilities.md

@@ -0,0 +1,11 @@
+---
+'@backstage-community/plugin-mcp-capabilities': minor
+'@backstage-community/plugin-mcp-capabilities-backend': minor
+'@backstage-community/plugin-mcp-capabilities-common': minor
+---
+
+Introduce the MCP Capabilities plugins for native `API` / `spec.type: mcp-server` catalog entities.
+
+- **Backend**: connects to each MCP server (streamable-http) to discover its tools, resources, and prompts. A catalog processor enriches the entity with a summary (capabilities, counts, and tool names for search), and an on-demand endpoint serves the full live detail.
+- **Frontend** (new frontend system, Backstage UI): an overview card with the server's identity and capabilities, and a "Capabilities" tab listing tools, resources, and prompts.
+- **Common**: shared types and a catalog model layer that additively extends the native `mcp-server` schema (existing entities remain valid).

workspaces/mcp-capabilities/.changeset/config.json

@@ -0,0 +1,14 @@
+{
+  "$schema": "https://unpkg.com/@changesets/config@3.0.0/schema.json",
+  "changelog": "@changesets/cli/changelog",
+  "commit": false,
+  "fixed": [],
+  "linked": [],
+  "access": "public",
+  "baseBranch": "main",
+  "updateInternalDependencies": "patch",
+  "privatePackages": {
+    "tag": false,
+    "version": false
+  }
+}

workspaces/mcp-capabilities/.dockerignore

@@ -0,0 +1,8 @@
+.git
+.yarn/cache
+.yarn/install-state.gz
+node_modules
+packages/*/src
+packages/*/node_modules
+plugins
+*.local.yaml

workspaces/mcp-capabilities/.eslintignore

@@ -0,0 +1 @@
+playwright.config.ts

workspaces/mcp-capabilities/.eslintrc.js

@@ -0,0 +1 @@
+module.exports = require('../../.eslintrc.cjs');

workspaces/mcp-capabilities/.gitignore

@@ -0,0 +1,54 @@
+# macOS
+.DS_Store
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Coverage directory generated when running tests with coverage
+coverage
+
+# Dependencies
+node_modules/
+
+# Yarn 3 files
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions
+
+# Node version directives
+.nvmrc
+
+# dotenv environment variables file
+.env
+.env.test
+
+# Build output
+dist
+dist-types
+
+# Temporary change files created by Vim
+*.swp
+
+# MkDocs build output
+site
+
+# Local configuration files
+*.local.yaml
+
+# Sensitive credentials
+*-credentials.yaml
+
+# vscode database functionality support files
+*.session.sql
+
+# E2E test reports
+e2e-test-report/

workspaces/mcp-capabilities/.prettierignore

@@ -0,0 +1,5 @@
+dist
+dist-types
+coverage
+.vscode
+.eslintrc.js

workspaces/mcp-capabilities/.yarnrc.yml

@@ -0,0 +1,4 @@
+approvedGitRepositories:
+  - '**'
+
+enableScripts: true

workspaces/mcp-capabilities/README.md

@@ -0,0 +1,45 @@
+# MCP Capabilities for Backstage
+
+Plugins that enrich native MCP server catalog entities (`kind: API`,
+`spec.type: mcp-server`) with their live **capabilities** — the tools,
+resources, and prompts each server exposes.
+
+## Plugins
+
+- [mcp-capabilities](./plugins/mcp-capabilities/README.md) — frontend (new
+  frontend system, [Backstage UI](https://backstage.io/docs/getting-started/ui)):
+  an overview card and a **Capabilities** tab on the entity page.
+- [mcp-capabilities-backend](./plugins/mcp-capabilities-backend/README.md) —
+  backend: connects to each MCP server, enriches its catalog entity, and serves
+  live tool/resource/prompt detail.
+- [mcp-capabilities-common](./plugins/mcp-capabilities-common/README.md) — shared
+  types and the schema-extension catalog model layer.
+
+## How it works
+
+Each `mcp-server` API entity declares its endpoint in `spec.remotes`. The backend
+connects over the MCP streamable-http transport to discover what the server
+exposes:
+
+- a catalog **processor** writes a summary (capabilities, counts, and tool names
+  for search) onto the entity — powering the overview card and catalog search;
+- an on-demand endpoint, `GET /api/mcp-capabilities/spec?entityRef=…`, returns the
+  full live tool/resource/prompt detail — powering the Capabilities tab.
+
+The common package's catalog model layer **extends** the native `mcp-server`
+schema additively (via `updateKind`), so entities that haven't been enriched yet
+remain valid.
+
+> **Frontend system:** these plugins target the **new** Backstage frontend
+> system. Legacy-frontend-system support is a planned follow-up.
+
+## Local development
+
+```sh
+yarn install
+yarn start
+```
+
+## Credits
+
+Made at [EPAM](https://www.epam.com), with love for the community. ❤️

workspaces/mcp-capabilities/backstage.json

@@ -0,0 +1 @@
+{ "version": "1.52.0" }

workspaces/mcp-capabilities/bcp.json

@@ -0,0 +1,4 @@
+{
+  "autoVersionBump": false,
+  "knipReports": false
+}

workspaces/mcp-capabilities/package.json

@@ -0,0 +1,61 @@
+{
+  "name": "@internal/mcp-capabilities",
+  "version": "1.0.0",
+  "private": true,
+  "engines": {
+    "node": "22 || 24"
+  },
+  "scripts": {
+    "start": "backstage-cli repo start",
+    "tsc": "tsc",
+    "tsc:full": "tsc --skipLibCheck false --incremental false",
+    "build:all": "backstage-cli repo build --all",
+    "build:api-reports": "yarn build:api-reports:only --tsc",
+    "build:api-reports:only": "backstage-repo-tools api-reports -o ae-wrong-input-file-type,ae-undocumented --validate-release-tags",
+    "build:knip-reports": "backstage-repo-tools knip-reports",
+    "clean": "backstage-cli repo clean",
+    "test": "backstage-cli repo test",
+    "test:all": "backstage-cli repo test --coverage",
+    "fix": "backstage-cli repo fix",
+    "lint": "backstage-cli repo lint --since origin/main",
+    "lint:all": "backstage-cli repo lint",
+    "prettier:check": "prettier --check .",
+    "prettier:fix": "prettier --write .",
+    "new": "backstage-cli new --scope @backstage-community",
+    "postinstall": "cd ../../ && yarn install"
+  },
+  "workspaces": [
+    "packages/*",
+    "plugins/*"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/backstage/community-plugins",
+    "directory": "workspaces/mcp-capabilities"
+  },
+  "devDependencies": {
+    "@backstage/cli": "^0.36.3",
+    "@backstage/cli-defaults": "^0.1.3",
+    "@backstage/e2e-test-utils": "^0.1.2",
+    "@backstage/repo-tools": "^0.17.3",
+    "@changesets/cli": "^2.27.1",
+    "knip": "^5.27.4",
+    "node-gyp": "^10.0.0",
+    "prettier": "^2.3.2",
+    "typescript": "~5.8.0"
+  },
+  "resolutions": {
+    "@types/react": "^18",
+    "@types/react-dom": "^18"
+  },
+  "prettier": "@backstage/cli/config/prettier",
+  "lint-staged": {
+    "*.{js,jsx,ts,tsx,mjs,cjs}": [
+      "eslint --fix",
+      "prettier --write"
+    ],
+    "*.{json,md}": [
+      "prettier --write"
+    ]
+  }
+}

workspaces/mcp-capabilities/plugins/README.md

@@ -0,0 +1,9 @@
+# The Plugins Folder
+
+This is where your own plugins and their associated modules live, each in a
+separate folder of its own.
+
+If you want to create a new plugin here, go to your project root directory, run
+the command `yarn new`, and follow the on-screen instructions.
+
+You can also check out existing plugins on [the plugin marketplace](https://backstage.io/plugins)!

workspaces/mcp-capabilities/plugins/mcp-capabilities-backend/.eslintrc.js

@@ -0,0 +1 @@
+module.exports = require('@backstage/cli/config/eslint-factory')(__dirname);

workspaces/mcp-capabilities/plugins/mcp-capabilities-backend/README.md

@@ -0,0 +1,103 @@
+# @backstage-community/plugin-mcp-capabilities-backend
+
+Backend for the MCP Capabilities suite. It connects to the MCP servers described
+by native `API` / `spec.type: mcp-server` catalog entities (reading their
+`spec.remotes[].url`) and exposes what they offer.
+
+Two parts, both reading `spec.remotes` off the catalog entity (no duplicate
+config):
+
+1. **Catalog module** (`catalogModuleMcpCapabilities`) — a processor that writes a
+   discovered summary (capabilities, counts, `serverInfo`, and a flat list of tool
+   names for catalog search) onto each `mcp-server` entity. Failures are skipped
+   gracefully, so an unreachable server never fails catalog ingestion.
+2. **Backend plugin** — an on-demand router,
+   `GET /api/mcp-capabilities/spec?entityRef=<ref>`, returning the full live
+   tool / resource / prompt detail for the Capabilities tab.
+
+The MCP client speaks the streamable-http transport with the JSON-RPC handshake
+(`initialize` → `notifications/initialized` → capability-gated
+`tools/list` / `resources/list` / `prompts/list`), is SSE-aware, and handles the
+`Mcp-Session-Id` header.
+
+## Installation
+
+```sh
+yarn --cwd packages/backend add @backstage-community/plugin-mcp-capabilities-backend
+```
+
+```ts
+// packages/backend/src/index.ts
+import { provideStaticCatalogModel } from '@backstage/plugin-catalog-node/alpha';
+import { mcpServerApiEntityModel } from '@backstage/catalog-model/alpha';
+import { mcpServerEnrichmentModelLayer } from '@backstage-community/plugin-mcp-capabilities-common';
+import { catalogModuleMcpCapabilities } from '@backstage-community/plugin-mcp-capabilities-backend';
+
+const backend = createBackend();
+
+// Native mcp-server kind + the additive enrichment model layer
+backend.add(
+  provideStaticCatalogModel({
+    layers: [mcpServerApiEntityModel, mcpServerEnrichmentModelLayer],
+  }),
+);
+
+// Discovery: enrichment processor + on-demand /spec router
+backend.add(import('@backstage-community/plugin-mcp-capabilities-backend'));
+backend.add(catalogModuleMcpCapabilities);
+
+backend.start();
+```
+
+Register some native `mcp-server` entities, e.g.:
+
+```yaml
+apiVersion: backstage.io/v1alpha1
+kind: API
+metadata:
+  name: aws-docs
+spec:
+  type: mcp-server
+  lifecycle: production
+  owner: group:default/guests
+  remotes:
+    - type: streamable-http
+      url: https://your-mcp-server.example.com/mcp
+```
+
+Verify:
+
+```sh
+curl 'http://localhost:7007/api/mcp-capabilities/spec?entityRef=api:default/aws-docs'
+```
+
+## Limitations
+
+- **Network reachability (backend egress).** Discovery runs from the Backstage
+  **backend** — the catalog processor and the `/spec` route — which connect
+  _outbound_ to each server's `spec.remotes[].url` over the MCP streamable-http
+  transport. Your backend must therefore be able to reach every MCP server you
+  register. Servers on a private network, behind a VPN, or firewalled need the
+  backend to have a route to them (VPC/peering, allow-listed egress, or an HTTP
+  proxy). The browser never connects to the MCP server directly, so this is a
+  backend-egress concern, not a CORS one.
+- **Unreachable or slow servers.** Discovery is time-boxed (15s in the catalog
+  processor, 30s for the on-demand `/spec` route). A server that is unreachable or
+  times out is skipped gracefully: the processor leaves the entity unchanged, and
+  `/spec` returns an error that the Capabilities tab surfaces.
+- **Per-request auth.** Remotes requiring signed requests (e.g. AWS Bedrock
+  AgentCore Gateway, SigV4) are not yet signed — those remotes are skipped by the
+  processor and error from `/spec`. Per-remote auth is a possible enhancement (depends on how future backstage shift to `connections` plays out).
+
+## Development
+
+`yarn start` in this directory runs the plugin standalone (see [`/dev`](./dev)).
+
+## Exports
+
+- default — the backend plugin (mounts the `/spec` router)
+- `catalogModuleMcpCapabilities` — the enrichment catalog module
+
+## Credits
+
+Made at [EPAM](https://www.epam.com), with love for the community. ❤️