Add TypeScript SDK scaffolding with CI and linting

.github/workflows/ci.yml

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+on:
+    push:
+        branches:
+            - main
+    pull_request:
+
+concurrency:
+    group: ${{ github.workflow }}-${{ github.ref }}
+    cancel-in-progress: true
+
+jobs:
+    build:
+        runs-on: ubuntu-latest
+        defaults:
+            run:
+                working-directory: sdk/typescript
+
+        steps:
+            - uses: actions/checkout@v4
+            - uses: actions/setup-node@v4
+              with:
+                  node-version: 18
+                  cache: npm
+                  cache-dependency-path: sdk/typescript/package-lock.json
+
+            - run: npm ci
+            - run: npm run build
+            - run: npm test
+            - run: npm run lint

sdk/typescript/.prettierignore

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+dist
+coverage
+node_modules
+*-lock.*

sdk/typescript/.prettierrc.json

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+{
+    "printWidth": 140,
+    "tabWidth": 4,
+    "useTabs": false,
+    "semi": true,
+    "singleQuote": true,
+    "trailingComma": "none",
+    "bracketSpacing": true,
+    "bracketSameLine": false,
+    "proseWrap": "always",
+    "arrowParens": "avoid",
+    "overrides": [
+        {
+            "files": "**/*.md",
+            "options": {
+                "printWidth": 280
+            }
+        }
+    ]
+}

sdk/typescript/eslint.config.mjs

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+// @ts-check
+
+import eslint from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import eslintConfigPrettier from 'eslint-config-prettier/flat';
+
+export default tseslint.config(
+    eslint.configs.recommended,
+    ...tseslint.configs.recommended,
+    {
+        linterOptions: {
+            reportUnusedDisableDirectives: false
+        },
+        rules: {
+            '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_' }]
+        }
+    },
+    eslintConfigPrettier
+);

sdk/typescript/package.json

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+{
+    "name": "@anthropic/ext-grouping",
+    "version": "0.1.0",
+    "description": "MCP Grouping Extension — organize tools, prompts, and resources into named groups",
+    "type": "module",
+    "main": "dist/index.js",
+    "types": "dist/index.d.ts",
+    "files": [
+        "dist"
+    ],
+    "scripts": {
+        "build": "tsc",
+        "test": "vitest run",
+        "test:watch": "vitest",
+        "lint": "eslint src/ && prettier --check .",
+        "format": "prettier --write ."
+    },
+    "dependencies": {
+        "@modelcontextprotocol/sdk": "^1.27.0",
+        "zod": "^3.24.0"
+    },
+    "devDependencies": {
+        "@eslint/js": "^9.0.0",
+        "@types/node": "^25.3.0",
+        "eslint": "^9.0.0",
+        "eslint-config-prettier": "^10.0.0",
+        "prettier": "^3.0.0",
+        "tsx": "^4.19.0",
+        "typescript": "^5.7.0",
+        "typescript-eslint": "^8.0.0",
+        "vitest": "^3.0.0"
+    },
+    "license": "MIT"
+}

sdk/typescript/tsconfig.json

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+{
+    "compilerOptions": {
+        "target": "ES2022",
+        "module": "Node16",
+        "moduleResolution": "Node16",
+        "declaration": true,
+        "outDir": "dist",
+        "rootDir": "src",
+        "strict": true,
+        "esModuleInterop": true,
+        "skipLibCheck": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "include": ["src"],
+    "exclude": ["node_modules", "dist", "test", "examples"]
+}