refactor: move the schema source modules into @modelcontextprotocol/core (#2477)

packages/server/package.json

@@ -133,6 +133,7 @@
         "test:watch": "vitest"
     },
     "dependencies": {
+        "@modelcontextprotocol/core": "workspace:*",
         "zod": "catalog:runtimeShared"
     },
     "devDependencies": {

packages/server/tsconfig.json

@@ -6,6 +6,7 @@
         "paths": {
             "*": ["./*"],
             "@modelcontextprotocol/core-internal": ["./node_modules/@modelcontextprotocol/core-internal/src/index.ts"],
+            "@modelcontextprotocol/core/internal": ["./node_modules/@modelcontextprotocol/core/src/internal.ts"],
             "@modelcontextprotocol/core-internal/public": [
                 "./node_modules/@modelcontextprotocol/core-internal/src/exports/public/index.ts"
             ],

packages/server/tsdown.config.ts

@@ -33,5 +33,8 @@ export default defineConfig({
         }
     },
     noExternal: ['@modelcontextprotocol/core-internal', 'ajv', 'ajv-formats', '@cfworker/json-schema'],
-    external: ['@modelcontextprotocol/server/_shims']
+    // The schema modules live in @modelcontextprotocol/core (a real runtime dependency); the
+    // bundled core-internal shims import them via the './internal' subpath, which must stay an
+    // external import (explicit entry — the tsconfig paths alias would otherwise inline it).
+    external: ['@modelcontextprotocol/server/_shims', '@modelcontextprotocol/core/internal']
 });