fix(core): export InMemoryTransport, tighten migration docs

InMemoryTransport was unreachable: the migration doc said to import it
from @modelcontextprotocol/core, but core is private (no exports field,
no dist). Adding it to core/public makes it available via the
server/client re-exports.

migration.md:
- Rewrite the InMemoryTransport section to match the new export reality
  (was: 'removed from public API, import from internal core' — neither
  half of that worked)
- Add SSE-to-StreamableHTTP before/after example
- Method-string table: add tasks/get, tasks/result,
  notifications/elicitation/complete
- Mention callToolStream() in the schema-removal section header

migration-SKILL.md:
- Fix 'core is installed automatically as a dependency' (it's internal)
- Add the same method-string rows

Author: felixweinberger

docs/migration-SKILL.md

@@ -28,7 +28,7 @@ npm uninstall @modelcontextprotocol/sdk
 | Server + Express      | `npm install @modelcontextprotocol/server @modelcontextprotocol/express` |
 | Server + Hono         | `npm install @modelcontextprotocol/server @modelcontextprotocol/hono`    |
 
-`@modelcontextprotocol/core` is installed automatically as a dependency.
+`@modelcontextprotocol/core` is an internal package — never install or import it directly. Both `@modelcontextprotocol/client` and `@modelcontextprotocol/server` re-export everything you need.
 
 ## 3. Import Mapping
 
@@ -373,6 +373,9 @@ Schema to method string mapping:
 | `PromptListChangedNotificationSchema`   | `'notifications/prompts/list_changed'`   |
 | `ProgressNotificationSchema`            | `'notifications/progress'`               |
 | `CancelledNotificationSchema`           | `'notifications/cancelled'`              |
+| `GetTaskRequestSchema`                  | `'tasks/get'`                            |
+| `GetTaskPayloadRequestSchema`           | `'tasks/result'`                         |
+| `ElicitationCompleteNotificationSchema` | `'notifications/elicitation/complete'`   |
 | `InitializedNotificationSchema`         | `'notifications/initialized'`            |
 
 Request/notification params remain fully typed. Remove unused schema imports after migration.

docs/migration.md

@@ -110,6 +110,36 @@ const transport = new NodeStreamableHTTPServerTransport({ sessionIdGenerator: ()
 
 The SSE transport has been removed from the server. Servers should migrate to Streamable HTTP. The client-side SSE transport remains available for connecting to legacy SSE servers.
 
+**Before (v1):**
+
+```typescript
+import { SSEServerTransport } from '@modelcontextprotocol/sdk/server/sse.js';
+
+let transport: SSEServerTransport;
+
+app.get('/sse', async (req, res) => {
+    transport = new SSEServerTransport('/messages', res);
+    await server.connect(transport);
+});
+app.post('/messages', async (req, res) => {
+    await transport.handlePostMessage(req, res);
+});
+```
+
+**After (v2):**
+
+```typescript
+import { NodeStreamableHTTPServerTransport } from '@modelcontextprotocol/node';
+
+app.all('/mcp', async (req, res) => {
+    const transport = new NodeStreamableHTTPServerTransport({ sessionIdGenerator: () => randomUUID() });
+    await server.connect(transport);
+    await transport.handleRequest(req, res);
+});
+```
+
+See `examples/server/src/simpleStreamableHttp.ts` for a complete working example.
+
 ### `WebSocketClientTransport` removed
 
 `WebSocketClientTransport` has been removed. WebSocket is not a spec-defined MCP transport, and keeping it in the SDK encouraged transport proliferation without a conformance baseline.
@@ -381,10 +411,13 @@ Common method string replacements:
 | `ToolListChangedNotificationSchema`     | `'notifications/tools/list_changed'`     |
 | `ResourceListChangedNotificationSchema` | `'notifications/resources/list_changed'` |
 | `PromptListChangedNotificationSchema`   | `'notifications/prompts/list_changed'`   |
+| `GetTaskRequestSchema`                  | `'tasks/get'`                            |
+| `GetTaskPayloadRequestSchema`           | `'tasks/result'`                         |
+| `ElicitationCompleteNotificationSchema` | `'notifications/elicitation/complete'`   |
 
 ### `Protocol.request()`, `ctx.mcpReq.send()`, and `Client.callTool()` no longer take a schema parameter
 
-The public `Protocol.request()`, `BaseContext.mcpReq.send()`, and `Client.callTool()` methods no longer accept a Zod result schema argument. The SDK now resolves the correct result schema internally based on the method name. This means you no longer need to import result schemas
+The public `Protocol.request()`, `BaseContext.mcpReq.send()`, `Client.callTool()`, and `client.experimental.tasks.callToolStream()` methods no longer accept a Zod result schema argument. The SDK now resolves the correct result schema internally based on the method name. This means you no longer need to import result schemas
 like `CallToolResultSchema` or `ElicitResultSchema` when making requests.
 
 **`client.request()` — Before (v1):**
@@ -459,19 +492,17 @@ const client = new Client(
 
 ### `InMemoryTransport` removed from public API
 
-`InMemoryTransport` has been removed from the public API surface. It was previously used for in-process client-server connections and testing.
-
-For **testing**, import it directly from the internal core package:
+`InMemoryTransport` is intended for testing client/server interactions within a single process. It is re-exported from both `@modelcontextprotocol/server` and `@modelcontextprotocol/client`.
 
 ```typescript
 // v1
 import { InMemoryTransport } from '@modelcontextprotocol/sdk/inMemory.js';
 
-// v2 (testing only — @modelcontextprotocol/core is internal, not for production use)
-import { InMemoryTransport } from '@modelcontextprotocol/core';
+// v2
+import { InMemoryTransport } from '@modelcontextprotocol/server';
 ```
 
-For **production in-process connections**, use `StreamableHTTPClientTransport` with a local server URL, or connect client and server via paired streams.
+For **production in-process connections**, prefer `StreamableHTTPClientTransport` with a local server URL.
 
 ### Removed type aliases and deprecated exports
 

packages/core/src/exports/public/index.ts

@@ -69,6 +69,9 @@ export { deserializeMessage, ReadBuffer, serializeMessage } from '../../shared/s
 
 // Transport types (NOT normalizeHeaders)
 export type { FetchLike, Transport, TransportSendOptions } from '../../shared/transport.js';
+
+// In-memory transport (for testing client/server in the same process)
+export { InMemoryTransport } from '../../util/inMemory.js';
 export { createFetchWithInit } from '../../shared/transport.js';
 
 // URI Template