diff --git a/.changeset/export-inmemory-transport.md b/.changeset/export-inmemory-transport.md
new file mode 100644
index 000000000..cc1d8f730
--- /dev/null
+++ b/.changeset/export-inmemory-transport.md
@@ -0,0 +1,6 @@
+---
+'@modelcontextprotocol/server': patch
+'@modelcontextprotocol/client': patch
+---
+
+Export `InMemoryTransport` for in-process testing.
diff --git a/packages/core/src/exports/public/index.ts b/packages/core/src/exports/public/index.ts
index 2dc1e13a8..942bd2368 100644
--- a/packages/core/src/exports/public/index.ts
+++ b/packages/core/src/exports/public/index.ts
@@ -70,6 +70,7 @@ export { deserializeMessage, ReadBuffer, serializeMessage } from '../../shared/s
 // Transport types (NOT normalizeHeaders)
 export type { FetchLike, Transport, TransportSendOptions } from '../../shared/transport.js';
 export { createFetchWithInit } from '../../shared/transport.js';
+export { InMemoryTransport } from '../../util/inMemory.js';
 
 // URI Template
 export type { Variables } from '../../shared/uriTemplate.js';
diff --git a/packages/core/src/util/inMemory.ts b/packages/core/src/util/inMemory.ts
index 256363c13..4e7993209 100644
--- a/packages/core/src/util/inMemory.ts
+++ b/packages/core/src/util/inMemory.ts
@@ -9,6 +9,9 @@ interface QueuedMessage {
 
 /**
  * In-memory transport for creating clients and servers that talk to each other within the same process.
+ *
+ * Intended for testing and development. For production in-process connections, use
+ * `StreamableHTTPClientTransport` against a local server URL.
  */
 export class InMemoryTransport implements Transport {
     private _otherTransport?: InMemoryTransport;