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feat(compat): export InMemoryTransport from public API surface (#1834)

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Co-authored-by: Konstantin Konstantinov <KKonstantinov@users.noreply.github.com>
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Felix Weinberger 2026-04-27 13:24:05 +01:00 • committed by GitHub
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6
.changeset/export-inmemory-transport.md Normal file
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@ -0,0 +1,6 @@
---
'@modelcontextprotocol/server': patch
'@modelcontextprotocol/client': patch
---
Export `InMemoryTransport` for in-process testing.

14
docs/migration.md
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@ -469,22 +469,20 @@ const client = new Client(
);
```
### `InMemoryTransport` removed from public API
### `InMemoryTransport` moved
`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 now exported from `@modelcontextprotocol/client` and `@modelcontextprotocol/server` (both re-export it). It is still intended for in-process client-server connections and testing.
```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';
// or
import { InMemoryTransport } from '@modelcontextprotocol/client';
```
For **production in-process connections**, use `StreamableHTTPClientTransport` with a local server URL, or connect client and server via paired streams.
### Removed type aliases and deprecated exports
The following deprecated type aliases have been removed from `@modelcontextprotocol/core`:

1
packages/core/src/exports/public/index.ts
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@ -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';

3
packages/core/src/util/inMemory.ts
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@ -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;