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The Model Context Protocol (MCP) specification defines three standard [transport mechanisms](https://spec.modelcontextprotocol.io/specification/draft/basic/transports/) for communication between clients and servers:
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1.**stdio, communication over standard in and standard out** —designed for local MCP connections.
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2.**Server-Sent Events (SSE)** —Currently supported by most remote MCP clients, but is expected to be replaced by Streamable HTTP over time. It requires two endpoints: one for sending requests, another for receiving streamed responses.
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1.**stdio, communication over standard in and standard out** —designed for local MCP connections.
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2.**Server-Sent Events (SSE)** —Currently supported by most remote MCP clients, but is expected to be replaced by Streamable HTTP over time. It requires two endpoints: one for sending requests, another for receiving streamed responses.
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3.**Streamable HTTP** — New transport method [introduced](https://modelcontextprotocol.io/specification/2025-03-26/basic/transports#streamable-http) in March 2025. It simplifies the communication by using a single HTTP endpoint for bidirectional messaging. It is currently gaining adoption among remote MCP clients, but it is expected to become the standard transport in the future.
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MCP servers built with the [Agents SDK](/agents) can support both remote transport methods (SSE and Streamable HTTP), with the [`McpAgent` class](https://github.com/cloudflare/agents/blob/2f82f51784f4e27292249747b5fbeeef94305552/packages/agents/src/mcp.ts) automatically handling the transport configuration.
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MCP servers built with the [Agents SDK](/agents) can support both remote transport methods (SSE and Streamable HTTP), with the [`McpAgent` class](https://github.com/cloudflare/agents/blob/2f82f51784f4e27292249747b5fbeeef94305552/packages/agents/src/mcp.ts) automatically handling the transport configuration.
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## Implementing remote MCP transport
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@@ -34,11 +33,11 @@ If you're manually configuring your MCP server, here's how to use the `McpAgent`
If your MCP server implements authentication & authorization using the [Workers OAuth Provider](https://github.com/cloudflare/workers-oauth-provider) Library, then you can configure it to support both transport methods using the `apiHandlers` property.
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```js
@@ -91,7 +90,7 @@ export default new OAuthProvider({
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})
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```
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### Upgrading an Existing Remote MCP Server
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### Upgrading an existing remote MCP server
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If you've already built a remote MCP server using the Cloudflare Agents SDK, make the following changes to support the new Streamable HTTP transport while maintaining compatibility with remote MCP clients using SSE:
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- Use `MyMcpAgent.serveSSE('/sse')` for the existing SSE transport. Previously, this would have been `MyMcpAgent.mount('/sse')`, which has been kept as an alias.
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- Add a new path with `MyMcpAgent.serve('/mcp')` to support the new Streamable HTTP transport.
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With these few changes, your MCP server will support both transport methods, making it compatible with both existing and new clients.
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### Testing with MCP Clients
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### Testing with MCP clients
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While most MCP clients have not yet adopted the new Streamable HTTP transport, you can start testing it today using [`mcp-remote`](https://www.npmjs.com/package/mcp-remote), an adapter that lets MCP clients that otherwise only support local connections work with remote MCP servers.
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Follow [this guide](/agents/guides/test-remote-mcp-server/) for instructions on how to connect to your remote MCP server from Claude Desktop, Cursor, Windsurf, and other local MCP clients, using the [`mcp-remote` local proxy](https://www.npmjs.com/package/mcp-remote).
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