Open a PyGen MCP event stream

GET https://{controlplane_path}/api/1/rest/public/platform_mcp/mcp/pygen

Overview

This API opens a persistent Server-Sent Events (SSE) stream for receiving server-initiated messages from the Platform MCP Server on the PyGen toolset.

Use this endpoint when your MCP client needs to receive asynchronous notifications or streaming responses initiated by the server for the PyGen toolset. The stream remains open until the client closes the connection or the session is terminated with DELETE /platform_mcp/mcp/pygen.

Prerequisites

Read access to the requested assets
An active PyGen toolset MCP session. Initialize a session with POST /platform_mcp/mcp/pygen and obtain the Mcp-Session-Id before opening a stream.

Request

GET https://{controlplane_path}/api/1/rest/public/platform_mcp/mcp/pygen

Path parameters


Key	Description
`controlplane_path`	Required. The path to the SnapLogic control plane: `elastic.snaplogic.com` For the UAT or EMEA control plane, substitute the name for `elastic`. For example: `uat.elastic.snaplogic.com` `emea.snaplogic.com`

Request headers


Key	Type	Description
`Authorization`	String	Required. SLToken or HTTP Basic credentials.
`Mcp-Session-Id`	String	Required. The session identifier returned by the `initialize` response. Associates this SSE stream with an existing PyGen toolset MCP session.

Request body

None.

Response

Returns a chunked SSE stream with Content-Type: text/event-stream. Each event carries a JSON-RPC 2.0 message in the data field:

event: message
data: {"jsonrpc": "2.0", "method": "notifications/message", "params": { ... }}

HTTP status codes:


Key	Description
`200 OK`	The SSE stream is open and ready to receive server-initiated messages.
`401 Unauthorized`	The request is missing a valid `Authorization` header.
`502 Bad Gateway`	The Platform MCP Server is unreachable.

Examples

GET https://cdn.elastic.snaplogic.com/api/1/rest/public/platform_mcp/mcp/pygen
Authorization: SLToken <your_token>
Mcp-Session-Id: <session_id>