feat: detecting transport and session id

Author: constantinius

sentry_sdk/consts.py

@@ -827,6 +827,12 @@ class SPANDATA:
     Example: "pipe" (stdio), "tcp" (HTTP/WebSocket/SSE)
     """
 
+    MCP_SESSION_ID = "mcp.session.id"
+    """
+    The session identifier for the MCP connection.
+    Example: "a1b2c3d4e5f6"
+    """
+
 
 class SPANSTATUS:
     """

sentry_sdk/integrations/mcp/__init__.py

@@ -27,9 +27,15 @@ def setup_once():
         Patches MCP server classes to instrument handler execution.
         """
         from sentry_sdk.integrations.mcp.lowlevel import patch_lowlevel_server
+        from sentry_sdk.integrations.mcp.transport import (
+            patch_streamable_http_transport,
+        )
 
         # Patch server classes to instrument handlers
         patch_lowlevel_server()
 
+        # Patch HTTP transport to track session IDs
+        patch_streamable_http_transport()
+
 
 __all__ = ["MCPIntegration"]