Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
TelemetryArea: what it touches
Internal ChangesKind: in v2.1.248,
Internal ChangesSection of the release
What
The event serialiser gained fields for the MCP server name and MCP tool name, plus a client-reported authentication block holding account and organization identifiers, alongside the existing session, skill, plugin and marketplace fields. These are sent whenever the calling code fills them in.
Evidence
mcp_server_name
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
