Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
SessionsArea: what it touches
Internal ChangesKind: in v2.1.247,
Internal ChangesSection of the release
What
The session writer now tracks which subagent transcripts to skip fetching and counts the fetches it does make, and resume telemetry reports how much subagent history was read and which hydration mode was used. Whether the deferred path runs is decided by session state rather than a flag in this code.
Details
New internals: internalAgentEventReader, subagentLazyHydrate, agentIdsNotToFetch, agentTranscriptFetches.
Telemetry gained subagent_read and a subagent_hydrate mode; the old boolean is now derived from that mode being skipped_delta.
Evidence
subagentLazyHydrate
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
