You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
AgentsArea: what it touches
New FeaturesKind: in v2.1.251,
New FeaturesSection of the release
What
Resuming an agent whose transcript is missing now explains that the id likely came from a different Claude Code process, such as a lead's subagent seen from a teammate pane, and tells you to reply through the naming session rather than pasting the raw id.
Details
Only shown when the transcript is genuinely missing and the agent's name resolves to a known session; otherwise the previous generic failure is used.
Evidence
it never ran in this session — reply through "${ki}" or the session that sent it instead of the raw id
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
