Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
SDKArea: what it touches
Internal ChangesKind: in v2.1.280,
Internal ChangesSection of the release
Unclear The finding does not say what consumes these new callbacks or what user-facing behavior they enable.
What
The internal bridge object that Claude Code's SDK and plugins use to talk to a running session (the same object that already exposed things like canUseTool and toast) now also exposes two new functions: savedAgentMessages and requestMessages. They are wired up to the session's stored data and its computed list of tools.
Why
This is internal plumbing rather than something most users will interact with directly. It gives SDK integrations and plugins a way to read back saved agent messages and request messages for a session, which they could not do through this bridge before.
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
Confirmed sinceAnthropic's documentation has since written up requestMessages, on fallback-credit.List<BetaMessageParam> requestMessages = [new BetaUserMessageParam { Content = "Hello, Claude" }];build-with-claude/fallback-creditsee the edit
How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtThe finding does not say what consumes these new callbacks or what user-facing behavior they enable.
Anthropic's documentation agreesAnthropic's documentation has since written up requestMessages, on fallback-credit.
Anthropic's release notes agreeAdded mouse support to more lists in fullscreen mode: the wheel scrolls the /skills list, and a skill's state options in /plugin can be…
