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Sweep 25 Sep 2026 · 19:33Z Build v2.1.283 504 read Stable v2.1.274 Latest v2.1.283 Next v2.1.283 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.280 ·

Inter-agent SendMessage attribution can now include the sending plugin

Messages sent between agents can now note which plugin sent them

Under the hood Internal Changes
JSON All of v2.1.280
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
MessagingArea: what it touches
Internal ChangesKind: in v2.1.280,
Internal ChangesSection of the release
What

When one agent sends a message to another via SendMessage, the message headers can now include a from-plugin attribute naming the plugin that sent it, alongside the existing from, from-session, hop-chain, from-name, and from-mode attributes.

Why

This makes it clearer, when reviewing inter-agent messages, whether a message originated from a plugin and which one, rather than only showing the sending session or agent name.

See this entry in the whole of v2.1.280 →

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