session.send

A Claude Code settings key, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.

Releases whose published page names session.send.

1. v2.1.280 22 Sep 2026
   New plugin-hookable event: session.send

   Plugin hooks can now listen for a new session.send event, alongside session.receive/detach/end

   named in this entry, found in this entry's text

2. v2.1.280 22 Sep 2026
   Plugin hooks can intercept and readdress SendMessage sends

   Plugin hooks can now intercept SendMessage calls, rewriting or blocking who a message goes to

   found in this entry's text

3. v2.1.280 22 Sep 2026
   Plugin/SDK host API: new $.session.send operation

   Plugins and SDK integrations gain a session.send call to message a target by name, agent id, or session/agent address

   found in this entry's text

4. v2.1.280 22 Sep 2026
   Plugin $.session.messages and $.session.usage now accept an agentId/as parameter

   Plugin session.messages and session.send can now target a specific agent via an agentId/as parameter

   found in this entry's text

The earliest release whose published evidence quoted session.send was v2.1.280, 22 Sep 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.

1 further span in the ledger name it. The list above is the earliest first and stops at 6.

The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.

Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the settings key does. All settings keys.