Source Intelligence
Reading a new release v2.1.251 Analysing changes · 2/5 Deeper second pass · 4/5 agents 427 findings $12.75 so far

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

All of v2.1.16 Home All releases olderv2.1.15 v2.1.17newer
Claude Code v2.1.16

Mailbox-Based Inter-Agent Communication

What

Filesystem-based mailbox system for asynchronous communication between team members.

Details
  • Each agent has an inbox at ~/.claude/teams/{team-name}/inboxes/{agent-name}.json
  • Messages include timestamp, sender, and content
  • Automatic delivery of messages when agent turn ends
  • Queued messages for busy agents delivered after their turn completes
  • Supports permission requests/responses, shutdown requests, plan approvals
Evidence

TeammateMailbox functions writeToMailbox, readMailbox, markMessagesAsRead with logging "[TeammateMailbox] Wrote message to", "[TeammateMailbox] readMailbox"

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.16 →