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Sweep 28 Aug 2026 ยท 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

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.

One change

Message your other Claude Code sessions

cross-session-messaging

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Nearest release: v2.1.235, published 5 hours before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

cross-session-messaging Changed · +2 / -1 lines

from line 59
 
 The receiving Claude reads the message between tool calls during an active turn, so a running tool is never interrupted. When the receiving session is idle, Claude Code starts a new turn with the message.
 
-Between two ordinary interactive sessions with default settings, Claude Code delivers the message. Delivery isn't guaranteed in every configuration, though. The receiving session checks each arriving message against its own [inbound controls](#control-inbound-messages), and the check ends in one of three outcomes:
+Between two ordinary interactive sessions with default settings, Claude Code delivers the message. Delivery isn't guaranteed in every configuration, though. Claude Code refuses a message [over the size cap](#limitations) in the sending session, before it leaves. The receiving session checks each arriving message against its own [inbound controls](#control-inbound-messages), and the check ends in one of three outcomes:
 
 * **Delivered**: Claude Code passes the message to the receiving Claude.
 * **Held**: Claude Code sets the message aside undelivered. A held message reaches Claude only when you approve it or a later mode or settings change allows it.
from line 261
 The limits here are properties of the messaging channel itself and apply wherever the feature runs. For platform and provider gaps, see [Availability](#availability) instead.
 
 * **Plain text only**: Claude sends only plain text across sessions. Structured [agent team](/docs/en/agent-teams) protocol messages stay within a team.
+* **Same-machine message size is capped**: Claude Code refuses a message to a session on this machine once its serialized form passes about a million characters. The refusal [names the exact sizes](/docs/en/errors#message-too-large-for-cross-session-delivery). Nothing reaches the receiving session.
 * **Message loops are throttled**: Claude Code rate-limits repeated messages per sender, drops identical repeats arriving within a short window, and caps accepted messages waiting for Claude to read them at 50 per session. A message loop between two sessions therefore stops on its own.
 
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