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Claude Code 2.1.232 Turns Subagent Forking On by Default

2026-08-18 ยท source:

Claude Code 2.1.232 turns on subagent forking by default and lets a user type @ in the prompt to message another named live session directly.

What it is

Claude Code 2.1.232 is a CLI release changing how subagents inherit context and how sessions communicate.

What it does

With `subagent_type: "fork"` now on by default, a forked subagent inherits the full conversation history and prompt cache instead of starting cold, and non-teammate agent spawns in interactive sessions now run in the background by default rather than blocking the foreground. Typing `@` in the prompt lets a user address another named Claude session, using `SendMessage` to reach it directly, and a bare name that exactly matches one live session delivers immediately instead of requiring a ref confirmation first. Session names on one machine are now kept unique.

Why it matters

Inheriting the prompt cache on fork avoids re-paying for context on every subagent spawn, and named cross-session messaging turns Claude Code's multi-session setup into something closer to actual inter-agent coordination instead of isolated windows.

How to use it

No config needed for default fork behavior; type `@` followed by a session name in the prompt to send it a message via `SendMessage`.

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