Claude Code Just Got 3 Backup Brains

Claude Code quietly became almost unkillable. The new fallbackModel setting lets you line up to three backup models that take over the second your primary is overloaded — so an overnight agent run survives an outage instead of dying on a 529. But the update everyone missed is a security fix: relayed cross-session messages no longer carry your authority, closing a privilege-escalation path in multi-agent setups. Here's everything that changed and what it unlocks.

Verified against the official Claude Code changelog (v2.1.166, Jun 6 · v2.1.169, Jun 9). Sources in the pinned comment.

00:00 Your agent just died (again)
00:30 Fallback models: 3 backup brains
01:30 Set it up in 30 seconds
02:00 Deny-rule globs: lock down autonomous agents
03:00 The honest catch
03:40 The security hole nobody's talking about
04:40 --safe-mode + /cd
05:10 What this unlocks for you

#ClaudeCode #AIcoding #vibecoding

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