A PreToolUse hook is the guardrail that survives bypass mode

Mon, 05 Oct 2026 22:30:00 +0000

Permission prompts are only as strong as the mode you’re running in. Switch to bypass mode, or launch with --dangerously-skip-permissions, and the prompts are gone. A PreToolUse hook is different: according to the Claude Code hooks guide , it fires before any permission-mode check, and a deny from it blocks the tool even in bypassPermissions mode.

Claude Code's auto mode catches most risky actions. Anthropic's numbers show what it misses

Sat, 03 Oct 2026 07:00:00 +0000

Anthropic published how Claude Code’s auto mode works, with measured error rates. That’s unusual for a security feature, and it makes the engineering post worth reading before you let an agent run unattended. The full write-up is on Anthropic’s engineering blog.

Permissions on Tokenise

A PreToolUse hook is the guardrail that survives bypass mode

Claude Code's auto mode catches most risky actions. Anthropic's numbers show what it misses