According to Anthropic auto mode uses an LLM to decide whether to approve each action. nah uses primarily a deterministic classifier that runs fast with zero tokens + optional LLM for the ambiguous stuff.

Auto-mode will likely release tomorrow, so we won't know until then. They could end up being complementary where nah's primary classifier can act as a fast safety net underneath auto mode's judgment.

The permission flow in Claude Code is roughly:

1. Claude decides to use a tool 2. Pre tool hooks fire (synchronously) 3. Permission system checks if user approval is needed 4. If yes then prompt user 5. Tool executes

The most logical design for auto mode is replacing step. Instead of prompting the user, prompt a Claude to auto-approve. If they do it that way, nah fires before auto mode even sees the action. They'd be perfectly complementary.

But they could also implement auto mode like --dangerously-skip-permissions under the hood which fire hooks async.

If I were Anthropic I'd keep hooks synchronous in auto mode since the point is augmenting security and letting hooks fire first is free safety.