From the source

Through the Agent, Into the Shell

Capability change

Amp CLI introduced shell mode, allowing users to execute shell commands directly in the prompt input by starting a message with $.

Commands and their output are included in the context window for the agent.

An incognito mode ($$) executes commands without including them in the context.

From the source
Finally: the Amp CLI now also lets you execute shell commands, right there in the prompt input.
ampcode.com

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