Google has added a plan mode to Gemini CLI, its open-source command-line AI coding agent. Plan mode restricts the agent to read-only tools (read_file, grep_search, glob) so it can analyze codebases, map dependencies, and propose strategies without risk of accidental file modifications. It is enabled by default and can be activated via /plan, Shift+Tab, or by asking the agent to 'start a plan.' A new ask_user tool lets the agent pause and ask clarifying questions before proposing a solution.
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