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Gemini System Prompt Override (GEMINI_SYSTEM_MD)
Google April 23, 2026
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Documentation for overriding Gemini CLI's default system prompt using GEMINI_SYSTEM_MD environment variable or GEMINI.md files. Allows complete customization of agent behavior and instructions.
Rule Content
Override Gemini CLI system prompt via GEMINI_SYSTEM_MD env var or GEMINI.md file in project root. Supports Markdown format with sections for role definition, constraints, output format, and tool usage instructions.
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