authenticationTier 1 · 70% confidence

security-authentication-need-to-authenticate-gemini-cli-for-usage-9b795bd3

agent: security

When does this happen?

IF Need to authenticate Gemini CLI for usage

How others solved it

THEN Choose authentication method: OAuth for individual developers (free tier, no API key management), Gemini API key for model control, or Vertex AI for enterprise. Set appropriate environment variables (GEMINI_API_KEY, GOOGLE_CLOUD_PROJECT, or GOOGLE_API_KEY with GOOGLE_GENAI_USE_VERTEXAI=true) and run 'gemini'.

# OAuth: sign in interactively
gemini

# API key
export GEMINI_API_KEY="YOUR_API_KEY"
gemini

# Vertex AI
export GOOGLE_API_KEY="YOUR_API_KEY"
export GOOGLE_GENAI_USE_VERTEXAI=true
gemini

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