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3aa1a41e88
Google AI Studio's free tier (<= 250 req/day for gemini-2.5-flash) is exhausted in a handful of agent turns, so the setup wizard now refuses to wire up Gemini when the supplied key is on the free tier, and the runtime 429 handler appends actionable billing guidance. Setup-time probe (hermes_cli/main.py): - `_model_flow_api_key_provider` fires one minimal generateContent call when provider_id == 'gemini' and classifies the response as free/paid/unknown via x-ratelimit-limit-requests-per-day header or 429 body containing 'free_tier'. - Free -> print block message, refuse to save the provider, return. - Paid -> 'Tier check: paid' and proceed. - Unknown (network/auth error) -> 'could not verify', proceed anyway. Runtime 429 handler (agent/gemini_native_adapter.py): - `gemini_http_error` appends billing guidance when the 429 error body mentions 'free_tier', catching users who bypass setup by putting GOOGLE_API_KEY directly in .env. Tests: 21 unit tests for the probe + error path, 4 tests for the setup-flow block. All 67 existing gemini tests still pass.