docs(google): clarify gemini 3.1 pro alias

docs/concepts/model-providers.md

@@ -195,6 +195,7 @@ Anthropic staff told us OpenClaw-style Claude CLI usage is allowed again, so Ope
 - Optional rotation: `GEMINI_API_KEYS`, `GEMINI_API_KEY_1`, `GEMINI_API_KEY_2`, `GOOGLE_API_KEY` fallback, and `OPENCLAW_LIVE_GEMINI_KEY` (single override)
 - Example models: `google/gemini-3.1-pro-preview`, `google/gemini-3-flash-preview`
 - Compatibility: legacy OpenClaw config using `google/gemini-3.1-flash-preview` is normalized to `google/gemini-3-flash-preview`
+- Alias: `google/gemini-3.1-pro` is accepted and normalized to Google's live Gemini API id, `google/gemini-3.1-pro-preview`
 - CLI: `openclaw onboard --auth-choice gemini-api-key`
 - Thinking: `/think adaptive` uses Google dynamic thinking. Gemini 3/3.1 omit a fixed `thinkingLevel`; Gemini 2.5 sends `thinkingBudget: -1`.
 - Direct Gemini runs also accept `agents.defaults.models["google/<model>"].params.cachedContent` (or legacy `cached_content`) to forward a provider-native `cachedContents/...` handle; Gemini cache hits surface as OpenClaw `cacheRead`

docs/providers/google.md

@@ -102,6 +102,8 @@ Choose your preferred auth method and follow the setup steps.
     - Runtime: `google-gemini-cli`
     - Alias: `gemini-cli`
 
+    Gemini 3.1 Pro's Gemini API model id is `gemini-3.1-pro-preview`. OpenClaw accepts the shorter `google/gemini-3.1-pro` as a convenience alias and normalizes it before provider calls.
+
     **Environment variables:**
 
     - `OPENCLAW_GEMINI_OAUTH_CLIENT_ID`