Add vercel ai gateway provider docs (#318)

* vercel ai gateway docs

* fix formatting

* Update Vercel AI Gateway documentation

---------

Co-authored-by: Hannes Rudolph <[email protected]>

Author: joshualipman123

docs/providers/vercel-ai-gateway.md

@@ -0,0 +1,75 @@
+---
+description: Configure the Vercel AI Gateway in Roo Code to robustly access 100+ language models from various providers through a centralized interface.
+keywords:
+  - roo code
+  - vercel ai gateway
+  - ai provider
+  - language models
+  - api configuration
+  - model selection
+  - prompt caching
+  - usage tracking
+  - byok
+sidebar_label: Vercel AI Gateway
+image: /img/social-share.jpg
+---
+
+# Using Vercel AI Gateway With Roo Code
+
+The AI Gateway provides a unified API to access hundreds of models through a single endpoint. It gives you the ability to set budgets, monitor usage, load-balance requests, and manage fallbacks.
+
+Useful links:
+- Team dashboard: https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai
+- Models catalog: https://vercel.com/ai-gateway/models
+- Docs: https://vercel.com/docs/ai-gateway
+
+---
+
+## Getting an API Key
+
+An API key is required for authentication.
+
+1.  **Sign Up/Sign In:** Go to the [Vercel Website](https://vercel.com/) and sign in.
+2.  **Get an API Key:** Go to the [API Key page](https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%2Fapi-keys&title=AI+Gateway+API+Key) in the AI Gateway tab. Create a new key.
+3.  **Copy the Key:** Copy the API key.
+
+---
+
+## Supported Models
+
+The Vercel AI Gateway supports a large and growing number of models. Roo Code automatically fetches the list of available models from the `https://ai-gateway.vercel.sh/v1/models` endpoint. Only language models are shown.
+
+The default model is `anthropic/claude-sonnet-4` if no model is selected.
+
+Refer to the [Vercel AI Gateway Models page](https://vercel.com/ai-gateway/models) for the complete and up-to-date list.
+
+### Model Capabilities
+
+- **Vision Support**: Many models support image inputs.
+- **Tool/Computer Use**: Select models support function calling and computer use.
+
+Check the model description in the dropdown for specific capabilities.
+
+---
+
+## Configuration in Roo Code
+
+1.  **Open Roo Code Settings:** Click the gear icon (<Codicon name="gear" />) in the Roo Code panel.
+2.  **Select Provider:** Choose "Vercel AI Gateway" from the "API Provider" dropdown.
+3.  **Enter API Key:** Paste your Vercel AI Gateway API key into the "Vercel AI Gateway API Key" field.
+4.  **Select Model:** Choose your desired model from the "Model" dropdown.
+
+---
+
+## Prompt Caching
+Vercel AI Gateway supports automatic prompt caching for select models including Anthropic Claude and OpenAI GPT models. This reduces costs by caching frequently used prompts.
+
+---
+
+## Tips and Notes
+
+* **Model Selection:** The Vercel AI Gateway offers a wide range of models. Experiment to find the best one for your needs.
+* **Pricing:** The Vercel AI Gateway charges based on the underlying model's pricing, including costs for cached prompts. See the [Vercel AI Gateway Models page](https://vercel.com/ai-gateway/models) for details.
+* **Temperature:** The default temperature is `0.7` and is configurable per model.
+* **Bring Your Own Key (BYOK):** The Vercel AI Gateway has **no markup** if you decide to use your own key for the underlying service.
+* **More info:** Vercel does not add rate limits. Upstream providers may. New accounts receive $5 credits every 30 days until the first payment.

sidebars.ts

@@ -182,6 +182,7 @@ const sidebars: SidebarsConfig = {
         'providers/roo-code-cloud',
         'providers/sambanova',
         'providers/unbound',
+        'providers/vercel-ai-gateway',
         'providers/vertex',
         'providers/vscode-lm',
         'providers/xai',