Add standalone LLM provider and client configuration docs

assets/agw-docs/pages/agentgateway/integrations/llm-clients/continue.md

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+# VS Code Continue
+
+Configure [Continue](https://continue.dev/), the open-source AI code assistant for VS Code, to use agentgateway as its LLM backend.
+
+## Overview
+
+Continue is a VS Code extension that provides AI-powered code completion, chat, and refactoring. It supports custom OpenAI-compatible endpoints via its configuration file.
+
+## Before you begin
+
+- agentgateway running and accessible (e.g., `http://localhost:3000`).
+- A configured LLM backend in agentgateway.
+- VS Code with Continue extension installed.
+
+## Installation
+
+1. Install Continue from the VS Code marketplace.
+   - Open VS Code.
+   - Go to Extensions (`Cmd + Shift + X` on macOS, `Ctrl + Shift + X` on Windows/Linux).
+   - Search for "Continue".
+   - Click **Install**.
+
+2. Continue will create a configuration file at `~/.continue/config.json`.
+
+## Configuration
+
+### Basic setup
+
+Edit `~/.continue/config.json` to add your agentgateway endpoint:
+
+```json
+{
+  "models": [
+    {
+      "title": "agentgateway",
+      "provider": "openai",
+      "model": "gpt-4o-mini",
+      "apiBase": "http://localhost:3000/v1",
+      "apiKey": "anything"
+    }
+  ],
+  "tabAutocompleteModel": {
+    "title": "agentgateway Autocomplete",
+    "provider": "openai",
+    "model": "gpt-4o-mini",
+    "apiBase": "http://localhost:3000/v1",
+    "apiKey": "anything"
+  }
+}
+```
+
+### Configuration options
+
+| Field | Description | Example |
+|-------|-------------|---------|
+| `title` | Display name in Continue UI | `"agentgateway"` |
+| `provider` | Provider type (use `"openai"` for compatibility) | `"openai"` |
+| `model` | Model name from your agentgateway backend | `"gpt-4o-mini"` |
+| `apiBase` | agentgateway URL with `/v1` path | `"http://localhost:3000/v1"` |
+| `apiKey` | API key (placeholder if no auth) | `"anything"` |
+
+### Multi-model setup
+
+Configure multiple models for different use cases:
+
+```json
+{
+  "models": [
+    {
+      "title": "GPT-4o via Gateway",
+      "provider": "openai",
+      "model": "gpt-4o-mini",
+      "apiBase": "http://localhost:3000/v1",
+      "apiKey": "anything"
+    },
+    {
+      "title": "Claude via Gateway",
+      "provider": "openai",
+      "model": "claude-sonnet-4-20250514",
+      "apiBase": "http://localhost:3001/v1",
+      "apiKey": "anything"
+    }
+  ],
+  "tabAutocompleteModel": {
+    "title": "GPT-4o Autocomplete",
+    "provider": "openai",
+    "model": "gpt-4o-mini",
+    "apiBase": "http://localhost:3000/v1",
+    "apiKey": "anything"
+  }
+}
+```
+
+Switch between models using the Continue sidebar model selector.
+
+## Features
+
+### Chat
+
+1. Open Continue sidebar (`Cmd + M` on macOS, `Ctrl + M` on Windows/Linux).
+2. Type your question in the chat input.
+3. Continue sends requests to agentgateway.
+
+### Code completion
+
+Continue sends code context to your configured `tabAutocompleteModel` for inline suggestions.
+
+### Slash commands
+
+Use Continue's slash commands with your agentgateway backend:
+- `/edit` - Refactor selected code.
+- `/comment` - Add documentation comments.
+- `/test` - Generate unit tests.
+- `/fix` - Fix code issues.
+
+## Example agentgateway configuration
+
+Here's a gateway configuration optimized for Continue with multiple backends:
+
+```yaml
+# yaml-language-server: $schema=https://agentgateway.dev/schema/config
+binds:
+- port: 3000
+  listeners:
+  - routes:
+    - policies:
+        backendAuth:
+          key: $OPENAI_API_KEY
+      backends:
+      - ai:
+          name: openai-chat
+          provider:
+            openAI:
+              model: gpt-4o-mini
+
+- port: 3001
+  listeners:
+  - routes:
+    - policies:
+        backendAuth:
+          key: $ANTHROPIC_API_KEY
+      backends:
+      - ai:
+          name: anthropic-chat
+          provider:
+            anthropic:
+              model: claude-sonnet-4-20250514
+```
+
+## Environment variables
+
+Continue respects OpenAI environment variables. Set these before launching VS Code:
+
+```bash
+export OPENAI_API_BASE=http://localhost:3000/v1
+export OPENAI_API_KEY=anything
+code .
+```
+
+## Verification
+
+1. Open Continue sidebar in VS Code.
+2. Select your agentgateway model from the model dropdown.
+3. Send a test message: "Hello, are you working?".
+4. Continue should respond via agentgateway.
+
+Check agentgateway logs to confirm requests are being received.
+
+## Troubleshooting
+
+### Connection refused
+
+- Verify agentgateway is running: `curl http://localhost:3000/v1/models`.
+- Check firewall settings.
+- Ensure `apiBase` includes `/v1` path.
+
+### "Model not found" error
+
+- Ensure the `model` field matches your agentgateway backend configuration.
+- Check agentgateway logs for backend errors.
+
+### Slow completions
+
+- Check agentgateway latency in observability metrics.
+- Consider using a faster model for `tabAutocompleteModel`.
+- Adjust Continue's `requestDelay` setting in `config.json`:
+  ```json
+  {
+    "requestDelay": 500
+  }
+  ```
+
+### API key errors
+
+- If agentgateway has no authentication, use any placeholder: `"anything"`.
+- If using `backendAuth`, ensure gateway has valid provider API keys.
+- Check agentgateway logs for auth errors.
+
+## Advanced configuration
+
+### Custom context providers
+
+Continue can send additional context with requests. Configure context providers in `config.json`:
+
+```json
+{
+  "contextProviders": [
+    {
+      "name": "code",
+      "params": {
+        "maxSnippets": 10
+      }
+    },
+    {
+      "name": "file",
+      "params": {}
+    }
+  ]
+}
+```
+
+### Temperature and parameters
+
+Adjust model parameters:
+
+```json
+{
+  "models": [
+    {
+      "title": "agentgateway",
+      "provider": "openai",
+      "model": "gpt-4o-mini",
+      "apiBase": "http://localhost:3000/v1",
+      "apiKey": "anything",
+      "temperature": 0.7,
+      "topP": 0.9,
+      "maxTokens": 2000
+    }
+  ]
+}
+```
+
+## Related documentation
+
+- [Continue Documentation](https://continue.dev/docs)
+- [agentgateway LLM Configuration]({{< link-hextra path="/llm/" >}})
+- [Backend Authentication]({{< link-hextra path="/security/policies/backend-auth/" >}})