Add OPENAI_INTEGRATION.md

OPENAI_INTEGRATION.md

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+# OpenAI-Compatible Integration for MCP Gateway
+
+This guide shows how to add OpenAI-compatible endpoints to your MCP Gateway so Open-UI and other OpenAI clients can use your MCP tools.
+
+## Quick Setup (2 steps)
+
+### Step 1: Import the OpenAI routes in `gateway-proxy/gateway_proxy.py`
+
+At the top of the file, add:
+
+```python
+from openai_routes import chat_completions, list_models
+```
+
+### Step 2: Add the routes to your Starlette app
+
+In the `app = Starlette(routes=[...])` section, add these routes before the closing bracket:
+
+```python
+        # OpenAI-compatible endpoints
+        Route("/v1/models", list_models, methods=["GET"]),
+        Route("/v1/chat/completions", chat_completions, methods=["POST"]),
+```
+
+So your routes section should look like:
+
+```python
+app = Starlette(
+    routes=[
+        # Well-known discovery (Claude tries both with and without /mcp suffix)
+        Route("/.well-known/oauth-protected-resource", well_known_protected_resource, methods=["GET"]),
+        Route("/.well-known/oauth-protected-resource/mcp", well_known_protected_resource, methods=["GET"]),
+        Route("/.well-known/oauth-authorization-server", well_known_oauth_authorization_server, methods=["GET"]),
+        Route("/.well-known/oauth-authorization-server/mcp", well_known_oauth_authorization_server, methods=["GET"]),
+        Route("/.well-known/openid-configuration", well_known_oauth_authorization_server, methods=["GET"]),
+
+        # OAuth endpoints at /oauth/* (spec-standard)
+        Route("/oauth/register", oauth_register, methods=["POST"]),
+        Route("/oauth/authorize", oauth_authorize, methods=["GET", "POST"]),
+        Route("/oauth/token", oauth_token, methods=["POST"]),
+
+        # OAuth endpoints at root (Claude may construct these from base URL)
+        Route("/register", oauth_register, methods=["POST"]),
+        Route("/authorize", oauth_authorize, methods=["GET", "POST"]),
+        Route("/token", oauth_token, methods=["POST"]),
+
+        # MCP endpoint (OAuth-protected)
+        Route("/mcp", handle_mcp, methods=["GET", "HEAD", "POST", "DELETE"]),
+
+        # OpenAI-compatible endpoints
+        Route("/v1/models", list_models, methods=["GET"]),
+        Route("/v1/chat/completions", chat_completions, methods=["POST"]),
+
+        # Monitoring
+        Route("/health", health, methods=["GET"]),
+        Route("/status", status, methods=["GET"]),
+    ],
+    lifespan=lifespan,
+)
+```
+
+## Configuration
+
+Update the route handler to pass required parameters. In `gateway_proxy.py`, modify the route definitions:
+
+```python
+from functools import partial
+
+# Near the top where other routes are defined:
+chat_completions_handler = partial(
+    chat_completions,
+    mcp_gateway_url="http://localhost:4444/mcp",
+    access_tokens=ACCESS_TOKENS
+)
+
+list_models_handler = partial(
+    list_models,
+    gateway_config={"backends": BACKENDS}
+)
+```
+
+Then update the routes:
+
+```python
+        Route("/v1/models", list_models_handler, methods=["GET"]),
+        Route("/v1/chat/completions", chat_completions_handler, methods=["POST"]),
+```
+
+## Using with Open-UI
+
+Once integrated and running:
+
+1. **Gateway URL**: `https://mcp.wilddragon.net` (or your gateway URL)
+2. **API Base URL in Open-UI**: `https://mcp.wilddragon.net/v1`
+3. **Model**: `mcp-gateway`
+4. **Bearer Token**: Use your generated token
+
+### In Open-UI Admin Panel:
+
+1. Go to Admin → Settings → Connections
+2. Scroll to "Direct Connections"
+3. Add new direct connection:
+   - **API Base URL**: `https://mcp.wilddragon.net/v1`
+   - **API Key**: Your bearer token
+
+## API Endpoints
+
+### `GET /v1/models`
+List available models. Returns the MCP Gateway as a model option.
+
+**Example:**
+```bash
+curl -H "Authorization: Bearer YOUR_TOKEN" \
+  https://mcp.wilddragon.net/v1/models
+```
+
+### `POST /v1/chat/completions`
+OpenAI-compatible chat completions endpoint.
+
+**Example:**
+```bash
+curl -X POST \
+  -H "Authorization: Bearer YOUR_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "model": "mcp-gateway",
+    "messages": [
+      {"role": "user", "content": "What tools are available?"}
+    ]
+  }' \
+  https://mcp.wilddragon.net/v1/chat/completions
+```
+
+## What's Currently Supported
+
+✅ **Available tools listing** - Shows all available MCP tools
+✅ **Bearer token authentication** - Uses your existing OAuth tokens
+✅ **Streaming responses** - OpenAI-compatible streaming format
+✅ **Standard OpenAI request/response format**
+
+## Next Steps (Optional Enhancements)
+
+1. **Tool Calling**: Implement actual tool execution via MCP
+2. **System Prompts**: Add custom system prompts for tool use
+3. **Session Management**: Preserve MCP session state across requests
+4. **Error Handling**: More detailed error messages for tool failures
+
+## Troubleshooting
+
+**"Unauthorized" error**: Make sure your bearer token is valid. Check that it's in `ACCESS_TOKENS` on the gateway.
+
+**"No user message found"**: Ensure the request includes at least one message with role `"user"`.
+
+**Tools not showing**: Check that your MCP backends are initialized and responding to `tools/list` requests.
+
+## Files
+
+- `gateway-proxy/openai_routes.py` - OpenAI-compatible route handlers
+- `openai_adapter.py` - Adapter class (optional, for more advanced usage)