feat: add Gemini CLI extension support

Author: vchomakov

GEMINI.md

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+# Redis MCP Server Extension
+
+This extension provides a natural language interface for managing and searching data in Redis through the Model Context Protocol (MCP).
+
+## What this extension provides
+
+The Redis MCP Server enables AI agents to efficiently interact with Redis databases using natural language commands. You can:
+
+- **Store and retrieve data**: Cache items, store session data, manage configuration values
+- **Work with data structures**: Manage hashes, lists, sets, sorted sets, and streams
+- **Search and filter**: Perform efficient data retrieval and searching operations
+- **Pub/Sub messaging**: Publish and subscribe to real-time message channels
+- **JSON operations**: Store, retrieve, and manipulate JSON documents
+- **Vector search**: Manage vector indexes and perform similarity searches
+
+## Available Tools
+
+### String Operations
+- Set, get, and manage string values with optional expiration
+- Useful for caching, session data, and simple configuration
+
+### Hash Operations  
+- Store field-value pairs within a single key
+- Support for vector embeddings storage
+- Ideal for user profiles, product information, and structured objects
+
+### List Operations
+- Append, pop, and manage list items
+- Perfect for queues, message brokers, and activity logs
+
+### Set Operations
+- Add, remove, and list unique set members
+- Perform set operations like intersection and union
+- Great for tracking unique values and tags
+
+### Sorted Set Operations
+- Manage score-based ordered data
+- Ideal for leaderboards, priority queues, and time-based analytics
+
+### Pub/Sub Operations
+- Publish messages to channels and subscribe to receive them
+- Real-time notifications and chat applications
+
+### Stream Operations
+- Add, read, and delete from data streams
+- Event sourcing, activity feeds, and sensor data logging
+
+### JSON Operations
+- Store, retrieve, and manipulate JSON documents
+- Complex nested data structures with path-based access
+
+### Vector Search
+- Manage vector indexes and perform similarity searches
+- AI/ML applications and semantic search
+
+### Server Management
+- Retrieve database information and statistics
+- Monitor Redis server status and performance
+
+## Usage Examples
+
+You can interact with Redis using natural language:
+
+- "Store this user session data with a 1-hour expiration"
+- "Add this item to the shopping cart list"
+- "Search for similar vectors in the product embeddings"
+- "Publish a notification to the alerts channel"
+- "Get the top 10 scores from the leaderboard"
+- "Cache this API response for 5 minutes"
+
+## Configuration
+
+The extension connects to Redis using a Redis URL. Default configuration connects to `redis://127.0.0.1:6379/0`.
+
+### Primary Configuration: Redis URL
+
+Set the `REDIS_URL` environment variable to configure your Redis connection:
+
+```bash
+export REDIS_URL=redis://[username:password@]host:port/database
+```
+
+### Configuration Examples
+
+**Local Redis (no authentication):**
+```bash
+export REDIS_URL=redis://127.0.0.1:6379/0
+# or
+export REDIS_URL=redis://localhost:6379/0
+```
+
+**Redis with password:**
+```bash
+export REDIS_URL=redis://:mypassword@localhost:6379/0
+```
+
+**Redis with username and password:**
+```bash
+export REDIS_URL=redis://myuser:mypassword@localhost:6379/0
+```
+
+**Redis Cloud:**
+```bash
+export REDIS_URL=redis://default:[email protected]:12345/0
+```
+
+**Redis with SSL:**
+```bash
+export REDIS_URL=rediss://user:[email protected]:6380/0
+```
+
+**Redis with SSL and certificates:**
+```bash
+export REDIS_URL=rediss://user:pass@host:6380/0?ssl_cert_reqs=required&ssl_ca_certs=/path/to/ca.pem
+```
+
+**AWS ElastiCache:**
+```bash
+export REDIS_URL=redis://my-cluster.abc123.cache.amazonaws.com:6379/0
+```
+
+**Azure Cache for Redis:**
+```bash
+export REDIS_URL=rediss://mycache.redis.cache.windows.net:6380/0?ssl_cert_reqs=required
+```
+
+### Backward Compatibility: Individual Environment Variables
+
+If `REDIS_URL` is not set, the extension will fall back to individual environment variables:
+
+- `REDIS_HOST` - Redis hostname (default: 127.0.0.1)
+- `REDIS_PORT` - Redis port (default: 6379)
+- `REDIS_DB` - Database number (default: 0)
+- `REDIS_USERNAME` - Redis username (optional)
+- `REDIS_PWD` - Redis password (optional)
+- `REDIS_SSL` - Enable SSL: "true" or "false" (default: false)
+- `REDIS_SSL_CA_PATH` - Path to CA certificate file
+- `REDIS_SSL_KEYFILE` - Path to SSL key file
+- `REDIS_SSL_CERTFILE` - Path to SSL certificate file
+- `REDIS_SSL_CERT_REQS` - SSL certificate requirements (default: "required")
+- `REDIS_SSL_CA_CERTS` - Path to CA certificates file
+- `REDIS_CLUSTER_MODE` - Enable cluster mode: "true" or "false" (default: false)
+
+**Example using individual variables:**
+```bash
+export REDIS_HOST=my-redis-server.com
+export REDIS_PORT=6379
+export REDIS_PWD=mypassword
+export REDIS_SSL=true
+```
+
+### Configuration Priority
+
+1. **`REDIS_URL`** (highest priority) - If set, this will be used exclusively
+2. **Individual environment variables** - Used as fallback when `REDIS_URL` is not set
+3. **Built-in defaults** - Used when no configuration is provided
+
+### Configuration Methods
+
+1. **Environment Variables**: Set variables in your shell or system
+2. **`.env` File**: Create a `.env` file in your project directory
+3. **System Environment**: Set variables at the system level
+4. **Shell Profile**: Add exports to your `.bashrc`, `.zshrc`, etc.
+
+### No Configuration Required
+
+If you don't set any configuration, the extension will automatically connect to a local Redis instance at `redis://127.0.0.1:6379/0`.
+
+### Advanced SSL Configuration
+
+For production environments with custom SSL certificates, you can use query parameters in the Redis URL:
+
+```bash
+export REDIS_URL=rediss://user:pass@host:6380/0?ssl_cert_reqs=required&ssl_ca_path=/path/to/ca.pem&ssl_keyfile=/path/to/key.pem&ssl_certfile=/path/to/cert.pem
+```
+
+Supported SSL query parameters:
+- `ssl_cert_reqs` - Certificate requirements: "required", "optional", "none"
+- `ssl_ca_certs` - Path to CA certificates file
+- `ssl_ca_path` - Path to CA certificate file
+- `ssl_keyfile` - Path to SSL private key file
+- `ssl_certfile` - Path to SSL certificate file
+
+For detailed configuration options and Redis URL format, see the main Redis MCP Server documentation.

gemini-extension.json

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+{
+  "name": "mcp-redis",
+  "version": "0.1.0",
+  "mcpServers": {
+    "redis": {
+      "command": "uvx",
+      "args": [
+        "--from",
+        "redis-mcp-server@latest",
+        "redis-mcp-server",
+        "--url", "${REDIS_URL}"
+      ]
+    }
+  }
+}