StarRocks Official MCP Server

The StarRocks MCP Server acts as a bridge between AI assistants and StarRocks databases. It allows for direct SQL execution, database exploration, data visualization via charts, and retrieving detailed schema/data overviews without requiring complex client-side setup.

Features

• Direct SQL Execution: Run SELECT queries (read_query) and DDL/DML commands (write_query).
• Database Exploration: List databases and tables, retrieve table schemas (starrocks:// resources).
• System Information: Access internal StarRocks metrics and states via the proc:// resource path.
• Detailed Overviews: Get comprehensive summaries of tables (table_overview) or entire databases (db_overview), including column definitions, row counts, and sample data.
• Data Visualization: Execute a query and generate a Plotly chart directly from the results (query_and_plotly_chart).
• Intelligent Caching: Table and database overviews are cached in memory to speed up repeated requests. Cache can be bypassed when needed.
• Flexible Configuration: Set connection details and behavior via environment variables.

Configuration

The MCP server is typically run via an MCP host. Configuration is passed to the host, specifying how to launch the StarRocks MCP server process.

Using uv with installed package:

{
  "mcpServers": {
    "mcp-server-starrocks": {
      "command": "uv",
      "args": ["run", "--with", "mcp-server-starrocks", "mcp-server-starrocks"],
      "env": {
        "STARROCKS_HOST": "default localhost",
        "STARROCKS_PORT": "default 9030",
        "STARROCKS_USER": "default root",
        "STARROCKS_PASSWORD": "default empty",
        "STARROCKS_DB": "default empty",
        "STARROCKS_OVERVIEW_LIMIT": "default 20000",
        "STARROCKS_MYSQL_AUTH_PLUGIN":"mysql_clear_password"
      }
    }
  }
}

Using uv with local directory (for development):

{
  "mcpServers": {
    "mcp-server-starrocks": {
      "command": "uv",
      "args": [
        "--directory",
        "path/to/mcp-server-starrocks", //  **Note:**
> The `sse` (Server-Sent Events) mode is deprecated and no longer maintained. Please use Streamable HTTP mode for all new integrations.

**Environment Variables:**

- `STARROCKS_HOST`: (Optional) Hostname or IP address of the StarRocks FE service. Defaults to `localhost`.
- `STARROCKS_PORT`: (Optional) MySQL protocol port of the StarRocks FE service. Defaults to `9030`.
- `STARROCKS_USER`: (Optional) StarRocks username. Defaults to `root`.
- `STARROCKS_PASSWORD`: (Optional) StarRocks password. Defaults to empty string.
- `STARROCKS_DB`: (Optional) Default database to use if not specified in tool arguments or resource URIs. If set, the connection will attempt to `USE` this database. Tools like `table_overview` and `db_overview` will use this if the database part is omitted in their arguments. Defaults to empty (no default database).
- `STARROCKS_OVERVIEW_LIMIT`: (Optional) An _approximate_ character limit for the _total_ text generated by overview tools (`table_overview`, `db_overview`) when fetching data to populate the cache. This helps prevent excessive memory usage for very large schemas or numerous tables. Defaults to `20000`.
- `STARROCKS_MYSQL_AUTH_PLUGIN`: (Optional) Specifies the authentication plugin to use when connecting to the StarRocks FE service. For example, set to `mysql_clear_password` if your StarRocks deployment requires clear text password authentication (such as when using certain LDAP or external authentication setups). Only set this if your environment specifically requires it; otherwise, the default auth_plugin is used.
- `MCP_TRANSPORT_MODE`: (Optional) Communication mode that specifies how the MCP Server exposes its services. Available options:
  - `stdio` (default): Communicates through standard input/output, suitable for MCP Host hosting.
  - `streamable-http` (Streamable HTTP): Starts as a Streamable HTTP Server, supporting RESTful API calls.
  - `sse`: **(Deprecated, not recommended)** Starts in Server-Sent Events (SSE) streaming mode, suitable for scenarios requiring streaming responses. **Note: SSE mode is no longer maintained, it is recommended to use Streamable HTTP mode uniformly.**

## Components

### Tools

- `read_query`

  - **Description:** Execute a SELECT query or other commands that return a ResultSet (e.g., `SHOW`, `DESCRIBE`).
  - **Input:** `{ "query": "SQL query string" }`
  - **Output:** Text content containing the query results in a CSV-like format, including a header row and a row count summary. Returns an error message on failure.

- `write_query`

  - **Description:** Execute a DDL (`CREATE`, `ALTER`, `DROP`), DML (`INSERT`, `UPDATE`, `DELETE`), or other StarRocks command that does not return a ResultSet.
  - **Input:** `{ "query": "SQL command string" }`
  - **Output:** Text content confirming success (e.g., "Query OK, X rows affected") or reporting an error. Changes are committed automatically on success.

- `query_and_plotly_chart`

  - **Description:** Executes a SQL query, loads the results into a Pandas DataFrame, and generates a Plotly chart using a provided Python expression. Designed for visualization in supporting UIs.
  - **Input:**
    ```json
    {
      "query": "SQL query to fetch data",
      "plotly_expr": "Python expression string using 'px' (Plotly Express) and 'df' (DataFrame). Example: 'px.scatter(df, x=\"col1\", y=\"col2\")'"
    }
    ```
  - **Output:** A list containing:
    1.  `TextContent`: A text representation of the DataFrame and a note that the chart is for UI display.
    2.  `ImageContent`: The generated Plotly chart encoded as a base64 PNG image (`image/png`). Returns text error message on failure or if the query yields no data.

- `table_overview`

  - **Description:** Get an overview of a specific table: columns (from `DESCRIBE`), total row count, and sample rows (`LIMIT 3`). Uses an in-memory cache unless `refresh` is true.
  - **Input:**
    ```json
    {
      "table": "Table name, optionally prefixed with database name (e.g., 'db_name.table_name' or 'table_name'). If database is omitted, uses STARROCKS_DB environment variable if set.",
      "refresh": false // Optional, boolean. Set to true to bypass the cache. Defaults to false.
    }
    ```
  - **Output:** Text content containing the formatted overview (columns, row count, sample data) or an error message. Cached results include previous errors if applicable.

- `db_overview`
  - **Description:** Get an overview (columns, row count, sample rows) for _all_ tables within a specified database. Uses the table-level cache for each table unless `refresh` is true.
  - **Input:**
    ```json
    {
      "db": "database_name", // Optional if STARROCKS_DB env var is set.
      "refresh": false // Optional, boolean. Set to true to bypass the cache for all tables in the DB. Defaults to false.
    }
    ```
  - **Output:** Text content containing concatenated overviews for all tables found in the database, separated by headers. Returns an error message if the database cannot be accessed or contains no tables.

### Resources

#### Direct Resources

- `starrocks:///databases`
  - **Description:** Lists all databases accessible to the configured user.
  - **Equivalent Query:** `SHOW DATABASES`
  - **MIME Type:** `text/plain`

#### Resource Templates

- `starrocks:///{db}/{table}/schema`

  - **Description:** Gets the schema definition of a specific table.
  - **Equivalent Query:** `SHOW CREATE TABLE {db}.{table}`
  - **MIME Type:** `text/plain`

- `starrocks:///{db}/tables`

  - **Description:** Lists all tables within a specific database.
  - **Equivalent Query:** `SHOW TABLES FROM {db}`
  - **MIME Type:** `text/plain`

- `proc:///{+path}`
  - **Description:** Accesses StarRocks internal system information, similar to Linux `/proc`. The `path` parameter specifies the desired information node.
  - **Equivalent Query:** `SHOW PROC '/{path}'`
  - **MIME Type:** `text/plain`
  - **Common Paths:**
    - `/frontends` - Information about FE nodes.
    - `/backends` - Information about BE nodes (for non-cloud native deployments).
    - `/compute_nodes` - Information about CN nodes (for cloud native deployments).
    - `/dbs` - Information about databases.
    - `/dbs/` - Information about a specific database by ID.
    - `/dbs//` - Information about a specific table by ID.
    - `/dbs///partitions` - Partition information for a table.
    - `/transactions` - Transaction information grouped by database.
    - `/transactions/` - Transaction information for a specific database ID.
    - `/transactions//running` - Running transactions for a database ID.
    - `/transactions//finished` - Finished transactions for a database ID.
    - `/jobs` - Information about asynchronous jobs (Schema Change, Rollup, etc.).
    - `/statistic` - Statistics for each database.
    - `/tasks` - Information about agent tasks.
    - `/cluster_balance` - Load balance status information.
    - `/routine_loads` - Information about Routine Load jobs.
    - `/colocation_group` - Information about Colocation Join groups.
    - `/catalog` - Information about configured catalogs (e.g., Hive, Iceberg).

### Prompts

None defined by this server.

## Caching Behavior

- The `table_overview` and `db_overview` tools utilize an in-memory cache to store the generated overview text.
- The cache key is a tuple of `(database_name, table_name)`.
- When `table_overview` is called, it checks the cache first. If a result exists and the `refresh` parameter is `false` (default), the cached result is returned immediately. Otherwise, it fetches the data from StarRocks, stores it in the cache, and then returns it.
- When `db_overview` is called, it lists all tables in the database and then attempts to retrieve the overview for _each table_ using the same caching logic as `table_overview` (checking cache first, fetching if needed and `refresh` is `false` or cache miss). If `refresh` is `true` for `db_overview`, it forces a refresh for _all_ tables in that database.
- The `STARROCKS_OVERVIEW_LIMIT` environment variable provides a _soft target_ for the maximum length of the overview string generated _per table_ when populating the cache, helping to manage memory usage.
- Cached results, including any error messages encountered during the original fetch, are stored and returned on subsequent cache hits.

## Demo

![MCP Demo Image](mcpserverdemo.jpg)