mcp-snowflake-server-readonly 0.4.6
A simple Snowflake MCP server
Requires Python: <3.13,>=3.10


# Snowflake MCP Server

Slightly altered from https://github.com/isaacwasserman/mcp-snowflake-server

---

## Overview
A Model Context Protocol (MCP) server implementation that provides database interaction with Snowflake. This server enables running SQL queries via tools and exposes data insights and schema context as resources. Does not include the ability to execute write operations, and includes a system prompt.

---

## Components

### Resources

- **`memo://insights`**  
  A continuously updated memo aggregating discovered data insights.  
  Updated automatically when new insights are appended via the `append_insight` tool.

- **`context://table/{table_name}`**  
  (If prefetch enabled) Per-table schema summaries, including columns and comments, exposed as individual resources.

---

### Tools

The server exposes the following tools:

#### Query Tools

- **`read_query`**  
  Execute `SELECT` queries to read data from the database.  
  **Input:**  
  - `query` (string): The `SELECT` SQL query to execute  
  **Returns:** Query results as array of objects

#### Schema Tools

- **`list_databases`**  
  List all databases in the Snowflake instance.  
  **Returns:** Array of database names

- **`list_schemas`**  
  List all schemas within a specific database.  
  **Input:**  
  - `database` (string): Name of the database  
  **Returns:** Array of schema names

- **`list_tables`**  
  List all tables within a specific database and schema.  
  **Input:**  
  - `database` (string): Name of the database  
  - `schema` (string): Name of the schema  
  **Returns:** Array of table metadata

- **`describe_table`**  
  View column information for a specific table.  
  **Input:**  
  - `table_name` (string): Fully qualified table name (`database.schema.table`)  
  **Returns:** Array of column definitions with names, types, nullability, defaults, and comments

#### Analysis Tools

- **`append_insight`**  
  Add new data insights to the memo resource.  
  **Input:**  
  - `insight` (string): Data insight discovered from analysis  
  **Returns:** Confirmation of insight addition  
  **Effect:** Triggers update of `memo://insights` resource

---

## Usage with Claude Desktop

### Installing via UVX

```json
"mcpServers": {
  "snowflake_pip": {
    "command": "uvx",
    "args": [
      "--python=3.12",  // Optional: specify Python version <=3.12
      "mcp_snowflake_server",
      "--account", "your_account",
      "--warehouse", "your_warehouse",
      "--user", "your_user",
      "--password", "your_password",
      "--role", "your_role",
      "--database", "your_database",
      "--schema", "your_schema"
      // Optionally: "--log_dir", "/absolute/path/to/logs"
      // Optionally: "--log_level", "DEBUG"/"INFO"/"WARNING"/"ERROR"/"CRITICAL"
      // Optionally: "--exclude_tools", "{tool_name}", ["{other_tool_name}"]
    ]
  }
}
```

---

### Installing Locally

1. Install [Claude AI Desktop App](https://claude.ai/download)

2. Install `uv`:

```bash
curl -LsSf https://astral.sh/uv/install.sh | sh
```

3. Create a `.env` file with your Snowflake credentials:

```bash
SNOWFLAKE_USER="xxx@your_email.com"
SNOWFLAKE_ACCOUNT="xxx"
SNOWFLAKE_ROLE="xxx"
SNOWFLAKE_DATABASE="xxx"
SNOWFLAKE_SCHEMA="xxx"
SNOWFLAKE_WAREHOUSE="xxx"
SNOWFLAKE_PASSWORD="xxx"
# Alternatively, use external browser authentication:
# SNOWFLAKE_AUTHENTICATOR="externalbrowser"
```

4. [Optional] Modify `runtime_config.json` to set exclusion patterns for databases, schemas, or tables.

5. Test locally:

```bash
uv --directory /absolute/path/to/mcp_snowflake_server run mcp_snowflake_server
```

6. Add the server to your `claude_desktop_config.json`:

```json
"mcpServers": {
  "snowflake_local": {
    "command": "/absolute/path/to/uv",
    "args": [
      "--python=3.12",  // Optional
      "--directory", "/absolute/path/to/mcp_snowflake_server",
      "run", "mcp_snowflake_server"
      // Optionally: "--log_dir", "/absolute/path/to/logs"
      // Optionally: "--log_level", "DEBUG"/"INFO"/"WARNING"/"ERROR"/"CRITICAL"
      // Optionally: "--exclude_tools", "{tool_name}", ["{other_tool_name}"]
    ]
  }
}
```

---

## Notes
- The server supports filtering out specific databases, schemas, or tables via exclusion patterns.
- The server exposes additional per-table context resources if prefetching is enabled.
- The `append_insight` tool updates the `memo://insights` resource dynamically.

---

## License

MIT