list_schemas
Retrieve all schema names from a specified Snowflake database to explore database structure and organize data objects.
Instructions
List all schemas in a database
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| database | Yes | Database name to list schemas from |
Implementation Reference
- Core handler function that executes the logic to list schemas from a specified Snowflake database. It runs a SQL query, applies exclusion filters if configured, formats results as YAML and JSON, and returns them as TextContent and EmbeddedResource.
async def handle_list_schemas(arguments, db, *_, exclusion_config=None): if not arguments or "database" not in arguments: raise ValueError("Missing required 'database' parameter") database = arguments["database"] query = f"SELECT SCHEMA_NAME FROM {database.upper()}.INFORMATION_SCHEMA.SCHEMATA" data, data_id = await db.execute_query(query) # Filter out excluded schemas if exclusion_config and "schemas" in exclusion_config and exclusion_config["schemas"]: filtered_data = [] for item in data: schema_name = item.get("SCHEMA_NAME", "") exclude = False for pattern in exclusion_config["schemas"]: if pattern.lower() in schema_name.lower(): exclude = True break if not exclude: filtered_data.append(item) data = filtered_data output = { "type": "data", "data_id": data_id, "database": database, "data": data, } yaml_output = data_to_yaml(output) json_output = json.dumps(output) return [ types.TextContent(type="text", text=yaml_output), types.EmbeddedResource( type="resource", resource=types.TextResourceContents(uri=f"data://{data_id}", text=json_output, mimeType="application/json"), ), ] - Input schema validation for the tool, requiring a single 'database' string parameter.
input_schema={ "type": "object", "properties": { "database": { "type": "string", "description": "Database name to list schemas from", }, }, "required": ["database"], }, - src/mcp_snowflake_server/server.py:436-450 (registration)Registers the 'list_schemas' tool in the all_tools list, which is used by handle_list_tools() to expose the tool to MCP clients and by handle_call_tool() to dispatch calls to the handler.
Tool( name="list_schemas", description="List all schemas in a database", input_schema={ "type": "object", "properties": { "database": { "type": "string", "description": "Database name to list schemas from", }, }, "required": ["database"], }, handler=handle_list_schemas, ),