tables_db_list_columns
Retrieve column details from Appwrite database tables to understand table structure, filter by column attributes, and manage data organization.
Instructions
List columns in the table.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| database_id | Yes | Database ID. | |
| table_id | Yes | Table ID. | |
| queries | No | Array of query strings generated using the Query class provided by the SDK. [Learn more about queries](https://appwrite.io/docs/queries). Maximum of 100 queries are allowed, each 4096 characters long. You may filter on the following columns: key, type, size, required, array, status, error |
Implementation Reference
- src/mcp_server_appwrite/server.py:71-71 (registration)Explicit registration of the TablesDB service with name 'tables_db' (via --tables-db CLI flag). This service dynamically generates MCP tools prefixed with 'tables_db_', including 'tables_db_list_columns' from the underlying TablesDB.list_columns method.tools_manager.register_service(Service(TablesDB(client), "tables_db"))
- src/mcp_server_appwrite/server.py:91-94 (registration)Default registration of the TablesDB service with name 'tables_db' if no CLI flags for other services are provided.# If no services were specified, enable tables_db by default if not any([args.databases, args.tables_db, args.users, args.teams, args.storage, args.functions, args.messaging, args.locale, args.avatars, args.sites]): tools_manager.register_service(Service(TablesDB(client), "tables_db"))
- The MCP server tool execution handler. For 'tables_db_list_columns', it retrieves the bound TablesDB.list_columns method from the registry and invokes it with the provided arguments, handling Appwrite-specific exceptions and formatting the result as text content.@server.call_tool() async def handle_call_tool( name: str, arguments: dict | None ) -> list[types.TextContent | types.ImageContent | types.EmbeddedResource]: try: tool_info = tools_manager.get_tool(name) if not tool_info: raise McpError(f"Tool {name} not found") bound_method = tool_info["function"] result = bound_method(**(arguments or {})) if hasattr(result, 'to_dict'): result_dict = result.to_dict() return [types.TextContent(type="text", text=str(result_dict))] return [types.TextContent(type="text", text=str(result))] except AppwriteException as e: return [types.TextContent(type="text", text=f"Appwrite Error: {str(e)}")] except Exception as e: return [types.TextContent(type="text", text=f"Error: {str(e)}")]
- Dynamic tool schema and definition generation for service methods. For TablesDB.list_columns, it inspects the method signature/type hints/docstring to build the JSON schema inputSchema, sets name to 'tables_db_list_columns', and stores the bound function for execution.def list_tools(self) -> Dict[str, Dict]: """Lists all available tools for this service""" tools = {} for name, func in inspect.getmembers(self.service, predicate=inspect.ismethod): if name.startswith('_'): # Skip private methods continue original_func = func.__func__ # Skip if not from the service's module if original_func.__module__ != self.service.__class__.__module__: continue # Get the overridden name if it exists tool_name = self._method_name_overrides.get(name, f"{self.service_name}_{name}") docstring = parse(original_func.__doc__) signature = inspect.signature(original_func) type_hints = get_type_hints(original_func) properties = {} required = [] for param_name, param in signature.parameters.items(): if param_name == 'self': continue param_type = type_hints.get(param_name, str) properties[param_name] = self.python_type_to_json_schema(param_type) properties[param_name]["description"] = f"Parameter '{param_name}'" for doc_param in docstring.params: if doc_param.arg_name == param_name: properties[param_name]["description"] = doc_param.description if param.default is param.empty: required.append(param_name) tool_definition = Tool( name=tool_name, description=f"{docstring.short_description or "No description available"}", inputSchema={ "type": "object", "properties": properties, "required": required } ) tools[tool_name] = { "definition": tool_definition, "function": func } return tools