Function formatToolError

backend/api/mcp/tool_query.go:143–156

formatToolError converts an error into an MCP error result. If the error is a *toolError, it returns structured JSON with code/message/suggestion. Otherwise, it returns the error message as plain text.

(err error)

// If the error is a *toolError, it returns structured JSON with code/message/suggestion.
// Otherwise, it returns the error message as plain text.
func formatToolError(err error) *mcp.CallToolResult {
	var te *toolError
	if errors.As(err, &te) {
		jsonBytes, _ := json.MarshalIndent(te, "", "  ")
		return &mcp.CallToolResult{
			Content: []mcp.Content{&mcp.TextContent{Text: string(jsonBytes)}},
			IsError: true,
		}
	}
	return &mcp.CallToolResult{
		Content: []mcp.Content{&mcp.TextContent{Text: err.Error()}},
		IsError: true,
	}
}

// queryResponse is the typed response from the SQL Query API.
type queryResponse struct {